ABSTRACT
T790M mutation is the most common mechanism of acquired resistance to first-generation epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs). To overcome this resistance, 4-anilinoquinazoline-based irreversible inhibitors afatinib, dacomitinib has been developed. However, the clinical application of these irreversible inhibitors is limited due to its narrow selectivity against L858R/T790M mutant EGFR. In an attempt to develop potent and selective EGFR T790M inhibitors, we have designed and synthesized two series of novel acrylamide linked quinazolines. Among them, compounds 2i (IC50 0.171 µM) and 11h (IC50 0.159 µM) were identified as potent compounds, which displayed selective and potent anti-proliferative activity on gefitinib-resistant cell line NCI-H1975 as compared to the gefitinib and WZ4002 in cellular assay. Furthermore, a molecular dynamic simulation of 11h was carried out to assess the stability to form a complex with the L858R/T790M EGFR Kinase domain, which demonstrated that complex was stable for the 100 ns and form strong crucial covalent binding contacts with the thiol group of Cys797 residue. Finally, satisfactory in silico pharmacokinetics properties of 2i, 11h and 11i compounds were predicted. The synthesized compounds were also evaluated for in vitro cytotoxic activity/hepatotoxicity against HepG2 cell line through MTT assay. The results revealed that compounds exhibited lower cytotoxicity to HepG2 cells.
Subject(s)
Acrylamide/pharmacology , Antineoplastic Agents/pharmacology , Carcinoma, Non-Small-Cell Lung/drug therapy , Lung Neoplasms/drug therapy , Protein Kinase Inhibitors/pharmacology , Quinazolines/pharmacology , Acrylamide/chemistry , Antineoplastic Agents/chemical synthesis , Antineoplastic Agents/chemistry , Carcinoma, Non-Small-Cell Lung/metabolism , Carcinoma, Non-Small-Cell Lung/pathology , Cell Line, Tumor , Cell Proliferation/drug effects , Dose-Response Relationship, Drug , Drug Screening Assays, Antitumor , ErbB Receptors/antagonists & inhibitors , ErbB Receptors/metabolism , Humans , Lung Neoplasms/metabolism , Lung Neoplasms/pathology , Molecular Structure , Protein Kinase Inhibitors/chemical synthesis , Protein Kinase Inhibitors/chemistry , Quinazolines/chemistry , Structure-Activity RelationshipABSTRACT
Objective: To investigate the effect of aloin against chronic constriction injury (CCI)-induced neuropathic pain in rats. Methods: Rats were randomly divided into 7 groups: Group Ⅰ (normal control), Group Ⅱ (sham-operated), Group Ⅲ (CCI control) and Group Ⅳ, Ⅴ, Ⅵ, and Ⅶ, which underwent CCI surgery and then were administered with aloin (5 mg/kg, p.o.; 25 mg/kg, p.o.; 125 mg/kg, p.o.) and gabapentin (50 mg/kg, p.o.), respectively for 14 days. Peripheral neuropathy was induced by silk ligatures (4-0) loosely placed around the sciatic nerve. Nociceptive thresholds against mechanical stimuli (Von-Frey filaments) and thermal stimuli (12 ℃ and 40 ℃) were measured at mid-plantar paw region ipsilateral to the compressed nerve on day-3, 7, 11, and 14. The concentration of cytokines including tumor necrosis factor-α (TNF-α), interleukin-6, and interleukin-1β was estimated at day-7. At day 14, motor nerve conduction velocity was determined under urethane anesthesia (1.25 g/kg). Oxidative stress parameters (malondiadehyde, glutathione, catalase, and superoxide dismutase) were estimated in sciatic nerve homogenates at day 14. Representative nerve samples were processed for histological investigations. Results: Aloin significantly reduced CCI-induced mechanical and thermal allodynia. It also improved motor nerve conduction velocity and decreased oxidative stress in nerve tissues. In addition, it decreased pro-inflammatory cytokine levels and restored the histoarchitecture of compressed sciatic nerve. Conclusions: Aloin mitigates CCI-induced neuropathic pain in rats by inhibiting oxidative stress and pro-inflammatory cytokines in the afflicted sciatic nerve.
