MODULATION OF PROTEIN KINASE C (PKC)-MEDIATED CONTRACTION AND THE POSSIBLE ROLE OF PKCepsilon IN RAT MESENTERIC ARTERIES
| Autor: | Yuichi Shirasawa, David A. Dean, Travis J Rutland, Benoit N Joseph, Jennifer L. Young |
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| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
Male
medicine.medical_specialty Contraction (grammar) Protein Kinase C-epsilon chemistry.chemical_element Biology Calcium Transfection Article Gene Expression Regulation Enzymologic Muscle Smooth Vascular Rats Sprague-Dawley chemistry.chemical_compound Phenylephrine Alkaloids Internal medicine Isometric Contraction medicine Animals Mesenteric arteries Protein kinase C Protein Kinase C Benzophenanthridines Gene Transfer Techniques Mesenteric Arteries Phenanthridines Rats Isoenzymes Endocrinology Chelerythrine medicine.anatomical_structure Biochemistry chemistry Mutation medicine.symptom Muscle contraction medicine.drug Muscle Contraction |
| Popis: | he involvement of protein kinase C (PKC) in isometric tension development of rat mesenteric arteries was investigated. Non-selective inhibition of PKC and selective inhibition of the epsilon isoform were performed using the PKC inhibitor, chelerythrine, and non-viral gene-transfer of a kinase inactive mutant of PKCepsilon (PKCepsilon-KN), respectively. Chelerythrine (2.5 or 5.0 microM) significantly and equally attenuated phenylephrine-induced but not potassium-induced contractions. Higher concentrations of chelerythrine (10 microM) caused the vessels to lose responsiveness to both phenylephrine and potassium chloride. Transfection of blood vessels with epsilon-KN also resulted in significant attenuation of contractile responses to phenylephrine. Potassium chloride-induced responses were not altered in transfected arteries. In a separate group of vessels, the relationship between [Ca2+]i and isometric tension was evaluated. These studies suggested that calcium sensitivity of the contractile apparatus was decreased in vessels when PKC-epsilon activity was compromised. The results of the study suggest that PKC-epsilon can modulate phenylephrine-induced contraction in mesenteric arteries via calcium-independent pathways. |
| Databáze: | OpenAIRE |
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