Strain specific IL15 expression analysis in homozygous B-hIL15/hIL15RA mice by ELISA. (A) Mouse IL15; (B) Human IL15; Serum was collected from wild-type mice (+/+) and homozygous B-hIL15/hIL15RA mice (H/H), and analyzed by ELISA with species-specific IL15 ELISA kit. Human IL15 was only detectable in homozygous B-hIL15/hIL15RA mice but not in wild-type mice. Mouse IL15 was both detectable in wild-type mice and homozygous B-hIL15/hIL15RA mice. According to that mouse IL15 was not detection in homozygous B-hIL15/hIL15RA mice in mRNA level, probably the ELISA kit has cross reaction between human and mouse.

Protein expression analysis

Analysis of T cell subpopulations by FACS. Splenocytes were isolated from female C57BL/6 and B-hIL15/hIL15RA mice (n=3, female, 8-week-old). The proportion of T cells subpopulation was tested by flow cytometry. A. Representative FACS plots. Single live cells were gated for the CD3+ population and used for further analysis as indicated here. B. Results of FACS analysis. Percent of CD4+ T cells, CD8+ T cells and Tregs in homozygous B-hIL15/hIL15RA mice were similar to those in the C57BL/6 mice. Values are expressed as mean ± SEM.

Analysis of blood leukocytes subpopulation