A high-concentrate diet provokes inflammation, endoplasmic reticulum stress, and apoptosis in mammary tissue of dairy cows through the upregulation of STIM1/ORAI1

Jan 31, 2022Journal of dairy science

A high-concentrate diet may cause inflammation, cell stress, and cell death in dairy cow mammary tissue by increasing STIM1/ORAI1 levels

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Abstract

High-concentrate feeding significantly increased blood lipopolysaccharide levels and decreased ruminal pH in dairy cows.

  • The high-concentrate diet led to higher concentrations of calcium and proinflammatory cytokines such as TNF-α, IL-1β, and IL-6.
  • Increased enzyme activities of caspase-3, caspase-9, protein kinase C (PKC), and IκB kinase (IKK) were observed with high-concentrate feeding.
  • Activation of the STIM1/ORAI1-mediated inflammatory signaling pathway was indicated by upregulation of specific proteins in the high-concentrate group.
  • Endoplasmic reticulum stress was induced by the high-concentrate diet, shown by increased levels of stress-related proteins like GRP78 and CHOP.
  • The high-concentrate diet was associated with increased expression of apoptosis markers, while Bcl-2 levels were significantly decreased.

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