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- Mumtaz, Melad, et al.
(author)
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Decreased expression of the chemokine CCL21 in human colorectal adenocarcinomas
- 2009
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In: Oncology Reports. - : Spandidos Publications. - 1021-335X .- 1791-2431. ; 21:1, s. 153-158
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Journal article (peer-reviewed)abstract
- Recent studies have revealed participation of chemokines in cancer by regulating leukocyte movement to modify local immunoresponse. The chemokine CCL21 has been identified to play a pivotal role in homing and localization of immune cells to lymphoid tissue and into organ of non-lymphoid origin. In the cancer biology CCL21 seems to have multifaceted roles. CCL21 attracts CCR7 bearing cells especially T and dendritic cells but also various cancer cells. Besides the antitumour role as leukocyte recruiting, CCL21 has been shown to facilitate dendritic cell functions and to exert an angiostatic effect. To gain insight into the possible influence of CCL21 oil colorectal cancer (CRC) we determined whether the CCL21 is altered in CRC tissue. Collectively, by using ELISA we noted a significant lower CCL21 level in cancer tissue compared with paired normal tissue. Patients with a tumour localized in the rectum revealed significantly lower level of CCL21 than patients with a tumour localized in the colon both compared with paired normal tissue. We used immunohistochemistry and found heterogeneous immunoreactivity predominantly within areas of stromal cells mainly in macrophages. We also used a TaqMan system to investigate two single-nucleotide polymorphisms rs 11574915 and rs 2812377 with Supposed effect on CRC. No significant difference was observed between CRC and control subjects regarding genotype and allelic distributions or associations to clinical characteristics or CCL21 tissue levels. Our study implied that lower level of CCL21 in CRC tissue supports the idea that cancer is related to immunodeficiency probably depending on regulatory factors produced by tumour cells and that the different levels of CCL21 in rectum and colon may reflect divergent mechanisms in colorectal carcinogenesis. Further studies are needed to clarify whether the CCL21 level has an impact on CRC progression and survival rate.
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| 4. |
- Wågsäter, Dick, et al.
(author)
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Resistin in Human Colorectal Cancer : Increased Expression Independently of Resistin Promoter -420C>G genotype.
- 2008
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In: Cancer Investigation. - : Taylor & Francis. - 0735-7907 .- 1532-4192. ; 26:10, s. 1008-1014
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Journal article (peer-reviewed)abstract
- A single nucleotide polymorphism (SNP) -420C> G of the resistin gene was screened in 248 colorectal cancer (CRC) patients and 256 controls. No significant difference in genotype distribution was found. However, we found an upregulation in 92% of the samples in the levels of resistin protein in cancer tissue (n = 83). Immunohistochemical analysis revealed heterogenous staining of resistin predominantly in the cancer tissue. Further, resistin induced secretion of MMP-2 and MMP-9 from monocytes. The results of this study suggest that resistin may play a partial role in CRC but that the -420C> G resistin polymorphism is not a potential genetic susceptibility factor.
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