Abstract:
PURPOSE:To determine the order and components of the signaling pathway utilized by epidermal growth factor (EGF) to stimulate conjunctival goblet cell proliferation. METHODS:Goblet cells from rat bulbar and forniceal conjunctiva and human bulbar conjunctiva were grown in organ culture. Goblet cells (GCs) were serum starved for 24 hours and preincubated with inhibitors for 30 minutes or small interfering RNA (siRNA) for 48 hours prior to addition of EGF. Proliferation was then measured or Western blot analysis was performed using antibodies against phosphorylated protein kinase B (AKT), extracellular signal-regulated kinase 1/2 (ERK1/2), or the non-receptor tyrosine kinase Src. Rat GCs were also incubated with adenoviruses expressing dominant negative protein kinase Cα (DNPKCα) or constitutively activated protein kinase Cα (myrPKCα), and activation of AKT and ERK1/2 was determined by Western blot analysis. RESULTS:Inhibitors of phosphoinositol-3 kinase (PI-3K)/AKT pathway blocked EGF-stimulated ERK1/2 activation and GC proliferation. Inhibitors of EGF-stimulated ERK1/2 activity did not inhibit AKT activation but blocked proliferation. DNPKCα blocked EGF-stimulated activation of AKT and ERK1/2 while myrPKCα increased activation of these kinases. Inhibitors of PI-3K, ERK1/2, and protein kinase C (PKC) blocked myrPKCα-stimulated GC proliferation. EGF and myrPKCα increased phosphorylation of Src, and inhibition of Src with the chemical inhibitor PP1 or siRNA inhibited EGF-stimulated GC proliferation. CONCLUSIONS:We found that EGF activates a major pathway to stimulate goblet cell proliferation. This pathway consists of induction of phospholipase C (PLC)γ to activate PKCα. Active PKCα phosphorylates Src to induce PI-3K to phosphorylate AKT that subsequently activates the ERK1/2 cascade to stimulate goblet cell proliferation.
journal_name
Invest Ophthalmol Vis Scijournal_title
Investigative ophthalmology & visual scienceauthors
Li D,Shatos MA,Hodges RR,Dartt DAdoi
10.1167/iovs.13-12473subject
Has Abstractpub_date
2013-08-21 00:00:00pages
5661-74issue
8eissn
0146-0404issn
1552-5783pii
iovs.13-12473journal_volume
54pub_type
杂志文章abstract:PURPOSE:Retinal injuries that affect the photoreceptors and/or the retinal pigment epithelium (RPE) may result in the leakage of retinal proteins into the systemic circulation. This study was designed to determine whether an immune response is elicited after an acute retinal injury resulting in circulating anti-retinal...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.11-7685
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章,多中心研究
doi:10.1167/iovs.14-14763
更新日期:2014-07-11 00:00:00
abstract::Overall corneal hydration control expressed as the percent recovery per hour (PRPH) can be assessed with an exponential model that uses data derived from two kinds of corneal thickness measurements; one from monitoring recovery after inducing corneal swelling, and the other from measurements made after the eye has bee...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1990-07-01 00:00:00
abstract::In tear fluid, a large number of proteins can be detected with electrophoretic or immunologic techniques. The composition of serum proteins in tears resembles that of whole serum. By comparison of the protein patterns resulting from different sampling methods, it was shown that serum albumin is not present in the secr...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
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更新日期:1983-05-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
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journal_title:Investigative ophthalmology & visual science
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doi:
更新日期:1998-11-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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doi:
更新日期:1999-09-01 00:00:00
abstract::Previous research has demonstrated that distinct, gender-related differences exist in the morphology of the rat lacrimal gland. The purpose of the present study was to determine whether this sexual dimorphism is unique to the rat, or extends as well to other species. Lacrimal glands were collected from adult male and ...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
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更新日期:2018-02-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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doi:
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journal_title:Investigative ophthalmology & visual science
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更新日期:2010-11-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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更新日期:2014-12-11 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1991-09-01 00:00:00
abstract:PURPOSE:To investigate the role of angiopoietin-1 (Ang1) in choroidal neovascularization (CNV) and vascular leakage. METHODS:We generated laser-induced CNV in mice and measured the size of CNV and vascular leakage after intravitreal administration of Ang1. The expressions and distributions of endothelial junctional pr...
journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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doi:
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