Immune cell populations residing in mesenteric adipose depots and mesenteric lymph nodes of lean dairy cows

Journal of Dairy Science
B A AylwardR M Dyer

Abstract

Inconsistent evidence of inflammatory immune cell infiltrates in adipose tissues with extensive triglyceride mobilization raises the possibility that regulatory or anti-inflammatory immune cell populations reside within the mesenteric adipose tissue (MAT) and mesenteric lymph nodes (MLN). These resident immune cell populations may be involved in attenuating the inflammatory response. We explored the immune cell population of MAT and MLN collected from lean, lactating Holstein cows without apparent disease in an abattoir (n = 42). Lean cows had a body condition score of 2.6 ± 0.1 (mean ± SD) with a greater frequency of adipocyte area occurring in small rather than large adipocytes. Cells were labeled with monoclonal antibodies specific to bovine leukocyte antigens for enumeration by flow cytometry. Within both lymph node and adipose tissues, relatively large subpopulations of cells expressed the β2 integrins CD11b and CD11c, class II major histocompatibility antigens (MHCII), and the SIIRP-1α receptor (CD172a) typical of dendritic cells and macrophages. Macrophage/dendritic cell heterogeneity was marked by β2 integrin expression alone or in conjunction with CD172a or MHCII across subpopulations from both tissues; CD209, the DC-S...Continue Reading

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Feb 7, 2020·Animal : an International Journal of Animal Bioscience·B J Bradford, T H Swartz

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