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Baicalin alleviates uterine inflammaging and improves eggshell quality in aged laying hens

Shao D, Qu Y, Qu L, Tong H

Frontiers in immunology, 2026

Abstract

Aging is a major contributor to the decline in egg quality, with uterine inflammaging playing a key role in this process. Implementing anti-aging strategies to prevent uterine inflammaging and sustain optimal eggshell quality is imperative. This study aimed to characterize age-related changes in the eggshells and uteri of hens at different laying stages and the regulatory effect of baicalin (BAI). Uterine inflammaging became progressively more evident with advancing hen age, as indicated by fibrosis of the lamina propria connective tissue, decreased height and width of primary uterine folds (P α) and interleukin-6 (IL-6), and decreased messenger RNA (mRNA) expression of the longevity gene sirtuin 1 (SIRT1) (P P in vivo, BAI treatment alleviated uterine inflammaging, mainly reflected in reduced secretion of the proinflammatory cytokines interleukin-1 beta (IL-1β), IL-6, and interleukin-8 (IL-8) and reduced expression of TNF-α, IL-1β, p53, and p21 (P P P In vitro, compared to uterine epithelial cells cultured with β-galactosidase, BAI pretreatment increased cell viability, decreased the positive staining rate of senescent cells, downregulated the relative expression of IL-6, IL-1β, TNF-α, p53, and p21, and increased SIRT1 mRNA levels (P < 0.05). Overall, uterine inflammaging was closely associated with age-related deterioration in eggshell quality, and BAI administration was associated with improved eggshell quality and reduced uterine inflammaging.

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