MicroRNAs can also be found in blood and other biological fluids as circulating factors lined into exosomial vesicles.
Tissue factor binds to circulating factor VIIa.
Recently, Wei et al. have described serum soluble urokinase receptor (suPAR) as a circulating factor that may cause FSGS [ 17].
Activation of PTHrP gene expression in vivo has been attributed to circulating factors as well as tumour microenvironment-derived cytokines or growth factors.
The endothelium may then, Plutzky suggested, act as transducer of circulating factors and tissue response including mechanical forces such as blood pressure, shear stress, pulsatile flow, the cellular blood components, erythrocytes, leukocytes, and platelets and circulating nutrients, particularly lipids, and toxins.
Cell-nonautonomous mechanisms, which are mediated by circulating factors as opposed to intra-cellular changes, should be readily targetable pharmacologically, hence the importance of understanding their exact mechanisms.
In principle, the utilisation of circulating factors as predictive biomarkers would appear to be more convenient than measurements requiring fresh or frozen neoplastic tissue.
There is an inconsistent relationship between soluble markers of angiogenesis and response to anti-angiogenic therapy and the practical utility of using drug-induced increases in circulating factors as surrogate biomarkers remains to be demonstrated (Sessa et al, 2008).
Adipose tissue acts as a site of energy storage, for energy production, and in secretion of circulating factors such as leptin, resistin, interleukin 6, tumor necrosis factor-α, and adiponectin.
Y4 receptors are expressed in the arcuate nucleus of the hypothalamus (ARC) [27], [28], which is accessible to circulating factors such as PP [30].
Finally, we plan to include the potential influence of circulating factors such as insulin and leptin and eventually "close the loop" by modeling the regulation of food intake in mice.
