Showing papers by "Pratap Challa published in 2018"
TL;DR: This work successfully profiled the miRNA expression without amplification in individual human AH samples and identified several POAG or XFG-associated miRNAs that may play a role in pathways previously implicated in glaucoma and act as biomarkers for disease pathogenesis.
Abstract: Both exfoliation glaucoma (XFG) and primary open-angle glaucoma (POAG) have been linked to decreased conventional outflow of aqueous humor (AH). To better understand the molecular changes in the AH content under such conditions, we analyzed the miRNA profiles of AH samples from patients with POAG and XFG compared to non-glaucoma controls. Individual AH samples (n = 76) were collected from POAG and XFG patients and age-matched controls during surgical procedure. After RNA extraction, the miRNA profiles were individually determined in 12 POAG, 12 XFG and 11 control samples. We identified 205, 295 and 195 miRNAs in the POAG, XFG and control samples, respectively. Our differential expression analysis identified three miRNAs (miR-125b-5p, miR-302d-3p and miR-451a) significantly different between POAG and controls, five miRNAs (miR-122-5p, miR-3144-3p, miR-320a, miR-320e and miR-630) between XFG and controls and one miRNA (miR-302d-3p) between POAG and XFG. While none of these miRNAs have been previously linked to glaucoma, miR-122-5p may target three glaucoma-associated genes: OPTN, TMCO1 and TGF-s1. Pathway analysis revealed that these miRNAs are involved in potential glaucoma pathways, including focal adhesion, tight junctions, and TGF-s signaling. Comparison of the miRNA profile in AH to unrelated human serum (n = 12) exposed potential relationships between these two fluids, although they were not significantly correlated. In summary, we have successfully profiled the miRNA expression without amplification in individual human AH samples and identified several POAG or XFG-associated miRNAs. These miRNAs may play a role in pathways previously implicated in glaucoma and act as biomarkers for disease pathogenesis.
60 citations
TL;DR: This supplemental section identifies the advances in knowledge and current understanding of the components within X FM with a specific focus on the most recent work defining proteins within XFM and to pose several biological questions that remain unanswered.
Abstract: Exfoliation glaucoma (XFG) is the most common identifiable cause of open-angle glaucoma worldwide, and results from the accumulation of extracellular fibrillary material (XFM) within the trabecular meshwork and the Schlemm canal leading to increased intraocular pressure and potential blindness. Immunohistochemical and mass spectrometry analyses have revealed that XFM is a highly glycosylated proteinaceous complex that is extremely resistant to degradation both within the body and under experimental conditions. The protein core contains a wide variety of proteins, including basement membrane proteins, elastic fiber proteins, latent TGFβ proteins, metalloproteinases, chaperone proteins, complement proteins, lysyl oxidase-like 1 (LOXL1), and apolipoprotein E (ApoE). This supplemental section identifies the advances in knowledge and current understanding of the components within XFM with a specific focus on the most recent work defining proteins within XFM and to pose several biological questions that remain unanswered.
15 citations
TL;DR: CAV can be safely combined with cataract surgery and glaucoma surgery, and it may be an effective intervention in eyes with CNAG and other risk factors for AM as a prophylactic measure against the development of AM.
8 citations