Li ZJ, Ying XJ, Chen HL, Ye PJ, Chen ZL, Li G, Jiang HF, Liu J, Zhou SZ. Insulin-like growth factor-1 induces lymphangiogenesis and facilitates lymphatic metastasis in colorectal cancer.
World J Gastroenterol 2013;
19:7788-7794. [PMID:
24282367 PMCID:
PMC3837280 DOI:
10.3748/wjg.v19.i43.7788]
[Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Accepted: 09/29/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the expression of insulin-like growth factor-1 (IGF-1)/insulin-like growth factor-1 receptor (IGF-1R) in colorectal cancer (CRC) tissues and to analyze their correlation with lymphangiogenesis and lymphatic metastasis.
METHODS: Immunohistochemistry was used to evaluate IGF-1 and IGF-1R expression and lymphatic vessel density (LVD) in 40 CRC specimens. The correlation between IGF-1/IGF-1R and LVD was investigated. Effects of IGF-1 on migration and invasion of CRC cells were examined using transwell chamber assays. A LoVo cell xenograft model was established to further detect the role of IGF-1 in CRC lymphangiogenesis in vivo.
RESULTS: Elevated IGF-1 and IGF-1R expression in CRC tissues was correlated with lymph node metastasis (r = 0.715 and 0.569, respectively, P < 0.05) and tumor TNM stage (r = 0.731 and 0.609, P < 0.05). A higher LVD was also found in CRC tissues and was correlated with lymphatic metastasis (r = 0.405, P < 0.05). A positive correlation was found between LVD and IGF-1R expression (r = 0.437, P < 0.05). Transwell assays revealed that IGF-1 increased the migration and invasion of CRC cells. In vivo mouse studies showed that IGF-1 also increased LVD in LoVo cell xenografts.
CONCLUSION: IGF-1/IGF-1R signaling induces tumor-associated lymphangiogenesis and contributes to lymphatic metastasis of CRC.
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