cancer cell-stromal cell interaction plays a crucial role in the growth and invasion of tumor cells of various organs. it has been recently suggested that adipocytes and preadipocytes, two specific types of stromal cells, affect the biological behavior of variety of breast cancer cell lines. in spite of few investigations, there is a controversy in the literatures about the effects of adipocyte...

Background: Usually, chemoradiotherapy can be used for the treatment of locally advanced colorectal cancer (CRC) before surgery. On the other hand, some studies have shown that fractional radiation of tumor cells leads to chemoresistance. The aim of this study was to evaluate the chemoresistance of radioresistant sub-line (RR sub-line).Methods: This study was done in Hamadan University of...

background: hyperglycemia is one of the important featurs of diabetes. in cell culture studies different methods are used to mimic the hyperglycemia condition. in this study we investigate response of human liver cancer cell line (hepg2) to high insulin, high glucose, and high insulin/ high glucose medium exposure. methods: hepg2 cells were settled in dmem+0.1% fbs or dmem free-serum medium wit...

objective: in an attempt to develop safer and more effective gene therapy approaches as a realistic treatment for various forms of cancer, researchers are increasingly using tumor-specific promoters (tsp) to drive the expression of the gene of interest and eradicate cancer cells. in this study, for the first time we introduce the oct-4 promoter as a cancer-specific promoter with a high efficacy...

transforming growth factor betas are multifunctional polypeptides in the cytokine superfamily. they have a growth inhibitory role on hemopoietic progenitor cells in semisolid colony assay as well as in long-term bone-marrow culture. tgf - β2 represses stromal cells, stem cell factor gene transcription, and decreases the stability of c-kit transcripts in hemopoietic cells. tgf-β also modulates g...

infectious bursal disease (ibd) is an economically important viral disease of chickens with worldwide distribution which suppresses the immune system of young chickens. vp2 is the major host-protective protein of infectious bursal disease virus (ibdv). the encoding region of vp2 protein was pcr amplified from a plasmid containing a cdna fragment of large genomic segment of ibdv, strain d78. thi...

background: the organochlorine ddt has estrogenic activity but the mechanism underlying the estrogenic activity of this pesticide remains unclear. in the present investigation here, we studied the transcriptional effects of a synthetic organochlorine pesticide o,p’-ddt [1.1.1.-trichloro-2-(o-chlorophenyl)-2-p-chloriphenyl ethane] and its metabolite p,p'-dde (2-2-bis(4/chlorophenyl)-1-1-dic...

abstract ethanol has a vast consumption around the world. many researches confirmed some adverse effect of this component on human health. in addition, recent studies showed significant alteration in both cellular population, and protein profile of human foreskin fibroblast cell line (hfff2) in the specific dosage of ethanol. here, the role and interaction of some proteins (characterized by sig...

background: chronic myeloid leukemia is a common cancer in human and chemical therapy is a routine method for treatment that has some side effects. so the goal of this study was the use of natural compound such as cell wall obtained from saccharomyces cerevisiae ( s. cerevisiae ) and saccharomyces boulardi ( s. boulardi ) and iron nanoparticles on the growth inhibition of k562 cell line. method...