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https://www.selleckchem.com/products/k-ras-g12c-inhibitor-12.html Cyclic AMP (cAMP) signaling is activated by various hormones and neurotransmitters and regulates numerous physiological phenomena, including energy metabolism, gene expression, and proliferation. cAMP signaling plays a role in the repair of DNA damage, but its specific function is inconsistent in the literature. The present study aimed to investigate the mechanism of the different roles of cAMP signaling in DNA repair by analyzing the cell-type differences in the modulation of DNA repair by cAMP signaling following γ-ray irradiation. cAMP signaling was activated in human malignant melanoma cells (SK-MEL-2 and SK-MEL-28), human uterine cervical cancer cells (HeLa and SiHa) and human non-small cell lung cancer cells (H1299 and A549) by expressing a constitutively active mutant of the long-form stimulatory α subunit of GTP-binding protein or by treating with isoproterenol and prostaglandin E2 before γ-ray irradiation. DNA damage was quantitated by western blot analysis of γ-H2AX, and non-homologous end joiniA damage in melanoma cells, uterine cervical cancer cells and lung cancer cells in a cell-type-specific manner, and the modulation is likely mediated by protein kinase A-dependent phosphorylation of DNA-PKcs. This study suggests that cell- and tissue-specific modulation of DNA damage repair by cAMP signaling may contribute to improve the therapeutic efficiency of radiation therapy.Ligustrum robustum (Roxb.) Blume is utilized as a traditional Chinese herbal tea with various health benefits and protective effects. Streptococcus mutans is an important cariogenic oral bacteria species. The present study aimed to assess the influence of Ligustrum robustum extract (LRE) on the biofilm formation of S. mutans and the mechanism of its action, as well as to identify its chemical components. For chemical identification, HPLC-MS and nuclear magnetic resonance were applied and four identified phytochemicals were r

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