Stage of infection with Mycobacterium avium subsp. paratuberculosis impacts expression of Rab5, Rab7, and CYP27B1 in macrophages within the ileum of naturally infected cows.

Autor: Wherry TLT; Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, Ames, IA, United States.; United States Department of Agriculture-Agricultural Research Service (USDA-ARS), National Animal Disease Center, Ames, IA, United States., Heggen M; Department of Nutritional Sciences, College of Agricultural and Life Sciences, University of Wisconsin-Madison, Madison, WI, United States., Shircliff AL; United States Department of Agriculture-Agricultural Research Service (USDA-ARS), National Animal Disease Center, Ames, IA, United States., Mooyottu S; Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, Ames, IA, United States., Stabel JR; United States Department of Agriculture-Agricultural Research Service (USDA-ARS), National Animal Disease Center, Ames, IA, United States.
Jazyk: angličtina
Zdroj: Frontiers in veterinary science [Front Vet Sci] 2023 Feb 03; Vol. 10, pp. 1117591. Date of Electronic Publication: 2023 Feb 03 (Print Publication: 2023).
DOI: 10.3389/fvets.2023.1117591
Abstrakt: Introduction: Macrophages are the preferential target of Mycobacterium avium subsp. paratuberculosis (MAP), the etiologic agent of ruminant paratuberculosis. Uptake of pathogens by intestinal macrophages results in their trafficking through endosomal compartments, ultimately leading to fusion with an acidic lysosome to destroy the pathogen. MAP possesses virulence factors which disrupt these endosomal pathways. Additionally, levels of serum vitamin D 3 have proven relevant to host immunity. Dynamics of endosomal trafficking and vitamin D 3 metabolism have been largely unexplored in bovine paratuberculosis.
Methods: This study aimed to characterize expression of early and late endosomal markers Rab5 and Rab7, respectively, within CD68+ macrophages in frozen mid-ileum sections harvested from cows at different stages of natural paratuberculosis infection. Additionally, factors of vitamin D 3 signaling and metabolism were characterized through expression of vitamin D 3 activating enzyme 1α-hydroxylase (CYP27B1), vitamin D 3 inactivating enzyme 24-hydroxylase (CYP24A1), and vitamin D 3 receptor (VDR) within CD68+ ileal macrophages.
Results and Discussion: Cows with clinical paratuberculosis had significantly greater macrophage and MAP burden overall, as well as intracellular MAP. Total expression of Rab5 within macrophages was reduced in clinical cows; however, Rab5 and MAP colocalization was significantly greater in this group. Intracellular Rab7 colocalization with MAP was not detected in subclinical or Johne's Disease negative (JD-) control cows but was present in clinical cows. Additionally, macrophage CYP27B1 expression was significantly reduced in clinical cows. Taken together, the results from this study show disparate patterns of expression for key mediators in intracellular MAP trafficking and vitamin D metabolism for cows at different stages of paratuberculosis.
Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
(Copyright © 2023 Wherry, Heggen, Shircliff, Mooyottu and Stabel.)
Databáze: MEDLINE
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