G-1 is a selective and potent agonist of GPR30 with EC50 value about 2 nM [1].
G-1 treatment (10−5 and 10−4 M) for 48 and 72 h significantly decreased A549 cell proliferation, at 72 h, the IC50 value for G-1 was calculated to be 2×10−5 M [2]. G-1 treatment at a concentration of 2×10−5 M had no significant effect on CAT activity but led to a significant increase in SOD activity, GPx activity and NO level [2]. G-1 inhibited TNF-α and IL-6 release on primary human macrophages derived from monocytes treated with GM-CSF over 6 days. The agonist inhibited the induction of both cytokines with IC50 values of 209 nM and 317 nM, respectively [3]. G-1 was also able to inhibit LPS induction of TNF-α in a mouse macrophage cell line, RAW 264.7 [3].
G-1 (50 mg/kg/day, 21 days) administration significantly reduced the severity of actively induced experimental allergic encephalomyelitis (EAE). G-1 treatment reduced the qualitative degree of inflammation in the lumbar spinal cord. G-1 treatment reduced the fraction of CNS-infiltrating macrophages (CD45hiCD11b+) in three individually analyzed mice [3]. G-1 could exert protective effects on motoneurons. The intraperitoneal injection of the GPR30 agonist G-1 for 14 days induces neuroprotective effects similar with the same dose of E2 [4].
References:
[1]. Bologa C G, Revankar C M, Young S M, et al. Virtual and biomolecular screening converge on a selective agonist for GPR30[J]. Nature chemical biology, 2006, 2(4): 207-212.
[2]. Kurt A H, Çelik A, Kelleci B M. Oxidative/antioxidative enzyme-mediated antiproliferative and proapoptotic effects of the GPER1 agonist G-1 on lung cancer cells[J]. Oncology Letters, 2015, 10(5): 3177-3182.
[3]. Blasko E, Haskell C A, Leung S, et al. Beneficial role of the GPR30 agonist G-1 in an animal model of multiple sclerosis[J]. Journal of neuroimmunology, 2009, 214(1-2): 67-77.
[4]. Cheng Q, Meng J, Wang X, et al. G-1 exerts neuroprotective effects through G protein-coupled estrogen receptor 1 following spinal cord injury in mice[J]. Bioscience Reports, 2016, 36(4).