Journal
ASIAN PACIFIC JOURNAL OF CANCER PREVENTION
Volume 15, Issue 14, Pages 5873-5878Publisher
ASIAN PACIFIC ORGANIZATION CANCER PREVENTION
DOI: 10.7314/APJCP.2014.15.14.5873
Keywords
HIF-1 alpha; BNIP3; PI3KC3; metastasis; cholangiocarcinoma
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Funding
- Higher Education Research Promotion
- National Research University Project of Thailand, Office of the Higher Education Commission, through the Center of Excellence in Specific Health Problems in Greater Mekong Sub-region cluster (SHeP-GMS), Khon Kaen University
- Faculty of Medicine, Khon Kaen University [M54218, AS56202]
- Mid-Career Grant [RSA5280007]
- Thailand Research Fund
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Hypoxia and autophagy are known to facilitate tumor progression. We here aimed to investigate the role of hypoxia-associated autophagy in cholangiocarcinoma (CCA) survival and metastasis. Immunostaining of hypoxicresponsive proteins (HIF-1 alpha and BNIP3) and a key regulator of autophagy (PI3KC3) were examined in CCA tissues and their expression levels were compared with clinicopathological parameters. A hypoxia mimicking condition (CoCl2 treatment) was also tested regarding CCA cell functions. Our results showed that HIF-1 alpha (66%), BNIP3 (44%) and PI3KC3 (46%) showed strong staining in human CCA tissues. Positive expression of HIF-1 alpha (p=0.033), BNIP3 (p=0.040) and PI3KC3 (p=0.037) was significantly correlated with lymph node metastasis. HIF-1 alpha was well associated with BNIP3 (r=0.3, p<0.01) and PI3KC3 (r=0.2, p<0.01). The survival rates of patients who were positive with HIF-1 alpha (p=0.047) or co-expressed HIF-1 alpha and BNIP3 (p=0.032) or HIF-1 alpha and PI3KC3 (p=0.043) were significantly greater than in the negative groups. CCA cells treated with CoCl2 showed an increase in HIF-1 alpha, BNIP3, PI3KC3 and LC3-II, with increased cell migration and pFAK levels. These data suggest that hypoxia associated autophagy enhances CCA metastasis, resulting in a poor prognosis of CCA.
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