Distribution of cGMP-dependent and cGMP-independent Ca2+-activated Cl− conductances in smooth muscle cells from different vascular beds and colon
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Abstract
In the present patch-clamp study we have, for the first time, shown the tissue distribution of a recently characterized cGMP-dependent Ca2+-activated Cl− conductance [18] in smooth muscle cells freshly isolated from different regions: aorta, pulmonary artery, tail artery, femoral artery, femoral vein, middle cerebral artery, renal artery, portal vein, superior mesenteric artery, mesenteric small artery and colon. The cGMP-dependent Cl− conductance has properties distinct from those of the ‘classical’ Ca2+-activated Cl− conductances; their different sensitivities to niflumic acid and zinc were here utilized to distinguish them. They were found to be co-expressed in different patterns in smooth muscle cells of different origins. The cGMP-dependent conductance was greater in myocytes from cerebral artery and femoral vein and was greater in the renal artery, aorta, mesenteric small artery, femoral artery and the superior mesenteric artery. The presence of the cGMP-dependent Ca2+-activated Cl− current in smooth muscle cells isolated from the colon demonstrates that this conductance is not limited to the vasculature. The ‘classical’ Ca2+-activated Cl− conductance was strongly expressed in smooth muscle cells from the portal vein and the tail artery, and noticeably higher in the pulmonary artery.
Keywords
Smooth muscle Blood vessel Colon Chloride channel cGMP Niflumic acid Zinc Intracellular calciumNotes
Acknowledgements
The work was supported by the Danish Heart Foundation. The Water and Salt Research Center at the University of Aarhus is established and supported by the Danish National Research Foundation (Danmarks Grundforskningsfond).
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