g protein antagonist peptide

Substance P-related peptide that inhibits binding of G proteins to their receptors. Competitively and reversibly inhibits M2 muscarinic receptor activation of Gi or Go and inhibits Gs activation by β-adrenoceptors.

G-Protein antagonist peptide acetate 是一种 substance P 相关肽，可抑制 G 蛋白与其受体的结合。G-Protein antagonist peptide acetate 竞争性和可逆性地抑制毒蕈碱型乙酰胆碱受体 M2 (M2 muscarinic receptor) 对 Gi 或 Go 的激活，并通过 β-肾上腺素受体抑制 Gs 的激活。

Kisspeptin-54 is a peptide ligand of the orphan G protein-coupled receptor GPR54 (Kis = 1.81 and 1.45 nM for rat and human receptors, respectively).1 It is a 54 amino acid peptide encoded by the metastasis suppressor gene KISS-1. Kisspeptin-54 induces calcium mobilization in CHO-K1 cells expressing rat and human receptors (EC50s = 1.39 and 5.47 nM, respectively). It also induces arachidonic acid release in CHO cells expressing rat and human GPR54 in a concentration-dependent manner. Kisspeptin-54 (10-1,000 nM) inhibits insulin secretion from isolated mouse pancreatic β-cells in the presence of 2.8 mM, but not 11.1 mM, glucose.2 Kisspeptin-54 (1-5 nmol, i.c.v.) increases serum levels of luteinizing hormone (LH) and follicular stimulating hormone (FSH) in mice, an effect which is reversed by the gonadotropin releasing hormone (GNRH) antagonist acycline.3References1. Kotani, M., Detheux, M., Vandenbogaerde, A.L., et al. The metastasis suppressor gene KiSS-1 encodes kisspeptins, the natural ligands of the orphan G protein-coupled receptor GPR54. J. Biol. Chem. 276(37), 34631-34636 (2001).2. Vikman, J., and Ahrén, B. Inhibitory effect of kisspeptins on insulin secretion from isolated mouse islets. Diabetes Obes. Metab. 11(Suppl 4), 197-201 (2009).3. Gottsch, M.L., Cunningham, M.J., Smith, J.T., et al. A role for kisspeptins in the regulation of gonadotropin secretion in the mouse. Endocrinology 145(9), 4073-4077 (2004). Kisspeptin-54 is a peptide ligand of the orphan G protein-coupled receptor GPR54 (Kis = 1.81 and 1.45 nM for rat and human receptors, respectively).1 It is a 54 amino acid peptide encoded by the metastasis suppressor gene KISS-1. Kisspeptin-54 induces calcium mobilization in CHO-K1 cells expressing rat and human receptors (EC50s = 1.39 and 5.47 nM, respectively). It also induces arachidonic acid release in CHO cells expressing rat and human GPR54 in a concentration-dependent manner. Kisspeptin-54 (10-1,000 nM) inhibits insulin secretion from isolated mouse pancreatic β-cells in the presence of 2.8 mM, but not 11.1 mM, glucose.2 Kisspeptin-54 (1-5 nmol, i.c.v.) increases serum levels of luteinizing hormone (LH) and follicular stimulating hormone (FSH) in mice, an effect which is reversed by the gonadotropin releasing hormone (GNRH) antagonist acycline.3 References1. Kotani, M., Detheux, M., Vandenbogaerde, A.L., et al. The metastasis suppressor gene KiSS-1 encodes kisspeptins, the natural ligands of the orphan G protein-coupled receptor GPR54. J. Biol. Chem. 276(37), 34631-34636 (2001).2. Vikman, J., and Ahrén, B. Inhibitory effect of kisspeptins on insulin secretion from isolated mouse islets. Diabetes Obes. Metab. 11(Suppl 4), 197-201 (2009).3. Gottsch, M.L., Cunningham, M.J., Smith, J.T., et al. A role for kisspeptins in the regulation of gonadotropin secretion in the mouse. Endocrinology 145(9), 4073-4077 (2004).

Proadrenomedullin N-terminal 12 peptide (PAMP-12) 是一种内源性肽段，源自人体肾上腺髓质，对应人类PAMP-20的9-20氨基酸，涉及降低血压。它是MAS相关G蛋白偶联受体家族成员X2 (MRGPRX2) 的激动剂。在表达人MRGPRX2的CHO细胞中，PAMP-12抑制forskolin诱导的cAMP积累（EC50 = 57.2 nM），特异性诱导表达MRGPRX2的CHO细胞的钙离子动员（EC50 = 41 nM），而在表达MRGPRX1、MRGPRX3或MRGPRX4的细胞中则无此效应（在1 µM浓度下）。PAMP-12还能作为烟碱型乙酰胆碱受体（nAChRs）的拮抗剂，抑制carbachol诱导的儿茶酚胺释放（IC50 = 1.3 µM）及钙和钠的流入（IC50分别为0.39 µM和0.87 µM），但不抑制组胺诱导的儿茶酚胺释放或钙和钠的流入（IC50 >1 µM），在初级牛肾上腺嗜铬细胞中有此表现。当以10至50 nmol/kg剂量给予正常血压大鼠时，PAMP-12能降低平均动脉血压。

QWF acetate 是一种 Substance P 拮抗剂，能够特异性地抑制 Substance P 与其受体（NK1）的结合，IC50 为 0.09 Μm；还可以抑制 Mas 相关 G 蛋白偶联受体 X2（MRGPRX2）的激活，从而抑制肥大细胞的脱颗粒，QWF醋酸盐作为多肽在疼痛、炎症和过敏反应的研究中具有重要应用。