Anti-Proliferative Properties and Proapoptotic Function of New CB2 Selective Cannabinoid Receptor Agonist in Jurkat Leukemia Cells
作者:Antonella Capozzi、Vincenzo Mattei、Stefano Martellucci、Valeria Manganelli、Giuseppe Saccomanni、Tina Garofalo、Maurizio Sorice、Clementina Manera、Roberta Misasi
DOI:10.3390/ijms19071958
日期:——
Several studies demonstrated that cannabinoids reduce tumor growth, inhibit angiogenesis, and decrease cancer cell migration. As these molecules are well tolerated, it would be interesting to investigate the potential benefit of newly synthesized compounds, binding cannabinoid receptors (CBRs). In this study, we describe the synthesis and biological effect of 2-oxo-1,8-naphthyridine-3-carboxamide derivative LV50, a new compound with high CB2 receptor (CB2R) affinity. We demonstrated that it decreases viability of Jurkat leukemia cells, evaluated by Trypan Blue and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT), but mainly induces a proapoptotic effect. We observed an increase of a hypodiploid peak by propidium iodide staining and changes in nuclear morphology by Hoechst 33258. These data were confirmed by a significant increase of Annexin V staining, cleavage of the nuclear enzyme poly(ADP-ribose)-polymerase (PARP), and caspases activation. In addition, in order to exclude that LV50 non-specifically triggers death of all normal leukocytes, we tested the new compound on normal peripheral blood lymphocytes, excluding the idea of general cytotoxicity. To characterize the involvement of CB2R in the anti-proliferative and proapoptotic effect of LV50, cells were pretreated with a specific CB2R antagonist and the obtained data showed reverse results. Thus, we suggest a link between inhibition of cell survival and proapoptotic activity of the new compound that elicits this effect as selective CB2R agonist.
多项研究表明,大麻素能降低肿瘤生长、抑制血管生成和减少癌细胞迁移。由于这些分子具有良好的耐受性,因此研究与大麻素受体(CBRs)结合的新合成化合物的潜在益处是很有意义的。在这项研究中,我们描述了 2-氧代-1,8-萘啶-3-甲酰胺衍生物 LV50 的合成和生物效应,这是一种具有高 CB2 受体(CB2R)亲和力的新化合物。通过胰蓝和 3-(4,5-二甲基噻唑-2-基)-2,5-二苯基溴化四氮唑(MTT)的评估,我们发现它能降低 Jurkat 白血病细胞的活力,但主要是诱导细胞凋亡。我们通过碘化丙啶染色和 Hoechst 33258 观察到低二倍体峰的增加以及核形态的变化。Annexin V 染色、核酶聚(ADP-核糖)聚合酶(PARP)裂解和 caspases 激活的显著增加证实了这些数据。此外,为了排除 LV50 非特异性地引发所有正常白细胞死亡的可能性,我们在正常外周血淋巴细胞上测试了这种新化合物,排除了一般细胞毒性的可能性。为了确定 CB2R 在 LV50 的抗增殖和促凋亡作用中的参与情况,我们用一种特异性 CB2R 拮抗剂对细胞进行了预处理,结果显示了相反的结果。因此,我们认为这种新化合物作为选择性 CB2R 激动剂,在抑制细胞存活和促进细胞凋亡活性之间存在联系。