Abstract
Tissue transglutaminase (tTG) is a novel G-protein that previous studies showed can couple ligand-bound activated α(1B) adrenoreceptors to phospholipase C-δ, resulting in phosphoinositide (PI) hydrolysis. In human neuroblastoma SH-SY5Y cells we found that although endogenous tTG can facilitate α(1B) adrenoreceptor-stimulated PI hydrolysis, its contribution is minor compared with the classical heterotrimeric G-protein G(q/11). Further, we show that the α(1B) adrenoreceptor recruits tTG to the membrane and that this recruitment is enhanced by agonist occupancy of the receptor. In addition, the effects of tTG on signalling are bimodal. At low expression levels, tTG enhanced α(1B) adrenoreceptor-stimulated PI hydrolysis, whereas at higher expression levels tTG attenuated significantly this response. These findings are the first to demonstrate that a protein can both facilitate and attenuate receptor-stimulated PI hydrolysis.
Original language | English (US) |
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Pages (from-to) | 541-549 |
Number of pages | 9 |
Journal | Biochemical Journal |
Volume | 343 |
Issue number | 3 |
DOIs | |
State | Published - Nov 1 1999 |
Externally published | Yes |
Keywords
- α(1B) adrenoreceptors
- Phosphoinositide hydrolysis
- Phospholipase C
- SH-SY5Y cells
ASJC Scopus subject areas
- Biochemistry