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2015 ; 44
(4
): 636-47
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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
PMID25875801
show ga
OBJECTIVES: To further elucidate the anticancer mechanisms of metformin against
pancreatic cancer, we evaluated the inhibitory effects of metformin on pancreatic
tumorigenesis in a genetically engineered mouse model and investigated its
possible anti-inflammatory and antiangiogenesis effects. METHODS: Six-week-old
LSL-Kras;Trp53 mice (10 per group) were administered once daily intraperitoneally
with saline (control) for 1 week or metformin (125 mg/kg) for 1 week (Met_1wk) or
3 weeks (Met_3wk) before tumor initiation. All mice continued with their
respective injections for 6 weeks after tumor initiation. Molecular changes were
evaluated through quantitative polymerase chain reaction, immunohistochemistry,
and Western blotting. RESULTS: At euthanasia, pancreatic tumor volume in the
Met_1wk (median, 181.8 mm) and Met_3wk (median, 137.9 mm) groups was
significantly lower than those in the control group (median, 481.1 mm; P = 0.001
and 0.0009, respectively). No significant difference was observed between the
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 and signal transducer and
activator of transcription 3 as well as the expression of specificity protein 1
transcription factor and several nuclear factor ?B-regulated genes. CONCLUSIONS:
Metformin may inhibit pancreatic tumorigenesis by modulating multiple molecular
targets in inflammatory pathways.
|Animals
[MESH]
|Antineoplastic Agents/*pharmacology/therapeutic use
[MESH]