*Corresponding author:Maria Wolun Cholewa, Department of Cell Biology, Poznan University of Medical Sciences, Rokietnicka 5D, 60-806 Poznan, Poland
Received: April 23, 2018; Published: May 09,2018
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Results of recent studies showed that the insulin growth factor (IGF) pathway might be implicated in the development of epithelial ovarian cancer (EOC). Moreover, it was demonstrated that EOC cells with high microsatellite instability (MSI-H; non19/non19) accumulate mutations in the IGF-1 gene. The aim of our study was to analyses the (CA)n repeats polymorphism in the P1 promoter region of the IGF-1 gene in EOC and healthy volunteers.For identification of (CA)n repeats PCR and DNA sequencing were utilised. Serum blood concentrations of IGF-1, IGFBP-1, IGFBP-3 were determined with ELISA. IGF-1 expression was assessed by immunohistochemical analysis. According to the obtained results biological samples were classified as microsatellite instability-high (MSI-H), MSI low (MSI-L) and microsatellite stable (MSS).
The results of the study showed that the most frequent genotype in the control group was MSS and in the EOC group - MSI-H. The IGF-1 level was positively correlated with IGFBP-3 in the MSS and MSI-H genotypes, only. The number of IGF-1-immunopositive cells did not differ between histopathological tissue types. Taking into consideration the genetic instability, the number of IGF-1-immunopositive cells in control group was significantly higher in MSS than in MSI-L and MSI-H genotypes. Between MSI-L and MSI-H genotypes, there was no difference in the number of IGF-1-immunopositive cells. In cancer cells, the number of IGF-1-immunopositive cells did not differ significantly depending on the type of instability observed. Regarding the histopathological diagnosis, low, as well as high instability profiles, were characterized by significantly higher number of IGF-1-immunopositive cells in cancer group. No significant differences were found in MSS profile in the number of IGF-1-immunopositive cells between the control and cancer groups.Present study suggests that IGF-1 (CA)19 gene polymorphisms are associated with occurrence EOC in Caucasian females.
Keywords: CA (19)n P1IGF-I Repeats; IGF-1; IGFBP-1; IGFBP-3; Epithelial Invasive Ovarian Cancer
Abbreviation: EOC: Epithelial Invasive Ovarian Cancer; CA: Cytosine Adenosine; FIGO: International Federation of Gynecology and Obstetrics; ELISA: Enzyme-Linked Immunosorbent Assay; t-SNPs: Tag Single- Nucleotide Polymorphisms