The alpha-subunits of the widely expressed G-proteins Gq and G11 indistinguishably activate beta-isoforms of phospholipase C. In this report we have tested whether differences exist in the activation of both G-proteins via phospholipase C-linked receptors. We found that bombesin and vasopressin, with very similar potencies and time dependencies, induce the activation of both Gq and G11 in Swiss 3T3 cells, suggesting that these G-proteins, at least in part, serve interchangable functions.
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Offermanns et al. (1994) studied this question.
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