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Deprecated: Implicit conversion from float 229.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Pancreas 2015 ; 44 (4): 636-47 Nephropedia Template TP
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Metformin suppresses pancreatic tumor growth with inhibition of NF?B/STAT3 inflammatory signaling #MMPMID25875801
Tan XL; Bhattacharyya KK; Dutta SK; Bamlet WR; Rabe KG; Wang E; Smyrk TC; Oberg AL; Petersen GM; Mukhopadhyay D
Pancreas 2015[May]; 44 (4): 636-47 PMID25875801show ga
Objectives: To further elucidate anti-cancer mechanisms of metformin again pancreatic cancer, we evaluated inhibitory effects of metformin on pancreatic tumorigenesis in a genetically-engineered mouse model, and investigated its possible anti-inflammatory and anti-angiogenesis effects. Methods: Six-week old LSL-KrasG12D/+;Trp53F2-10 mice (10 per group) were administered once daily intraperitoneally with saline (control) for one week or metformin (125 mg/kg) for one week (Met_1wk) or three weeks (Met_3wk) prior to tumor initiation. All mice continued with their respective injections for six weeks post-tumor initiation. Molecular changes were evaluated by quantitative polymerase chain reaction (PCR), immunohistochemistry, and Western blotting. Results: At euthanasia, pancreatic tumor volume in Met_1wk (median, 181.8 mm3) and Met_3wk (median, 137.9 mm3) groups was significantly lower than the control group (median, 481.1 mm3) (P = 0.001 and 0.0009, respectively). No significant difference was observed between Met_1wk and Met_3wk groups (P = 0.51). These results were further confirmed using tumor weight and tumor burden measurements. Furthermore, metformin treatment decreased the phosphorylation of nuclear factor ?B (NF?B) and signal transducer and activator of transcription 3 (STAT3) as well as the expression of Sp1 transcription factor and several NF?B-regulated genes. Conclusions: Metformin may inhibit pancreatic tumorigenesis by modulating multiple molecular targets in inflammatory pathways.