PKN2 deficiency leads both to prenatal congenital cardiomyopathy and defective angiotensin II stress responses

Marshall, J. J. T., Cull, J. J., Alharbi, H. O., Zaw Thin, M., Cooper, S. T. E., Barrington, C., Vanyai, H., Snoeks, T., Siow, B., Suáarez-Bonnet, A., Herbert, E., Stuckey, D. J., Cameron, A. J. M., Prin, F., Cook, A. C., Priestnall, S. L., Chotani, S., Rackham, O. J. L., Meijles, D. N., Mohun, T., Clerk, A. ORCID: https://orcid.org/0000-0002-5658-0708 and Parker, P. J. (2022) PKN2 deficiency leads both to prenatal congenital cardiomyopathy and defective angiotensin II stress responses. Biochemical Journal, 479 (13). pp. 1467-1486. ISSN 1470-8728 doi: 10.1042/BCJ20220281

Abstract/Summary

The protein kinase PKN2 is required for embryonic development and PKN2 knockout mice die as a result of failure in expansion of mesoderm, cardiac development and neural tube closure.  In the adult, cardiomyocyte PKN2 and PKN1 (in combination) are required for cardiac adaptation to pressure-overload.  The specific role of PKN2 in contractile cardiomyocytes during development and its role in the adult heart remain to be fully established. We used mice with cardiomyocyte-directed knockout of PKN2 or global PKN2 haploinsufficiency to assess cardiac development and function using high resolution episcopic microscopy, MRI, micro-CT and echocardiography.  Biochemical and histological changes were also assessed.  Cardiomyocyte-directed PKN2 knockout embryos displayed striking abnormalities in the compact myocardium, with frequent myocardial clefts and diverticula, ventricular septal defects and abnormal heart shape. The sub-Mendelian homozygous knockout survivors developed cardiac failure. RNASeq data showed upregulation of PKN2 in patients with dilated cardiomyopathy, suggesting an involvement in adult heart disease.  Given the rarity of homozygous survivors with cardiomyocyte-specific deletion of PKN2, the requirement for PKN2 in adult mice was explored using the constitutive heterozygous PKN2 knockout.  Cardiac hypertrophy resulting from hypertension induced by angiotensin II was reduced in these haploinsufficient PKN2 mice relative to wild-type littermates, with suppression of cardiomyocyte hypertrophy and cardiac fibrosis. It is concluded that cardiomyocyte PKN2 is essential for heart development and formation of compact myocardium and is also required for cardiac hypertrophy in hypertension.  Thus, PKN signalling may offer therapeutic options for managing congenital and adult heart diseases.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/105889
Item Type	Article
Refereed	Yes
Divisions	Life Sciences > School of Biological Sciences > Biomedical Sciences
Publisher	Portland Press
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