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Review

The insulin-like growth factor (IGF) signaling axis and hepatitis C virus-associated carcinogenesis (Review)

  • Authors:
    • Aldona Kasprzak
    • Agnieszka Adamek
  • View Affiliations / Copyright

    Affiliations: Department of Histology and Embryology, University of Medical Sciences, 60-781 Poznań, Poland , Department of Infectious Diseases, University of Medical Sciences, 61-285 Poznań, Poland
  • Pages: 1919-1931
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    Published online on: October 16, 2012
       https://doi.org/10.3892/ijo.2012.1666
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Abstract

Insulin-like growth factor (IGF) signaling plays an important autocrine, paracrine and endocrine role in growth promotion involving various tissues and organs. Synthesis of both IGFs (IGF-1 and IGF-2) in normal conditions takes place mainly in the liver even if the proteins can be produced in every cell of the human body. The alterations in the IGF signaling axis in human hepatocarcinogenesis are described, but mechanisms of the interactions between expression of oncogenic hepatitis C virus (HCV) proteins and components of the IGF system in progression of chronic hepatitis C to primary hepatocellular carcinoma (HCC) have been poorly recognised. In advanced stages of liver diseases, lowered serum levels of IGF-1 and IGF-2 have been documented. This was supposed to reflect significant damage to liver parenchyma, a decreased number of growth hormone receptors and a decreased genomic expression of IGF binding proteins (IGF BPs). In HCC, a decreased tissue expression of IGF-1, and an increased expression of IGF-1 receptor (IGF-1R) were noted, compared to the control. Potential mechanisms of augmented IGF-2 expression in HCC were also described and dysregulation of IGF signaling in HCC was concluded to occur predominantly at the level of IGF-2 bioavailability. The review aimed at presentation of involvement of IGF-1, IGF-1R and IGF BPs (mostly IGF BP-3 and IGF BP-6) in HCV-related hepatocarcinogenesis. Manifestation of various mRNA transcripts and IGF-1 proteins and their potential involvement in carcinogenesis are also discussed.
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Copy and paste a formatted citation
Spandidos Publications style
Kasprzak A and Adamek A: The insulin-like growth factor (IGF) signaling axis and hepatitis C virus-associated carcinogenesis (Review). Int J Oncol 41: 1919-1931, 2012.
APA
Kasprzak, A., & Adamek, A. (2012). The insulin-like growth factor (IGF) signaling axis and hepatitis C virus-associated carcinogenesis (Review). International Journal of Oncology, 41, 1919-1931. https://doi.org/10.3892/ijo.2012.1666
MLA
Kasprzak, A., Adamek, A."The insulin-like growth factor (IGF) signaling axis and hepatitis C virus-associated carcinogenesis (Review)". International Journal of Oncology 41.6 (2012): 1919-1931.
Chicago
Kasprzak, A., Adamek, A."The insulin-like growth factor (IGF) signaling axis and hepatitis C virus-associated carcinogenesis (Review)". International Journal of Oncology 41, no. 6 (2012): 1919-1931. https://doi.org/10.3892/ijo.2012.1666
Copy and paste a formatted citation
x
Spandidos Publications style
Kasprzak A and Adamek A: The insulin-like growth factor (IGF) signaling axis and hepatitis C virus-associated carcinogenesis (Review). Int J Oncol 41: 1919-1931, 2012.
APA
Kasprzak, A., & Adamek, A. (2012). The insulin-like growth factor (IGF) signaling axis and hepatitis C virus-associated carcinogenesis (Review). International Journal of Oncology, 41, 1919-1931. https://doi.org/10.3892/ijo.2012.1666
MLA
Kasprzak, A., Adamek, A."The insulin-like growth factor (IGF) signaling axis and hepatitis C virus-associated carcinogenesis (Review)". International Journal of Oncology 41.6 (2012): 1919-1931.
Chicago
Kasprzak, A., Adamek, A."The insulin-like growth factor (IGF) signaling axis and hepatitis C virus-associated carcinogenesis (Review)". International Journal of Oncology 41, no. 6 (2012): 1919-1931. https://doi.org/10.3892/ijo.2012.1666
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