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Protein kinase C isoforms in human aortic smooth muscle cells
J J Grange1, L M Baca-Regen, A J Nollendorfs
1Department of Surgery, University of Nebraska Medical Center, Omaha 68198-3280, USA.
Journal of Vascular Surgery
|June 10, 1998
Summary
Human arterial smooth muscle cells (SMC) express specific protein kinase C (PKC) isoforms, with alpha and betaI translocating upon stimulation, differing from animal models.
Area of Science:
- Cellular Biology
- Molecular Biology
- Biochemistry
Background:
- Protein kinase C (PKC) plays a crucial role in cellular signaling pathways.
- Understanding PKC isoform localization is vital for elucidating cellular regulation in vascular tissues.
Purpose of the Study:
- To identify protein kinase C (PKC) isoforms in human arterial smooth muscle cells (SMC).
- To determine the subcellular localization of these PKC isoforms in resting and stimulated states.
- To investigate the effect of 12-O-tetradecanoylphorbol 13-acetate (TPA) on PKC isoform translocation.
Main Methods:
- Human arterial SMC cultures were treated with TPA or control media.
- PKC isoforms were separated into soluble and particulate fractions via centrifugation.
- Immunoblots and immunofluorescent staining were used to detect and localize PKC isoforms (alpha, betaI, betaII, delta, epsilon, gamma, zeta).
Main Results:
- PKC isoforms alpha and betaI were primarily soluble, translocating to the particulate fraction upon TPA stimulation.
- Isoforms betaII, delta, and epsilon were predominantly in the particulate fraction and did not translocate.
- PKC isoforms gamma and zeta were not detected in human arterial SMC.
Conclusions:
- Human arterial SMC express a distinct set of PKC isoforms compared to animal models.
- The specific localization and TPA-induced translocation of PKC isoforms suggest unique functional roles.
- These findings provide a basis for investigating PKC's role in vascular disease and matrix metabolism.