Endothelial KATP channels, for example, contribute to shear stress-induced endothelial release of the vasodilator nitric oxide in rabbit aorta [ 37] and may also mediate vasodilation in response to hyperosmolarity or acidosis in the coronary microvasculature [ 38, 39].
Mechanistically, Premer et al. show that MSCs can improve flow mediated vasodilation in their cohorts of patient while reducing the circulating VEGF to normal levels and increasing circulating endothelial progenitors.
Although in young adults, the insulin mediated vasodilation is greater in women than in men [56], there is evidence for a greater decline with aging in women compared with men in endothelium dependent dilation induced pharmacologically or by hypoxia [57] [59], which may abolish this difference at a more advanced age or even result in reduced flow in women.
This reaction releases nitric oxide (NO·) (Fig. 1), an important gas that mediates vasodilation and is involved in numerous other functions, such as the immune response against parasites [32].
Nitric-oxide is known to mediate vasodilation and rapidly induce alterations in blood flow (Moncada et al, 1991).
NO, produced by endothelial cells from l-arginine via NO synthase, mediates vasodilation in both pulmonary and systemic vascular beds (Ikeda et al. 1995; Joannides et al. 1995).
17, 18 α1-Adrenergic receptor antagonists also mediate vasodilation in the vasculature; therefore, one of the side effects of treating LUTS with α1-adrenergic receptor antagonists is hypotension.
In erectile tissue, both alpha-1 and alpha-2 and beta-2 adrenoceptors are expressed, and they probably mediate vasodilation in response to the increase in adrenaline during erection [ 27].
These outcomes included flow mediated vasodilation, increased propensity of circulating endothelial progenitors to form colonies, in-vitro, and MSC mediated decreased circulating VEGF.
The NO produced by eNOS results in calcium dependent cyclic guanosine monophosphate (cGMP) mediated vasodilation to maintain vascular tone of cerebral blood vessels.
