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• W2505860081 endingPage "244" @default.
• W2505860081 startingPage "231" @default.
• W2505860081 abstract "Channel catfish (Ictalurus punctatus) leukocyte immune-type receptors (IpLITRs) are immunoregulatory proteins that control innate immune cellular responses. Previously, we demonstrated that two representative IpLITR forms, IpLITR 2.6b and IpLITR 1.1b, engage distinct components of the phagocytic machinery resulting in unique target capture and engulfment phenotypes. IpLITR-induced phagocytic mechanisms were also differentially susceptible to temperature and pharmacological inhibitors of canonical signaling mediators. In the present study, we examined the sensitivity of IpLITR-mediated phagocytosis to the endogenous serine-protease trypsin, a well-known mediator of immunoregulatory receptor functions. Trypsin selectively reduced IpLITR 1.1b cell surface expression and phagocytic activity in a dose-dependent manner. We also observed a significant alteration of the IpLITR 1.1b phagocytic phenotype post-trypsin exposure; whereas, the IpLITR 2.6b-mediated target engulfment phenotype was unchanged. Recovery experiments suggested that trypsin-induced inhibition of IpLITR 1.1b-dependent phagocytosis was reversible and that the re-establishment of phagocytic function was associated with a recovery of receptor surface expression. Cell-surface biotinylation and immunoprecipitation studies demonstrated that IpLITR 1.1b normally exists as a mature (∼70 kDa) protein on the cell surface. However, trypsin treatment reduced expression of the mature receptor and processed IpLITR 1.1b into an ∼60 kDa form. The trypsin-generated and putative immature IpLITR 1.1b form was not present on the cell surface; suggesting that the cleaved receptor may have been internalized, post-processing, by regulated endocytosis. Taken together, these results reveal a unique role for trypsin as a selective modulator of IpLITR-mediated phagocytosis and highlight a conserved role for serine proteases as potent immunomodulatory factors." @default.
• W2505860081 created "2016-08-23" @default.
• W2505860081 creator A5008961441 @default.
• W2505860081 creator A5037864615 @default.
• W2505860081 creator A5042841355 @default.
• W2505860081 date "2016-12-01" @default.
• W2505860081 modified "2023-10-10" @default.
• W2505860081 title "Trypsin differentially modulates the surface expression and function of channel catfish leukocyte immune-type receptors" @default.
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• W2505860081 doi "https://doi.org/10.1016/j.dci.2016.07.014" @default.
• W2505860081 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27461858" @default.
• W2505860081 hasPublicationYear "2016" @default.
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