The effect of abnormal lipid metabolism on immunosenescence of the colonic lamina propria in mice of different ages.

Immunosenescence is an age-associated change in immunological function. The intestinal mucosal immune system is considered the largest immune system in the human body, and its immunosenescence is closely related to the occurrence and development of many diseases. In recent years, studies have identified a crucial correlation between abnormal lipid metabolism induced by high-fat diet (HFD) and immunity, but the effect and mechanism of HFD on colonic mucosal immunosenescence are still unclear. In this study, we established an abnormal lipid metabolism model at different ages by feeding male wild-type mice HFD and compared the immunosenescence of the spleen, which reflects systemic immunity, and the colonic lamina propria (LP), which reflects local immunity. The results showed that HFD could lead to abnormal lipid metabolism at different ages, accelerate systemic and local immunosenescence, and increase the expression of inflammatory factors in colonic tissue. The levels of abnormal biochemical indicators induced by HFD were closely related to the proportions of T cell subsets associated with immunosenescence. Overall, the results showed that HFD had the most significant impact on aged mice. This study provides new ideas for further understanding the relationship between abnormal lipid metabolism and intestinal mucosal immunosenescence.