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Aromatic organic compounds that consist of an aromatic six-membered ring containing two non-adjacent nitrogen atoms and four carbon atoms; includes compounds derived from pyrimidines.
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Camptothecin (CAS 7689-03-4) is a small molecule inhibitor that selectively targets topoisomerase I exhibiting an IC50 value of 679 nM It causes DNA damage evident by phosphorylation of histone H2AX ( H2AX) leading to tumor cell death and cellular senescence via the ATM-Chk2-p53-p21 signaling pathway Additionally camptothecin induces autophagy through activation of the AMPK-TSC2-mTOR pathway Preclinical studies demonstrate its anti-tumor activity against tumor cell lines such as SMMC-7721 MCF-7 HCT-116 and NSCLC xenografts underscoring its utility in cancer biology research
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Rofecoxib (CAS 162011-90-7) is a selective inhibitor of cyclooxygenase-2 (COX-2) designed to provide anti-inflammatory effects with improved gastrointestinal tolerance compared to non-selective NSAIDs It demonstrates potent inhibition of COX-2 in cell-based assays with IC50 values ranging from 18 to 46 nM In osteosarcoma cells Rofecoxib suppresses prostaglandin E2 (PGE2) synthesis (IC50 26 nM) and inhibits recombinant human COX-2 in stably transfected CHO cells (IC50 18 nM) In biochemical assays using purified human COX-2 the IC50 is 0 34 M In vivo Rofecoxib reduces carrageenan-induced edema and hyperalgesia in rats (ID50 1 1 5 mg/kg) It is widely used in studies investigating COX-2-mediated inflammatory pathways and analgesia
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