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. 2001 Sep 1;358(Pt 2):489–495. doi: 10.1042/0264-6021:3580489

c-Jun N-terminal kinase-interacting protein 1 inhibits gene expression in response to hypertrophic agonists in neonatal rat ventricular myocytes.

S G Finn 1, M Dickens 1, S J Fuller 1
PMCID: PMC1222083  PMID: 11513749

Abstract

G(q)-coupled receptor agonists, such as endothelin-1 (ET-1) and phenylephrine (PE), initiate a hypertrophic response in cardiac myocytes that is characterized by increased expression of atrial natriuretic factor (ANF), beta-myosin heavy chain (beta-MHC), skeletal muscle alpha-actin (SkalphaA) and ventricular myosin light chain-2 (vMLC2). ET-1 and PE activate both the extracellular signal-regulated kinases and c-Jun N-terminal kinases (JNKs) in cardiac myocytes, but the extent to which each contributes to the hypertrophic response is uncertain. Here we have used the JNK-binding domain of JNK-interacting protein 1 (JIP-1), a cytosolic scaffold protein that binds to JNK and inhibits its signalling when overexpressed, to assess the contribution of JNK activation to the hypertrophic response. Expression of JIP-1 inhibited the increase in ANF, beta-MHC, SkalphaA and vMLC2 reporter gene expression in response to ET-1 (by 45-86%) and PE (by 56-60%). However, activation of these reporter genes by PMA, which does not activate JNK significantly in myocytes, was much less affected by overexpression of JIP-1. JIP-1 also failed to inhibit reporter gene activation in response to constitutively active Ras or Raf, but attenuated reporter gene activation induced by a constitutively active mutant of mitogen-activated protein kinase kinase kinase 1 (MEKK1), an upstream kinase that preferentially activates JNKs, by 50%. Overexpression of JIP-1 also significantly reduced the increase in cell area in response to PE from 63% to 56%, but had no effect on the increase in cell size in response to ET-1 (38%). These results suggest that activation of the JNK pathway contributes to the transcriptional and morphological responses to G(q) receptor-coupled hypertrophic agonists.

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Selected References

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