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UbcH10 overexpression increases carcinogenesis and blocks ALLN susceptibility in colorectal cancer.

ABSTRACT: Cyclins are essential for cell proliferation, the cell cycle and tumorigenesis in all eukaryotes. UbcH10 regulates the degradation of cyclins in a ubiquitin-dependent manner. Here, we report that UbcH10 is likely involved in tumorigenesis. We found that cancer cells exposed to n-acetyl-leu-leu-norleucinal (ALLN) treatment and UbcH10 depletion exhibit a synergistic therapeutic effect. Abundant expression of UbcH10 drives resistance to ALLN-induced cell death, while cells deficient in UbcH10 were susceptible to ALLN-induced cell death. The depletion of UbcH10 hindered tumorigenesis both in vitro and in vivo, as assessed by colony formation, growth curve, soft agar and xenograft assays. These phenotypes were efficiently rescued through the introduction of recombinant UbcH10. In the UbcH10-deficient cells, alterations in the expression of cyclins led to cell cycle changes and subsequently decreases in tumorigenesis. The tumorigenesis of xenograft tumors from UbcH10-deficient cells treated with ALLN was decreased relative to wild-type cells treated with ALLN in nude mice. On the molecular level, we observed that UbcH10 deficiency enhances the activation of caspase 8 and caspase 3 but not caspase 9 to impair cell viability upon ALLN treatment. Collectively, our results suggest that, as an oncogene, UbcH10 is a potential drug target for the treatment of colorectal cancer.

SUBMITTER: Li SZ

PROVIDER: S-EPMC4223683 | biostudies-literature | 2014 Nov

REPOSITORIES: biostudies-literature

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UbcH10 overexpression increases carcinogenesis and blocks ALLN susceptibility in colorectal cancer.

Li Shang-Ze SZ Song Yang Y Zhang Hui-Hui HH Jin Bing-Xue BX Liu Yi Y Liu Wen-Bin WB Zhang Xiao-Dong XD Du Run-Lei RL

Scientific reports 20141107

Cyclins are essential for cell proliferation, the cell cycle and tumorigenesis in all eukaryotes. UbcH10 regulates the degradation of cyclins in a ubiquitin-dependent manner. Here, we report that UbcH10 is likely involved in tumorigenesis. We found that cancer cells exposed to n-acetyl-leu-leu-norleucinal (ALLN) treatment and UbcH10 depletion exhibit a synergistic therapeutic effect. Abundant expression of UbcH10 drives resistance to ALLN-induced cell death, while cells deficient in UbcH10 were ...[more]

PMID: 25376843

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Project description:Invasive growth of epithelial cancers is a complex multi-step process which involves dissolution of the basement membrane. Type IV collagen is a major component in most basement membranes. Type VII collagen is related to anchoring fibrils and is found primarily in the basement membrane zone of stratified epithelia. Immunohistochemical studies have previously reported changes in steady-state levels of different alpha(IV) chains in several epithelial cancer types. In the present study we aimed to quantitatively determine the mRNA levels of type IV collagen (alpha1/alpha 4/alpha 6) and type VII collagen (alpha1) during colorectal cancer carcinogenesis.Using quantitative RT-PCR, we have determined the mRNA levels for alpha1(IV), alpha 4(IV), alpha 6(IV), and alpha1(VII) in colorectal cancer tissue (n = 33), adenomas (n = 29) and in normal tissue from the same individuals. In addition, corresponding tissue was examined from healthy volunteers (n = 20). mRNA levels were normalized to beta-actin. Immunohistochemical analysis of the distributions of type IV and type VII collagens were performed on normal and affected tissues from colorectal cancer patients.The alpha1(IV) and alpha1(VII) mRNA levels were statistically significantly higher in colorectal cancer tissue (p < 0.001) as compared to corresponding tissue from healthy controls. This is an early event as tissue from adenomas also displayed a higher level. There were small changes in the levels of alpha 4(IV). The level of alpha 6(IV) was 5-fold lower in colorectal cancer tissue as compared to healthy individuals (p < 0.01). The localisation of type IV and type VII collagen was visualized by immunohistochemical staining.Our results suggest that the down-regulation of alpha 6(IV) mRNA coincides with the acquisition of invasive growth properties, whereas alpha1(IV) and alpha1(VII) mRNAs were up-regulated already in dysplastic tissue. There are no differences in collagen expression between tissues from healthy individuals and normal tissues from affected individuals.

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UbcH10 overexpression increases carcinogenesis and blocks ALLN susceptibility in colorectal cancer.

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UbcH10 overexpression increases carcinogenesis and blocks ALLN susceptibility in colorectal cancer.

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