Opposite regulation of Gax homeobox expression by angiotensin II and C- type natriuretic peptide

Jun Yamashita, Hiroshi Itoh, Yoshihiro Ogawa, Naohisa Tamura, Kazuhiko Takaya, Toshio Igaki, Kentaro Doi, Tae Hwa Chun, Mayumi Inoue, Ken Masatsugu, Kazuwa Nakao

Research output: Contribution to journalArticle

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Abstract

Growth arrest specific homeobox (Gax) gene was isolated from rat aorta cDNA library and its expression was largely confined to the cardiovascular tissues. Gax gene was rapidly downregulated by platelet-derived growth factor in vascular smooth muscle cells (VSMCs) and overexpressed Gax was reported to reduce the neointimal thickening after balloon injury in vivo. We have demonstrated that angiotensin II (Ang II) stimulates vascular growth. In contrast, we also reported that C-type natriuretic peptide (CNP) is secreted from vascular endothelial cells to act as a novel endothelium derived relaxing peptide and inhibits vascular growth via cGMP cascade. In the present study, we examined the effects of Ang II and CNP on Gax gene expression in VSMCs. In quiescent rat aortic VSMCs, Gax mRNA (2.3 kb) level became negligible 6 hours after the addition of Ang II (10-6 mol/L). The inhibitory action of Ang II on Gax mRNA expression (ED50: 10-11 mol/L) was almost completely blocked by an AT1R antagonist, CV11974. In contrast, CNP 10-6 mol/L augmented Gax mRNA expression to exhibit 1.8-fold increase of the control 12 hours after the stimulation. This effect of CNP was mimicked by the addition of 8-bromoadenosine 3':5'-cyclic monophosphate. The addition of C-ANF[4-23], an atrial natriuretic peptide-C receptor-specific agonist and devoid of stimulating cGMP production, exhibited no effect on Gax mRNA expression. Simultaneous administration of Ang II and CNP revealed that CNP (10-6 mol/L) significantly attenuated the inhibitory action of Ang II (10-10 mol/L) on Gax mRNA expression. These results suggest that Gax is a common transcription factor involved in the signaling pathway of vascular growth for Ang II and CNP and regulates the cell cycle and/or phenotype of VSMCs for vascular remodeling in hypertension and atherosclerosis.

Original languageEnglish
Pages (from-to)381-387
Number of pages7
JournalHypertension
Volume29
Issue number1 II
Publication statusPublished - Jan 1 1997

Fingerprint

C-Type Natriuretic Peptide
Homeobox Genes
Angiotensin II
Vascular Smooth Muscle
Smooth Muscle Myocytes
Messenger RNA
Blood Vessels
Growth
Atrial Natriuretic Factor Receptors
Platelet-Derived Growth Factor
Gene Library
Endothelium
Aorta
Atherosclerosis
Cell Cycle
Transcription Factors
Down-Regulation
Endothelial Cells
Hypertension
Phenotype

All Science Journal Classification (ASJC) codes

  • Internal Medicine

Cite this

Yamashita, J., Itoh, H., Ogawa, Y., Tamura, N., Takaya, K., Igaki, T., ... Nakao, K. (1997). Opposite regulation of Gax homeobox expression by angiotensin II and C- type natriuretic peptide. Hypertension, 29(1 II), 381-387.

Opposite regulation of Gax homeobox expression by angiotensin II and C- type natriuretic peptide. / Yamashita, Jun; Itoh, Hiroshi; Ogawa, Yoshihiro; Tamura, Naohisa; Takaya, Kazuhiko; Igaki, Toshio; Doi, Kentaro; Chun, Tae Hwa; Inoue, Mayumi; Masatsugu, Ken; Nakao, Kazuwa.

In: Hypertension, Vol. 29, No. 1 II, 01.01.1997, p. 381-387.

Research output: Contribution to journalArticle

Yamashita, J, Itoh, H, Ogawa, Y, Tamura, N, Takaya, K, Igaki, T, Doi, K, Chun, TH, Inoue, M, Masatsugu, K & Nakao, K 1997, 'Opposite regulation of Gax homeobox expression by angiotensin II and C- type natriuretic peptide', Hypertension, vol. 29, no. 1 II, pp. 381-387.
Yamashita J, Itoh H, Ogawa Y, Tamura N, Takaya K, Igaki T et al. Opposite regulation of Gax homeobox expression by angiotensin II and C- type natriuretic peptide. Hypertension. 1997 Jan 1;29(1 II):381-387.
Yamashita, Jun ; Itoh, Hiroshi ; Ogawa, Yoshihiro ; Tamura, Naohisa ; Takaya, Kazuhiko ; Igaki, Toshio ; Doi, Kentaro ; Chun, Tae Hwa ; Inoue, Mayumi ; Masatsugu, Ken ; Nakao, Kazuwa. / Opposite regulation of Gax homeobox expression by angiotensin II and C- type natriuretic peptide. In: Hypertension. 1997 ; Vol. 29, No. 1 II. pp. 381-387.
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