Lipoxin A4 Counter-regulates Histamine-stimulated Glycoconjugate Secretion in Conjunctival Goblet Cells.

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Lipoxin A4 Counter-regulates Histamine-stimulated Glycoconjugate Secretion in Conjunctival Goblet Cells.

Sci Rep. 2016 11 08;6:36124

Authors: Hodges RR, Li D, Shatos MA, Serhan CN, Dartt DA

Abstract
Conjunctival goblet cells synthesize and secrete mucins which play an important role in protecting the ocular surface. Pro-resolution mediators, such as lipoxin A4 (LXA4), are produced during inflammation returning the tissue to homeostasis and are also produced in non-inflamed tissues. The purpose of this study was to determine the actions of LXA4 on cultured human conjunctival goblet cell mucin secretion and increase in intracellular [Ca2+] ([Ca2+]i) and on histamine-stimulated responses. LXA4 increased mucin secretion and [Ca2+]i, and activated ERK1/2 in human goblet cells. Addition of LXA4 before resolvin D1 (RvD1) decreased RvD1 responses though RvD1 did not block LXA4 responses. LXA4 inhibited histamine-stimulated increases in mucin secretion, [Ca2+]i, and ERK1/2 activation through activation of β-adrenergic receptor kinase 1. We conclude that conjunctival goblet cells respond to LXA4 through the ALX/FPR2 receptor to maintain homeostasis of the ocular surface and regulate histamine responses and could provide a new therapeutic approach for allergic conjunctivitis and dry eye diseases.

PMID: 27824117 [PubMed - indexed for MEDLINE]

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