6), the failure see more of Coa_NP2 to relax aortic rings precontracted with 80 mM potassium suggested a possible role for voltage-dependent ion channels that may include potassium channels; however, the primary mediator could be calcium influx, which activates a calcium-activated potassium
channel and/or NO release . Supporting this affirmation, the potassium-channel blocker, tetraethylammonium has been found to reduce the BNP-induced dilatation of brachial humans arteries . As such, our findings demonstrate that the hypotension and vasodilatation caused by Coa_NP2 is consistent with the hypothesis that both NPR-B pathways activate and stimulate NO production in parallel. In conclusion, we isolated and characterized a new NP-like peptide from C. o. abyssus venom (Coa_NP2), and we also report a dose-dependent hypotensive effect of this peptide in association with increased nitrite production, as well as vasodilatory endothelium-dependent effects. Therefore, these data suggest that the NO-release dependent vasodilator action of Coa_NP2 may occur by stimulation of potassium channels. The authors report no conflicts of interest in this work. We would like to thank CAPES, CNPq, FAPEMIG and FAPESP (Brazilian agencies)
for financial support. “
“The authors regret for the error in Peptides 33 (2012), p. 207, Section 2.4. using the Triple TOF 5600 TOF MS Analyzer (Applied Biosystems)”
is corrected into “using the Triple ToF 5600 (AB Sciex). The authors selleck screening library would like to apologise for any inconvenience caused. “
“Collagens are characterized by the triple-helical structure resulting from the presence of repeating GXX’ triplets, where G is glycine, X is commonly proline (P), and X′ is commonly hydroxyproline (O). The fibrillar collagens I and II, whose Docetaxel ic50 main triple-helical domains comprise 338 such triplets, are the fundamental scaffolds of the extracellular matrix in bone, tendon (type I), and cartilage (type II)  and . In blood vessel walls and skin, collagen I is interlaced with collagen III, having a 343-triplet helix, whereas non-fibrillar collagen IV networks form basal laminae in structures such as kidney glomeruli, lung alveoli, and blood vessel walls . These collagens, along with the 24 other known collagen types, are widely distributed. Accordingly, a large repertoire of proteins bind to the collagens, including structural components of the extracellular matrix as well as cell receptors that mediate physiological processes such as cell migration, hemostasis, and wound healing. In 1995, Barnes developed a platelet-reactive model peptide, a GPO polymer now called collagen-related peptide (CRP)  which proved to bind the immune receptors, platelet Glycoprotein VI (GpVI)  and  and leukocyte-associated immunoglobulin-like receptor-1 (LAIR-1) .