Vascular Hypertrophy and Hypertension Caused by Transgenic Overexpression of Profilin 1

We have overexpressed either the cDNA of human profilin 1 or expressed the mutant (88R/L) in the blood vessels of transgenic FVB/N mice. Reverse transcription-PCR indicated selective overexpression of profilin 1 and 88R/L in vascular smooth muscle cells. Polyproline binding showed increased profilin...

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Bibliographic Details
Published in:The Journal of biological chemistry 2007-12, Vol.282 (52), p.37632-37639
Main Authors: Moustafa-Bayoumi, Moustafa, Alhaj, Mazin A., El-Sayed, Osama, Wisel, Sheik, Chotani, Maqsood A., Abouelnaga, Zeinb A., Hassona, Mohamed D.H., Rigatto, Katya, Morris, Mariana, Nuovo, Gerard, Zweier, Jay L., Goldschmidt-Clermont, Pascal, Hassanain, Hamdy
Format: Article
Language:English
Subjects:
Actins - chemistry
Animals
Aorta - metabolism
Aortic Valve - cytology
Blood Pressure
Gene Expression Regulation
Hypertension - genetics
Hypertrophy - genetics
MAP Kinase Signaling System
Mice
Mice, Transgenic
Mitogen-Activated Protein Kinase 1 - metabolism
Mitogen-Activated Protein Kinase 3 - metabolism
Models, Biological
Myocytes, Smooth Muscle - cytology
Profilins - biosynthesis
Profilins - genetics
Signal Transduction
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Summary:We have overexpressed either the cDNA of human profilin 1 or expressed the mutant (88R/L) in the blood vessels of transgenic FVB/N mice. Reverse transcription-PCR indicated selective overexpression of profilin 1 and 88R/L in vascular smooth muscle cells. Polyproline binding showed increased profilin 1 and 88R/L proteins in transgenic mice compared with control (∼30%, p < 0.05). Rhodamine-phalloidin staining revealed increase stress fiber formation in vascular smooth muscle cells of profilin 1 compared with 88R/L and control. Hematoxylin and eosin staining showed clear signs of vascular hypertrophy in the aorta of profilin 1 mice versus 88R/L and control. However, there were no differences between 88R/L and control mice. Western blotting confirmed the activation of the hypertrophic signaling cascades in aortas of profilin 1 mice. Phospho-ERK1/2 was significantly higher in profilin 1 than 88R/L and control (512.3 and 361.7%, respectively, p < 0.05). Profilin 1 mice had significant increases in phospho-JNK as compared with 88R/L and control (371.4 and 346%, respectively, p < 0.05). However, there were no differences between 88R/L and control mice in both kinases. There was a significant increase in ROCK II kinase in the aorta of profilin 1 mice compared with controls (>400%, p < 0.05). Tail cuff and circadian monitoring of blood pressure showed significant increases in systolic and mean arterial blood pressures of profilin 1 mice starting at age 6 months compared with controls (∼25 mm Hg, p < 0.05). These results suggest that increased actin polymerization in blood vessels triggers activation of the hypertrophic signaling cascades and results in elevation of blood pressure at advanced age.
ISSN:0021-9258
1083-351X
DOI:10.1074/jbc.M703227200