Lebreton F, Valentino MD, Schaufler K, Earl AM, Cattoir V, Gilmore MS. Transferable vancomycin resistance in clade B commensal-type Enterococcus faecium. J Antimicrob Chemother 2018;73(6):1479-1486.Abstract
Objectives: Vancomycin-resistant Enterococcus faecium is a leading cause of MDR hospital infection. Two genetically definable populations of E. faecium have been identified: hospital-adapted MDR isolates (clade A) and vancomycin-susceptible commensal strains (clade B). VanN-type vancomycin resistance was identified in two isolates of E. faecium recovered from blood and faeces of an immunocompromised patient. To understand the genomic context in which VanN occurred in the hospitalized patient, the risk it posed for transmission in the hospital and its origins, it was of interest to determine where these strains placed within the E. faecium population structure. Methods: We obtained the genome sequence of the VanN isolates and performed comparative and functional genomics of the chromosome and plasmid content. Results: We show that, in these strains, VanN occurs in a genetic background that clusters with clade B E. faecium, which is highly unusual. We characterized the chromosome and the conjugative plasmid that carries VanN resistance in these strains, pUV24. This plasmid exhibits signatures of in-host selection on the vanN operon regulatory system, which are associated with a constitutive expression of vancomycin resistance. VanN resistance in clade B strains may go undetected by current methods. Conclusions: We report a case of vancomycin resistance in a commensal lineage of E. faecium responsible for an atypical bacteraemia in an immunocompromised patient. A reservoir of transferable glycopeptide resistance in the community could pose a concern for public health.
Lee CS, Lee AY, Akileswaran L, Stroman D, Najafi-Tagol K, Kleiboeker S, Chodosh J, Magaret A, Wald A, Van Gelder RN, Van Gelder RN. Determinants of Outcomes of Adenoviral Keratoconjunctivitis. Ophthalmology 2018;125(9):1344-1353.Abstract
PURPOSE: To determine host and pathogen factors predictive of outcomes in a large clinical cohort with keratoconjunctivitis. DESIGN: Retrospective analyses of the clinical and molecular data from a randomized, controlled, masked trial for auricloscene for keratoconjunctivitis (NVC-422 phase IIB, NovaBay; clinicaltrials.gov identifier, NCT01877694). PARTICIPANTS: Five hundred participants from United States, India, Brazil, and Sri Lanka with clinical diagnosis of keratoconjunctivitis and positive rapid test results for adenovirus. METHODS: Clinical signs and symptoms and bilateral conjunctival swabs were obtained on days 1, 3, 6, 11, and 18. Polymerase chain reaction (PCR) analysis was performed to detect and quantify adenovirus in all samples. Regression models were used to evaluate the association of various variables with keratoconjunctivitis outcomes. Time to resolution of each symptom or sign was assessed by adenoviral species with Cox regression. MAIN OUTCOME MEASURES: The difference in composite scores of clinical signs between days 1 and 18, mean visual acuity change between days 1 and 18, and time to resolution of each symptom or sign. RESULTS: Of 500 participants, 390 (78%) showed evidence of adenovirus by PCR. Among adenovirus-positive participants, adenovirus D species was most common (63% of total cases), but a total of 4 species and 21 different types of adenovirus were detected. Adenovirus D was associated with more severe signs and symptoms, a higher rate of subepithelial infiltrate development, and a slower decline in viral load compared with all other adenovirus species. The clinical courses of all patients with non-adenovirus D species infection and adenovirus-negative keratoconjunctivitis were similar. Mean change in visual acuity between days 1 and 18 was a gain of 1.9 letters; worse visual outcome was associated with older age. CONCLUSIONS: A substantial proportion of keratoconjunctivitis is not associated with a detectable adenovirus. The clinical course of those with adenovirus D keratoconjunctivitis is significantly more severe than those with non-adenovirus D species infections or adenovirus-negative keratoconjunctivitis; high viral load at presentation and non-United States origin of participants is associated with poorer clinical outcome.
Lee SSY, Yazar S, Pasquale LR, Sanfilippo PG, Hewitt AW, Hickey M, Skinner R, Mackey DA. The Relationship Between Optic Disc Parameters and Female Reproductive Factors in Young Women. Asia Pac J Ophthalmol (Phila) 2018;Abstract
PURPOSE: It has been suggested that female sex steroids have neuroprotective properties that may reduce risk of glaucoma in premenopausal women. In this study, we explored the associations of optic disc measures with female reproductive factors in a population of young women. DESIGN: Cohort study. METHODS: Young women (n = 494; age range, 18-22 years) were recruited as part of the Western Australian Pregnancy Cohort (Raine) Study. Information on age at menarche, parity, and use of hormonal contraceptives were obtained from questionnaires. Participants underwent an eye examination, including spectral-domain optical coherence tomography imaging, to obtain optic disc parameters. RESULTS: Women who had given birth at least once (parous women; n = 10) had larger vertical neuroretinal rim widths ( < 0.001) than nulliparous women (n = 484) after correcting for use of hormonal contraceptives, intraocular pressure, refractive error, and family history of glaucoma. Furthermore, vertical and horizontal cup-to-disc ratios, which are inherently related to neuroretinal rim width, were found to be smaller among parous women compared with nulliparous women (both < 0.001). Age at menarche and use of hormonal contraceptives were not significantly associated with any optic disc parameters. CONCLUSIONS: We found limited evidence that female reproductive factors were related with optic disc parameters during young adulthood. The association between parity and optic disc parameter, though significant, should be further investigated given the small number of parous women in the current sample. Future follow-ups of this cohort will allow us to explore for any associations of these factors with optic disc parameters and glaucoma risk at an older age.
Lee A, Karamichos D, Onochie OE, Hutcheon AEK, Rich CB, Zieske JD, Trinkaus-Randall V. Hypoxia modulates the development of a corneal stromal matrix model. Exp Eye Res 2018;170:127-137.Abstract
Deposition of matrix proteins during development and repair is critical to the transparency of the cornea. While many cells respond to a hypoxic state that can occur in a tumor, the cornea is exposed to hypoxia during development prior to eyelid opening and during the diurnal sleep cycle where oxygen levels can drop from 21% to 8%. In this study, we used 2 three-dimensional (3-D) models to examine how stromal cells respond to periods of acute hypoxic states. The first model, a stromal construct model, is a 3-D stroma-like construct that consists of human corneal fibroblasts (HCFs) stimulated by a stable form of ascorbate for 1, 2, and 4 weeks to self-assemble their own extracellular matrix. The second model, a corneal organ culture model, is a corneal wound-healing model, which consists of wounded adult rat corneas that were removed and placed in culture to heal. Both models were exposed to either normoxic or hypoxic conditions for varying time periods, and the expression and/or localization of matrix proteins was assessed. No significant changes were detected in Type V collagen, which is associated with Type I collagen fibrils; however, significant changes were detected in the expression of both the small leucine-rich repeating proteoglycans and the larger heparan sulfate proteoglycan, perlecan. Also, hypoxia decreased both the number of Cuprolinic blue-positive glycosaminoglycan chains along collagen fibrils and Sulfatase 1, which modulates the effect of heparan sulfate by removing the 6-O-sulfate groups. In the stromal construct model, alterations were seen in fibronectin, similar to those that occur in development and after injury. These changes in fibronectin after injury were accompanied by changes in proteoglycans. Together these findings indicate that acute hypoxic changes alter the physiology of the cornea, and these models will allow us to manipulate the conditions in the extracellular environment in order to study corneal development and trauma.
Lee JY, Lee JS, Materne EC, Rajala R, Ismail AM, Seto D, Dyer DW, Rajaiya J, Chodosh J. Bacterial RecA Protein Promotes Adenoviral Recombination during Infection. mSphere 2018;3(3)Abstract
Adenovirus infections in humans are common and sometimes lethal. Adenovirus-derived vectors are also commonly chosen for gene therapy in human clinical trials. We have shown in previous work that homologous recombination between adenoviral genomes of human adenovirus species D (HAdV-D), the largest and fastest growing HAdV species, is responsible for the rapid evolution of this species. Because adenovirus infection initiates in mucosal epithelia, particularly at the gastrointestinal, respiratory, genitourinary, and ocular surfaces, we sought to determine a possible role for mucosal microbiota in adenovirus genome diversity. By analysis of known recombination hot spots across 38 human adenovirus genomes in species D (HAdV-D), we identified nucleotide sequence motifs similar to bacterial Chi sequences, which facilitate homologous recombination in the presence of bacterial Rec enzymes. These motifs, referred to here as Chi, were identified immediately 5' to the sequence encoding penton base hypervariable loop 2, which expresses the arginine-glycine-aspartate moiety critical to adenoviral cellular entry. Coinfection with two HAdV-Ds in the presence of an lysate increased recombination; this was blocked in a RecA mutant strain, DH5α, or upon RecA depletion. Recombination increased in the presence of lysate despite a general reduction in viral replication. RecA colocalized with viral DNA in HAdV-D-infected cell nuclei and was shown to bind specifically to Chi sequences. These results indicate that adenoviruses may repurpose bacterial recombination machinery, a sharing of evolutionary mechanisms across a diverse microbiota, and unique example of viral commensalism. Adenoviruses are common human mucosal pathogens of the gastrointestinal, respiratory, and genitourinary tracts and ocular surface. Here, we report finding Chi-like sequences in adenovirus recombination hot spots. Adenovirus coinfection in the presence of bacterial RecA protein facilitated homologous recombination between viruses. Genetic recombination led to evolution of an important external feature on the adenoviral capsid, namely, the penton base protein hypervariable loop 2, which contains the arginine-glycine-aspartic acid motif critical to viral internalization. We speculate that free Rec proteins present in gastrointestinal secretions upon bacterial cell death facilitate the evolution of human adenoviruses through homologous recombination, an example of viral commensalism and the complexity of virus-host interactions, including regional microbiota.
Lee NG, Habib L, Hall J, Freitag SK. Simultaneous ipsilateral transconjunctival repair of upper and lower eyelid retraction in thyroid-associated ophthalmopathy. Orbit 2018;:1-6.Abstract
PURPOSE: To report a simple, highly effective technique of simultaneous transconjunctival repair of upper and lower eyelid retraction in patients with thyroid eye disease (TED). METHODS: A retrospective interventional case review was conducted on 22 eyes of 19 TED patients. The lower eyelid was recessed with placement of a tarsoconjunctival spacer graft harvested from the upper eyelid. The upper eyelid was then recessed through the conjunctival incision used to harvest the tarsal graft. A temporary tarsorrhaphy was placed for 5-7 days. The postoperative outcome was assessed by measuring the margin reflex distance of the upper eyelid (MRD1), inferior scleral show (ISS), and lagophthalmos. RESULTS: The absolute change in MRD1 ranged from 0 to 5 mm with an average of 1.86 ± 1.34 mm. The absolute change in ISS ranged from 0 to 2 mm with an average of 1.3 ± 0.49 mm. One patient had postoperative lagophthalmos and 17 of 19 had improvement in their ocular surface exposure symptoms. None of the patients' grafts were observed to undergo absorption during the postoperative course. CONCLUSIONS: This technique of harvesting a free tarsoconjunctival graft from the upper eyelid as a posterior spacer for the lower while simultaneously recessing the upper eyelid through the same incision is an effective and durable method of correcting eyelid retraction in TED.
Lefebvre DR, Reinshagen KL, Yoon MK, Stone JH, Stagner AM. Case 39-2018: An 18-Year-Old Man with Diplopia and Proptosis of the Left Eye. N Engl J Med 2018;379(25):2452-2461.
Li W, Webster KA, LeBlanc ME, Tian H. Secretogranin III: a diabetic retinopathy-selective angiogenic factor. Cell Mol Life Sci 2018;75(4):635-647.Abstract
Secretogranin III (Scg3) is a member of the granin protein family that regulates the biogenesis of secretory granules. Scg3 was recently discovered as an angiogenic factor, expanding its functional role to extrinsic regulation. Unlike many other known angiogenic factors, the pro-angiogenic actions of Scg3 are restricted to pathological conditions. Among thousands of quantified endothelial ligands, Scg3 has the highest binding activity ratio to diabetic vs. healthy mouse retinas and lowest background binding to normal vessels. In contrast, vascular endothelial growth factor binds to and stimulates angiogenesis of both diabetic and control vasculature. Consistent with its role in pathological angiogenesis, Scg3-neutralizing antibodies alleviate retinal vascular leakage in mouse models of diabetic retinopathy and retinal neovascularization in oxygen-induced retinopathy mice. This review summarizes our current knowledge of Scg3 as a regulatory protein of secretory granules, highlights its new role as a highly disease-selective angiogenic factor, and envisions Scg3 inhibitors as "selective angiogenesis blockers" for targeted therapy.
Li Z, Cestari DM, Fortin E. Thyroid eye disease: what is new to know?. Curr Opin Ophthalmol 2018;29(6):528-534.Abstract
PURPOSE OF REVIEW: The pathophysiology of thyroid eye disease (TED) is still not fully understood. However, recently described risk factors and molecular findings have brought new insights into the mechanisms of TED and could lead to the emerging use of more targeted therapies. This article aims to review the clinical findings of TED, and the most recent advances in our understanding of the risk factors and therapeutic options for TED. RECENT FINDINGS: Smoking has been recently shown to have an impact on specific gene expression involved in several disease-related pathways, which seems to be reversible with smoking cessation. This finding further emphasizes the importance of smoking cessation in the prevention and treatment of TED. Selenium deficiency and high-serum cholesterol have been described to be potential independent risk factors for TED and their management could decrease the incidence and severity of TED. In terms of therapeutic options, immunomodulatory medications have shown some promising results for disease control in TED over the past years, but further randomized prospective studies with larger sample sizes are still needed to prove their efficacy. A new technique of P brachytherapy was shown to have quick therapeutic effects on TED without significant side effects and could be a promising therapy for selected cases of TED. SUMMARY: TED is one of the most common autoimmune inflammatory disorders of the orbit. Although its pathophysiology remains unclear, newly described genetic findings and risk factors could help in explaining its occurrence and guide future therapies. Immunosuppressant medications are increasingly used in the management of TED, but further studies are needed to confirm their effectiveness.
Lieberman MT, Van Tyne D, Dzink-Fox JA, Ma EJ, Gilmore MS, Fox JG. Long-Term Colonization Dynamics of Enterococcus faecalis in Implanted Devices in Research Macaques. Appl Environ Microbiol 2018;84(18)Abstract
is a common opportunistic pathogen that colonizes cephalic recording chambers (CRCs) of macaques used in cognitive neuroscience research. We previously characterized 15 strains isolated from macaques at the Massachusetts Institute of Technology (MIT) in 2011. The goal of this study was to examine how a 2014 protocol change prohibiting the use of antimicrobials within CRCs affected colonizing strains. We collected 20 isolates from 10 macaques between 2013 and 2017 for comparison to 4 isolates previously characterized in 2011 with respect to the sequence type (ST) distribution, antimicrobial resistance, biofilm formation, and changes in genes that might confer a survival advantage. ST4 and ST55 were predominant among the isolates characterized in 2011, whereas the less antimicrobial-resistant lineage ST48 emerged to dominance after 2013. Two macaques remained colonized by ST4 and ST55 strains for 5 and 4 years, respectively. While the antimicrobial resistance and virulence factors identified in these ST4 and ST55 strains remained relatively stable, we detected an increase in biofilm formation ability over time in both isolates. We also found that ST48 strains were typically robust biofilm formers, which could explain why this ST increased in prevalence. Finally, we identified mutations in the DNA mismatch repair genes and in separate ST55 and ST4 strains and confirmed that strains bearing these mutations displayed a hypermutator phenotype. The presence of a hypermutator phenotype may complicate future antimicrobial treatment for clinically relevant infections in macaques. is a common cause of health care-associated infections in humans, largely due to its ability to persist in the hospital environment, colonize patients, acquire antimicrobial resistance, and form biofilms. Understanding how enterococci evolve in health care settings provides insight into factors affecting enterococcal survival and persistence. Macaques used in neuroscience research have long-term cranial implants that, despite best practices, often become colonized by This provides a unique opportunity to noninvasively examine the evolution of enterococci on a long-term indwelling device. We collected strains from cephalic implants over a 7-year period and characterized the sequence type, antimicrobial resistance, virulence factors, biofilm production, and hypermutator phenotypes. Improved antimicrobial stewardship allowed a less-antimicrobial-resistant strain to predominate at the implant interface, potentially improving antimicrobial treatment outcomes if future clinical infections occur. Biofilm formation appears to play an important role in the persistence of the strains associated with these implants.
Lin M, Anesi SD, Ma L, Ahmed A, Small K, Foster SC. Characteristics and Visual Outcome of Refractory Retinal Vasculitis Associated With Antineutrophil Cytoplasm Antibody-Associated Vasculitides. Am J Ophthalmol 2018;187:21-33.Abstract
PURPOSE: To describe the clinical characteristics, therapies, visual outcomes, and prognoses of patients with retinal vasculitis associated with antineutrophil cytoplasmic antibody (ANCA)-associated vasculitides (AAV). DESIGN: Retrospective case series. METHODS: Patients diagnosed with retinal vasculitis associated with AAV and at least 6 months of follow-up were included. Demographic data, systemic and ocular features, best-corrected visual acuity at the initial visit and latest visit, fluorescein angiography (FA) and indocyanine green angiography (ICGA) findings, therapy regimen, and outcome were collected from the Massachusetts Eye Research and Surgery Institution (MERSI) database from 2006 to 2017. RESULTS: Fourteen patients (22 eyes) were identified. Twelve had granulomatosis with polyangiitis (GPA) and 1 each had microscopic polyangiitis (MPA) and eosinophilic granulomatosis with polyangiitis (EGPA). FA showed that AAV affected small-to-medium-size retinal vessels. Seven cases (50%) had both vein/venule and artery/arteriole involvement. Four cases co-presented with choroidal vasculitis. All of them failed various immunomodulatory therapies prior to referral to MERSI. Six patients received rituximab plus prednisone as their final therapy and 5 of them achieved remission. Four patients who failed cyclophosphamide previously were induced into remission by rituximab. Patients were followed for 33.4 ± 25.5 (range 6-84) months. Nine of 14 patients (64.3%) achieved remission at their latest visit. Seventeen of 22 eyes (77.3%) met the criteria for a good (≥20/40) visual outcome. CONCLUSION: The majority of patients enjoyed a good visual outcome and achieved remission after aggressive treatment. Rituximab should be considered as an initial treatment for patients with refractory retinal vasculitis associated with AAV.
Lin S-C, Pasquale LR, Singh K, Lin SC. The Association Between Body Mass Index and Open-angle Glaucoma in a South Korean Population-based Sample. J Glaucoma 2018;27(3):239-245.Abstract
PURPOSE: The purpose of this article is to investigate the association between body mass index (BMI) and open-angle glaucoma (OAG) in a sample of the South Korean population. MATERIALS AND METHODS: The sample consisted of a cross-sectional, population-based sample of 10,978 participants, 40 years of age and older, enrolled in the 2008 to 2011 Korean National Health and Nutrition Examination Survey. All participants had measured intraocular pressure <22 mm Hg and open anterior chamber angles. OAG was defined using disc and visual field criteria established by the International Society for Geographical and Epidemiological Ophthalmology. Multivariable analyses were performed to determine the association between BMI and OAG. These analyses were also performed in a sex-stratified and age-stratified manner. RESULTS: After adjusting for potential confounding variables, lower BMI (<19 kg/m) was associated with greater risk of OAG compared with normal BMI (19 to 24.9 kg/m) [odds ratio (OR), 2.28; 95% confidence interval (CI), 1.22-4.26]. In sex-stratified analyses, low BMI remained adversely related to glaucoma in women (OR, 3.45; 95% CI, 1.42-8.38) but not in men (OR, 1.72; 95% CI, 0.71-4.20). In age-stratified analyses, lower BMI was adversely related to glaucoma among subjects 40- to 49-year old (OR, 5.16; 95% CI, 1.86-14.36) but differences in glaucoma prevalence were not statistically significant between those with low versus normal BMI in other age strata. CONCLUSIONS: Lower BMI was associated with increased odds of OAG in a sample of the South Korean population. Multivariate analysis revealed the association to be statistically significant in women and those in the youngest age stratum.
Lippestad M, Hodges RR, Utheim TP, Serhan CN, Dartt DA. Signaling pathways activated by resolvin E1 to stimulate mucin secretion and increase intracellular Ca in cultured rat conjunctival goblet cells. Exp Eye Res 2018;173:64-72.Abstract
Glycoconjugate mucin secretion from conjunctival goblet cells is tightly regulated by nerves and specialized pro-resolving mediators (SPMs) to maintain ocular surface health. Here we investigated the actions of the SPM resolvin E1 (RvE1) on cultured rat conjunctival goblet cell glycoconjugate secretion and intracellular [Ca] ([Ca]) and the signaling pathways used by RvE1. Goblet cells were cultured from rat conjunctiva in RPMI medium. The amount of RvE1-stimulated glycoconjugate mucin secretion was determined using an enzyme-linked lectin assay with Ulex Europaeus Agglutinin 1 lectin. Cultured goblet cells were also incubated with the Ca indicator dye fura 2/AM and [Ca] was measured. Cultured goblet cells were incubated with inhibitors to phospholipase (PL-) C, D, and A2 signaling pathways. RvE1 stimulated glycoconjugate secretion in a concentration dependent manner and was inhibited with the Ca chelator BAPTA. The Ca response was also increased in a concentration manner when stimulated by RvE1. Inhibition of PLC, PLD, and PLA2, but not Ca/calmodulin-dependent kinase blocked RvE1-stimulated increase in [Ca] and glycoconjugate secretion. We conclude that under normal, physiological conditions RvE1 stimulates multiple pathways to increase glycoconjugate secretion and [Ca]. RvE1 could be an important regulator of goblet cell glycoconjugate mucin secretion to maintain ocular surface health.
Liu Y, Chen D, Chen X, Kam WR, Hatton MP, Sullivan DA. Hypoxia: A breath of fresh air for the meibomian gland. Ocul Surf 2018;Abstract
PURPOSE: Optimal meibomian gland (MG) function is critically important for the health and wellbeing of the ocular surface. We hypothesize that low oxygen (O) conditions promote the function of human MG epithelial cells (HMGECs) and that human MGs exist in a relatively hypoxic environment. The purpose of this study was to test our hypotheses. METHODS: We used human and mouse eyelid segments, and immortalized human MG epithelial cells (IHMGECs) in our studies. To evaluate oxygen (O) levels in the mouse MG and vicinity, we injected pimonidazole (pimo), a hypoxia marker, before sacrifice. Human eyelid samples were stained with the hypoxia marker glucose transporter 1 (Glut-1). To determine the effect of low O levels on IHMGECs, we cultured cells under proliferating and differentiating conditions in both normoxic (21% O) and hypoxic (3% O) conditions for 5-15 days. IHMGECs were evaluated for cell number, neutral lipid content, lysosome accumulation, expression of biomarker proteins and DNase II activity. RESULTS: Our results demonstrate that human and mouse MGs, but not the surrounding connective tissue, exist in a relatively hypoxic environment in vivo. In addition, our findings show that hypoxia does not influence IHMGEC numbers in basal or proliferating culture conditions, but does stimulate the expression of SREBP-1 in differentiating IHMGECs. Hypoxia also significantly increased DNase II activity, and apparently IHMGEC terminal differentiation. CONCLUSIONS: Our Results support our hypotheses, and indicate that relative hypoxia promotes MG function.
Llop SM, Davoudi S, Stanwyck LK, Sathe S, Tom L, Ahmadi T, Grotting L, Papaliodis GN, Sobrin L. Association of Low Vitamin D Levels with Noninfectious Uveitis and Scleritis. Ocul Immunol Inflamm 2018;:1-8.Abstract
PURPOSE: To determine whether an association between Vitamin D and noninfectious ocular inflammation exists. METHODS: Retrospective case-control study with 765 patients (333 uveitis cases, 103 scleritis cases, 329 controls). Logistic regression models examined the relationship between hypovitaminosis D and ocular inflammation. RESULTS: The odds of having uveitis were 1.92 times higher for patients with hypovitaminosis D compared to patients with normal Vitamin D levels in the multivariate analysis [odds ratio (OR) = 1.92, 95% Confidence Interval (CI) = 1.36-2.72, p = 2.32 × 10]. A secondary analysis demonstrated that the odds of developing uveitis or scleritis were 5% lower and 4% lower, respectively, for every unit increase in Vitamin D level (uveitis: OR = 0.95, 95% CI = 0.94-0.97, p = 9.87 × 10; scleritis: OR = 0.96, 95% CI = 0.93-0.99, p = 0.009). CONCLUSION: Hypovitaminosis D was associated with increased risk of ocular inflammation in this retrospective study.
Löfqvist CA, Najm S, Hellgren G, Engström E, Sävman K, Nilsson AK, Andersson MX, Hård A-L, Smith LEH, Hellström A. Association of Retinopathy of Prematurity With Low Levels of Arachidonic Acid: A Secondary Analysis of a Randomized Clinical Trial. JAMA Ophthalmol 2018;136(3):271-277.Abstract
Importance: Mice with oxygen-induced retinopathy fed matched diets except for ω-3 long-chain polyunsaturated fatty acids (LC-PUFAs) vs ω-6 LC-PUFAs demonstrate relative antiangiogenic and neuroprotective associations of ω-3 LC-PUFAs. However, supplementing preterm infants with LC-PUFAs has been inconsistent in reducing major preterm morbidities. However, few studies measured serum lipid levels after supplementation. Objective: To examine the associated risk of retinopathy of prematurity (ROP) from the levels of circulating ω-3 and ω-6 LC-PUFAs. Design, Setting, and Participants: This longitudinal clinical study was a further analysis of serum lipid levels from a randomized controlled trial cohort of 90 infants born at gestational age (GA) less than 28 weeks. From April 4, 2013, to September 22, 2015, cord blood samples, followed by venous blood samples, were obtained at birth and at 1, 7, 14, and 28 days after birth and then at postmenstrual age (PMA) 32, 36, and 40 weeks at the neonatal intensive care unit at Sahlgrenska University Hospital in Göteborg, Sweden. Main Outcomes and Measures: Serum phospholipid fatty acids were transmethylated and measured by gas chromatography-mass spectrometry. Mann-Whitney test, logistic regression Spearman rank correlation, and receiver operating characteristic curve analysis were used to compare differences between infants with no ROP and infants who developed ROP. Results: Serum levels from 78 infants (43 male [55%]; mean [SD] GA, 25.5 [1.4] weeks) with a known ROP outcome were evaluated. Lower area under the curve (AUC) of arachidonic acid (AA) (20:4 ω-6) was seen in infants with a later diagnosis of ROP compared with infants with no ROP in the first month of life (mean, 34.05 [95% CI, 32.10-36.00] vs 37.15 [95% CI, 34.85-39.46]; P < .05). In addition, lower levels of AA at 32 weeks' PMA were seen in infants with later severe ROP compared with in those without ROP (mean, 7.06 [95% CI, 6.60-7.52] vs 8.74 [95% CI, 7.80-9.67]; P < .001). In logistic modeling, low postnatal serum levels of AA and GA at birth identified with a sensitivity greater than 90% of infants who developed ROP. Conclusions and Relevance: Low postnatal levels of the ω-6 LC-PUFAs (AA) are strongly associated with ROP development. Evaluating postnatal AA fraction after birth in addition to GA may be useful for ROP prediction. Trial Registration: clinicaltrials.gov Identifier: NCT02760472.
Lopez MJ, Seyed-Razavi Y, Jamali A, Harris DL, Hamrah P. The Chemokine Receptor CXCR4 Mediates Recruitment of CD11c+ Conventional Dendritic Cells Into the Inflamed Murine Cornea. Invest Ophthalmol Vis Sci 2018;59(13):5671-5681.Abstract
Purpose: The cornea contains distinct populations of antigen-presenting cells (APCs), including conventional dendritic cells (cDCs). Little is known about the molecular mechanisms involved in cDCs homing and recruitment into the naïve and inflamed cornea. The purpose of this study was to investigate the presence of CXCR4 and its ligand CXCL12 in the murine cornea and its role in cDC migration during corneal inflammation. Methods: The expression of CXCR4 and CXCL12 in naïve and suture-inflamed murine corneas was assessed by whole-mount staining, flow cytometry, and quantitative PCR. The role of CXCR4 in recruitment into inflamed corneas was investigated using adoptive transfer of cDCs blocked with neutralizing antibody against CXCR4. Results: We show the chemokine receptor CXCR4 to be expressed on 51.7% and 64.8% of total corneal CD11c+ cDCs, equating to 98.6 ± 12.5 cells/mm2 in the peripheral and 64.7 ± 10.6 cells/mm2 in the central naïve cornea, respectively. Along with a 4.5-fold increase in CXCL12 expression during inflammation (P < 0.05), infiltrating cDCs also expressed CXCR4 in both the peripheral (222.6 ± 33.3 cells/mm2; P < 0.001) and central cornea (161.9 ± 23.8 cells/mm2; P = 0.001), representing a decrease to 31.0% and 37.3% in the cornea, respectively. Further, ex vivo blockade (390.1 ± 40.1 vs. 612.1 ± 78.3; P = 0.008) and local blockade (263.5 ± 27.1 vs. 807.5 ± 179.5, P < 0.001) with anti-CXCR4 neutralizing antibody resulted in a decrease in cDCs homing into the cornea compared with cells pretreated with isotype controls. Conclusions: Our results demonstrate that corneal CXCL12 plays a direct role in CXCR4+ cDC recruitment into the cornea. The CXCR4/CXCL12 axis is therefore a potential target to modulate corneal inflammatory responses.
M Mallery R, Poolman P, J Thurtell M, Full JM, Ledolter J, Kimbrough D, Frohman EM, Frohman TC, Kardon RH. Visual Fixation Instability in Multiple Sclerosis Measured Using SLO-OCT. Invest Ophthalmol Vis Sci 2018;59(1):196-201.Abstract
Purpose: Precise measurements of visual fixation and its instability were recorded during optical coherence tomography (OCT) as a marker of neural network dysfunction in multiple sclerosis (MS), which could be used to monitor disease progression or response to treatment. Methods: A total of 16 MS patients and 26 normal subjects underwent 30 seconds of scanning laser ophthalmoscope (SLO)-based eye tracking during OCT scanning of retinal layer thickness. Study groups consisted of normal eyes, MS eyes without prior optic neuritis (MS wo ON), and MS eyes with prior optic neuritis (MS + ON). Kernel density estimation quantified fixation instability from the distribution of fixation points on the retina. In MS wo ON eyes, fixation instability was compared to other measures of visual and neurologic function. Results: Fixation instability was increased in MS wo ON eyes (0.062 deg2) compared to normal eyes (0.030 deg2, P = 0.015). A further increase was seen for MS + ON eyes (0.11 deg2) compared to MS wo ON (P = 0.04) and normal (P = 0.006) eyes. Fixation instability correlated weakly with ganglion cell layer (GCL) volume and showed no correlation with low-contrast letter acuity, EDSS score, or SDMT score. Conclusions: Fixation instability reflects the integrity of a widespread neural network germane to visual processing and ocular motor control, and is disturbed in MS. Further study of visual fixation, including the contribution of microsaccades to fixation instability, may provide insight into the localization of fixation abnormalities in MS and introduce innovative and easily measured outcomes for monitoring progression and treatment response.
Ma L, Jakobiec FA, Wolkow N, Dryja TP, Borodic GE. Multiple Eyelid Cysts (Apocrine and Eccrine Hidrocystomas, Trichilemmal Cyst, and Hybrid Cyst) in a Patient With a Prolactinoma. Ophthalmic Plast Reconstr Surg 2018;34(3):e83-e85.Abstract
A 53-year-old man presented with smooth-domed, variegated cysts (polycystic disease) of all 4 eyelids, worse on the left side. Some of the cysts were clear, while others were creamy-white colored. In addition, multiple, very fine vesicopapules were noted along the eyelid margins. Histopathologic examination revealed a trichilemmal cyst, several pure apocrine hidrocystomas displaying multiple chambers, a hybrid cyst, and many small eccrine cysts of the deep dermis. The apocrine lesions, including the small ones at the eyelid margins, predominated. Smooth muscle actin sometimes positively stained outer myoepithelial cells in some of the apocrine cysts, which helped to distinguish them from eccrine cysts. Most noteworthy was the fact that the patient had been diagnosed with a prolactinoma 20 years earlier. There is only 1 previous report of multiple apocrine cysts and an antecedent prolactinoma in the dermatologic literature. This syndrome should be separated from that of Schöpf-Schulz-Passarge, which manifests multiple small eyelid apocrine cysts and other ectodermal dysplasias without any association with neoplasia, and from that of focal dermal hypoplasia (Goltz-Gorlin) syndrome with apocrine cysts but again without neoplasia.
Ma L, You C, Hernandez M, Maleki A, Lasave A, Schmidt A, Stephenson A, Zhao T, Anesi S, Foster SC. Management of Ocular Cicatricial Pemphigoid with Intravenous Immunoglobulin Monotherapy. Ocul Immunol Inflamm 2018;:1-7.Abstract
PURPOSE: To assess the long-term efficacy and safety of IVIg monotherapy in patients with recalcitrant ocular cicatricial pemphigoid (OCP). METHODS: A chart review of all OCP patients seen at the Massachusetts Eye Research and Surgery Institution (MERSI) between 2005 and 2015 was completed. Stage was graded by using the Foster grading system. IVIg infusion was 2g/kg/cycle administered in 3 consecutive days monthly. RESULTS: Of 512 OCP patients, 17 patients (34 eyes) treated with IVIg monotherapy were identified. Seven were female and ten were male. The average age at diagnosis was 60.7-year-old. The follow up time ranged from 12 to 140 months. Twenty-six eyes (76.5%) achieved remission. Nine remission eyes received cataract surgeries, and 2 of them had relapse (22.2%). The other 17 eyes did not undergo ocular surgery and remained in remission. IVIg monotherapy showed high efficacy in stage 1 OCP (7/7, 100%). Ocular surgery can be associated with OCP relapse (Table 2). CONCLUSIONS: IVIg monotherapy is an effective and safe therapy in patients with recalcitrant OCP. Ocular surgery can be associated with OCP relapse.