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Journal: International Journal of Molecular Sciences
Article Title: Regulation of Cisplatin Resistance in Lung Cancer Cells by Nicotine, BDNF, and a β-Adrenergic Receptor Blocker
doi: 10.3390/ijms232112829
Figure Lengend Snippet: Phospho/Total IGF-1R ratio increased by cell treatment with epinephrine or nicotine and decreased by cell treatment with propranolol, while blocking IGF-1R activation by PPP increased cell sensitivity to cisplatin. ( A ) Cells (0.2 × 10 5 ) were grown in 10% FBS-supplemented media for 24 h. The following day, the cell monolayers were incubated in serum-free media for 24 h (Control), then incubated without or with FBS for 72 h. The phospho/total IGF-1R assay ( A ) was carried out on the same amount of protein (25 µL of 400 µg/mL total protein) of the cell lysate as described in the Methods section. The phospho/total IGF-1R assay was also carried out on A549 and H1299 cells grown as above then incubated in serum-free media for 72 h in the absence or presence of epinephrine (Epi, 100 nM), propranolol (Prop, 1 µM), nicotine (Nic, 1 µM), BDNF (5 nM), PPP (5 µM) or in combination without ( B , C ) or with cisplatin ( D , E ). Cell viability ( F ) and apoptosis ( G ) were determined in the presence of PPP (5 µM) without or with 10 µM cisplatin when using A549 cells and 30 µM cisplatin when using H1299 cells, as described in the Methods section. Data from five independent assays, each carried out in triplicate, were averaged, normalized, and expressed as fold change relative to untreated control cells (Control) using the GraphPad 9.4.1 software. The graphs summarize the results expressed as means ± SD (n = 5). Asterisks (*) indicate a statistically significant difference from the corresponding control for each cell line, Mann–Whitney test, while the absence of asterisks indicates no significance. * p < 0.05, ** p < 0.01.
Article Snippet: Activated (phosphorylated) IGF-1R was quantitated using the
Techniques: Blocking Assay, Activation Assay, Incubation, Software, MANN-WHITNEY