| First Author | Zhu T | Year | 1993 |
| Journal | J Biochem | Volume | 114 |
| Issue | 1 | Pages | 50-4 |
| PubMed ID | 8407876 | Mgi Jnum | J:21453 |
| Mgi Id | MGI:66563 | Doi | 10.1093/oxfordjournals.jbchem.a124139 |
| Citation | Zhu T, et al. (1993) Alterations in activities of protein phosphatases PP1 and PP2A in T and B lymphocytes of autoimmune MRL/MpJ-lpr/lpr mice. J Biochem 114(1):50-4 |
| abstractText | Activities of protein phosphatases PP1 and PP2A were determined in T and B lymphocytes of autoimmune-prone MRL/MpJ-lpr/lpr mice (MRL/lpr mice) and two control strains, MRL/MpJ-(+)/+ mice (MRL/+/+ mice) and C3H/HeJ mice. Potential PP1 activity, which was measured after treatment of cell extract with Co(2+)-trypsin, was much higher in T lymphocytes than B lymphocytes. However, no difference in the activity was observed between MRL/lpr mice and the controls. Spontaneous PP2A activity showed similar levels in T and B lymphocytes from normal mice, but potential PP2A activity, which was measured after treatment with 2-mercaptoethanol, was significantly higher in T lymphocytes from MRL/lpr mice than those from controls. No differences were detected in PP1 or PP2A activities in B lymphocytes. From these results, our previous data [Matsuzawa, S. et al. (1992) J. Biochem. 111, 472-477] demonstrating increases in potential activities of PP1 and PP2A in lymphoid tissues from autoimmune MRL/lpr mice can be interpreted as follows. 1) The increase in potential PP1 activity of the lymphoid tissues from MRL/lpr mice is caused by replacement of B lymphocytes by abnormal T lymphocytes, which accumulate in enormous numbers. 2) The increase of potential PP2A activity in the lymphoid tissues from MRL/lpr mice is caused by the increase in this activity in their T lymphocytes. |
