The impact of donor characteristics on the immune cell composition of second allografts in Chinese people.

ABSTRACT

BACKGROUND: The association of the donor characteristics with the immune cell composition in second allografts remains poorly understood. In this study, we investigated retrospectively the effects of the donor characteristics on the immune cell composition in second allografts. STUDY DESIGN AND METHODS: The immune cell composition in second allografts of granulocyte colony-stimulating factor (G-CSF) mobilized peripheral blood harvests from 100 healthy donors (male, 47, female, 53; median age, 39 years old) who underwent a second-time donation were correlated with their donor characteristics. RESULTS: The median counts of CD3(+) T cells, CD4(+) T cells, CD8(+) T cells, CD3(+) CD4(-) CD8(-) T cells and monocytes in allografts were 150·17 × 10(6) /kg, 82·57 × 10(6) /kg, 48·02 × 10(6) /kg and 24·97 × 10(6) /kg, respectively. Multivariate analysis showed that the number of lymphocytes and platelets pre-first collection of G-CSF mobilized blood (FM) was strongly associated with the number of total lymphocytes (for lymphocytes, P = 0·003; for platelets, P = 0·012), CD3(+) T cells (for lymphocytes, P = 0·009; for platelets, P = 0·004) and CD3(+) CD4(+) T cells (for lymphocytes, P = 0·035; for platelets, P = 0·004) in the second allograft. The donor's BMI was negatively related to the number of CD3(+) T cells (P = 0·022) and CD3(+) CD4(+) T cells (P = 0·026) in the second allograft. The donor weight was negatively associated with the number of CD3(+) CD4(-) CD8(-) T cells (P = 0·015) in the second allograft, while the pre-FM white blood cell count showed a positive correlation (P = 0·009). CONCLUSION: The results demonstrate the impact of the donor characteristics, including pre-FM platelet count and lymphocyte count, donor BMI and weight, on the immune cell composition in the second allograft.