Lysosomal degradation of RhoH protein upon antigen receptor activation in T but not B cells

Schmidt-Mende, Jan; Geering, Barbara; Yousefi, Shida; Simon, Hans-Uwe (2010). Lysosomal degradation of RhoH protein upon antigen receptor activation in T but not B cells. European journal of immunology, 40(2), pp. 525-9. Weinheim: Wiley-VCH 10.1002/eji.200939556

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RhoH is a member of the Rho (ras homologous) GTPase family, yet it lacks GTPase activity and thus remains in its active conformation. Unlike other Rho GTPases, the RhoH gene transcript is restricted to hematopoietic cells and RhoH was shown to be required for adequate T-cell activation through the TCR. Here, we demonstrate that both blood T and B cells, but not neutrophils or monocytes, express RhoH protein under physiological conditions. Upon TCR complex activation, RhoH was degraded in lysosomes of primary and Jurkat T cells. Pharmacologic activation of T cells distal to the TCR complex had no effect on RhoH protein levels suggesting that early events during T-cell activation are required for RhoH protein degradation. In contrast to T cells, activation of the BCR in blood B cells was not associated with changes in RhoH levels. These data suggest that RhoH function might be regulated by lysosomal degradation of RhoH protein following TCR complex but not BCR activation. This newly discovered regulatory pathway of RhoH expression might limit TCR signaling and subsequent T-cell activation upon Ag contact.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Pharmacology
UniBE Contributor:	Yousefi, Shida, Simon, Hans-Uwe
ISSN:	0014-2980
Publisher:	Wiley-VCH
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:09
Last Modified:	05 Dec 2022 14:00
Publisher DOI:	10.1002/eji.200939556
PubMed ID:	19950172
Web of Science ID:	000274670300027
URI:	https://boris.unibe.ch/id/eprint/891 (FactScience: 201184)