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These effects were not seen in mature adult mice.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>The results of the present study demonstrate an age\u2010dependent impact of Ca<jats:sub>V<\/jats:sub>3.2 T\u2010type calcium channel deletion in rodents and suggest that the loss of Ca<jats:sub>V<\/jats:sub>3.2 channel function leads to more constricted arteries, which is a risk factor for cardiovascular disease.<\/jats:p><\/jats:list-item>\n<\/jats:list><\/jats:p><\/jats:sec><jats:sec><jats:title>Abstract<\/jats:title><jats:p>The myogenic response and flow\u2010mediated vasodilatation are important regulators of local blood perfusion and total peripheral resistance, and are known to entail a calcium influx into vascular smooth muscle cells (VSMCs) and endothelial cells (ECs), respectively. Ca<jats:sub>V<\/jats:sub>3.2 T\u2010type calcium channels are expressed in both VSMCs and ECs of small arteries. The T\u2010type channels are important drug targets but, as a result of the lack of specific antagonists, our understanding of the role of Ca<jats:sub>V<\/jats:sub>3.2 channels in vasomotor tone at various ages is scarce. We evaluated the myogenic response, flow\u2010mediated vasodilatation, structural remodelling and mRNA\u00a0+\u00a0protein expression in small mesenteric arteries from Ca<jats:sub>V<\/jats:sub>3.2 knockout (Ca<jats:sub>V<\/jats:sub>3.2KO) <jats:italic>vs<\/jats:italic>. wild\u2010type mice at a young <jats:italic>vs<\/jats:italic>. mature adult age. In young mice only, deletion of Ca<jats:sub>V<\/jats:sub>3.2 led to an enhanced myogenic response and a \u223c50% reduction of flow\u2010mediated vasodilatation. Ni<jats:sup>2+<\/jats:sup> had both Ca<jats:sub>V<\/jats:sub>3.2\u2010dependent and independent effects. No changes in mRNA expression of several important K<jats:sup>+<\/jats:sup> and Ca<jats:sup>2+<\/jats:sup> channel genes were induced by Ca<jats:sub>V<\/jats:sub>3.2KO However, the expression of the other T\u2010type channel isoform (Ca<jats:sub>V<\/jats:sub>3.1) was reduced at the mRNA and protein level in mature adult compared to young wild\u2010type arteries. The results of the present study demonstrate the important roles of the Ca<jats:sub>V<\/jats:sub>3.2 T\u2010type calcium channels in myogenic tone and flow\u2010mediated vasodilatation that disappear with ageing. Because increased arterial tone is a risk factor for cardiovascular disease, we conclude that Ca<jats:sub>V<\/jats:sub>3.2 channels, by modulating pressure\u2010 and flow\u2010mediated vasomotor responses to prevent excess arterial tone, protect against cardiovascular disease.<\/jats:p><\/jats:sec>","DOI":"10.1113\/jp271470","type":"journal-article","created":{"date-parts":[[2016,1,11]],"date-time":"2016-01-11T17:11:14Z","timestamp":1452532274000},"page":"5881-5898","source":"Crossref","is-referenced-by-count":32,"title":["Age\u2010dependent impact of Ca<sub>V<\/sub>3.2 T\u2010type calcium channel deletion on myogenic tone and flow\u2010mediated vasodilatation in small arteries"],"prefix":"10.1113","volume":"594","author":[{"given":"Miriam F.","family":"Mikkelsen","sequence":"first","affiliation":[{"name":"Department of Veterinary Clinical and Animal Sciences Faculty of Health and Medical Sciences University of Copenhagen  Copenhagen 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