[The changes of spleen B cells of D-galactose-induced aging mice].

Aim: This paper is to analyze the changes of important membrane type molecules of the spleen B cells and their significance on the basis of biology identification by establishing subacute aging mice model with D-galactose.

Methods: Health Kunming mice are injected with 100 ng/L D-galactose, 0.25 mL/20 g, once per day, for 42 days consecutively, into their back necks. The animals' living conditions and biological behaviors are observed everyday and the dynamic changes of their weight are measured regularly. The biology identification of aging model mice is conducted by means of measuring the SOD viability and malondialdehyde (MDA) concentration in serum; the analysis of the activation- and memory-related important membrane type molecules of spleen cells is carried out with immune fluorescence and flow cytometry; the analysis of the concentration of IL-4 in serum is conducted by ELISA.

Results: Building a successful subactue aging mice model.The results of immune fluorescence and flow cytometry showed that CD20(+); was 56.8%, CD40(+); was 43.6%, CD20(+);CD45RA(+);B was 14.04%, CD40(+);CD45RA(+);B was 35.4%, CD20(+);CD86(+);B was 2.25%, CD40(+);CD86(+);B was 4.38%, CD20(+);CD196(+);B was 10.68%, and CD40(+);CD196(+);B was 10.98%. The results of ELISA showed that the average level of IL-4 in serum was 7.93 ng/L. The statistical analysis showed that the expressions of CD20, CD40, CD45RA, and CD86 of the spleen cells of the model control group and the average level of IL-4 in serum were lower than the normal control group(P<0.05)while CD196 was higher than the normal control group(P<0.01).

Conclusion: In the body's aging process, the expressions of the activation- and memory-related important membrane type molecules of spleen cells change, activated cells reduce, memory cells increase, and the expression of IL-4 in serum drop, resulting in the immune system function disorder.