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Effect of recombinant equine interleukin-1β on function of equine endothelial colony-forming cells in vitro
Abstract
OBJECTIVE
To investigate the effects of recombinant equine IL-1β on function of equine endothelial colony-forming cells (ECFCs) in vitro.
SAMPLE
ECFCs derived from peripheral blood samples of 3 healthy adult geldings.
PROCEDURES
Function testing was performed to assess in vitro wound healing, tubule formation, cell adhesion, and uptake of 1,1′-dioctadecyl-3,3,3′,3′ tetramethylindocarbocyanine perchlorate–labeled acetylated low-density lipoprotein (DiI-Ac-LDL) by cultured ECFCs. Cell proliferation was determined by 2,3-bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide assay. Effects on function test results of different concentrations and exposure times of recombinant equine IL-1β were assessed.
RESULTS
Challenge of cultured ECFCs with IL-1β for 48 hours inhibited tubule formation. Continuous challenge (54 hours) with IL-1β in the wound healing assay reduced gap closure. The IL-1β exposure did not significantly affect ECFC adhesion, DiI-Ac-LDL uptake, or ECFC proliferation.
CONCLUSIONS AND CLINICAL RELEVANCE
These results suggested a role for IL-1β in the inhibition of ECFC function in vitro. Functional changes in ECFCs following challenge with IL-1β did not appear to be due to changes in cell proliferative capacity. These findings have implications for designing microenvironments for and optimizing therapeutic effects of ECFCs used to treat ischemic diseases in horses.
Contributor Notes
Dr. Winter's present address is the Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210.
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