Background: Cancer is a genetic disease and mainly arises due to a number of reasons include activation of onco-genes, malfunction of tumor suppressor genes or mutagenesis due to external factors. Methods: This article was written from the data collected from PubMed, Nature, Science Direct, Springer and Elsevi-er groups of journals. Results: Oncogenes are deregulated form of normal proto-oncogenes required for cell division, differentiation and regulation. The conversion of proto-oncogene to oncogene is caused due to translocation, rearrangement of chromo-somes or mutation in gene due to addition, deletion, duplication or viral infection. These oncogenes are targeted by drugs or RNAi system to prevent proliferation of cancerous cells. There have been developed different techniques of molecular biology used to diagnose and treat cancer, including retroviral therapy, silencing of oncogenes and muta-tions in tumor suppressor genes. Conclusion: Among all the techniques used, RNAi, zinc finger nucleases and CRISPR hold a brighter future towards creating a Cancer Free World.

Objective: Weightlessness simulation due to the simulated microgravity has been shown to considerably affect behavior of tumor cells. It is aim of this study to evaluate characteristics of human breast cancer cells in this scaffoldfree 3D culture model. Materials and Methods: In this experimental study, the cells were exposed to simulated microgravity in a randompositioning machine (RPM) for five days. Morphology was observed under phase-contrast and confocal microscopy. Cytofilament staining was performed and changes in expression level of cytofilament genes, proliferation/differentiation genes, oncogenes and tumor suppressor genes were detected by quantitative reverse transcription polymerase chain reaction (qRT-PCR), followed by western blot confirmation. Results: After five days, distinct spheroid formation was observed. Rearrangement of the cytoskeleton into spherical shape was visible. VIM gene expression was significantly up-regulated for adherent cells and spheroids (3. 3x and 3. 6x respectively, P<0. 05 each). RHOA also showed significant gene up-regulation for adherent cells and spheroids (3. 2x and 3. 9x respectively, P<0. 05 each). BRCA showed significant gene up-regulation in adherent cells and spheroids (2. 1x and 4. 1x respectively, P<0. 05 each). ERBB2 showed significant gene up-regulation (2. 4x, P<0. 05) in the spheroids, but not in the adherent cells. RAB27A showed no significant alteration in gene expression. MAPK) showed significant gene up-regulation in adherent cells and spheroids (3. 2x, 3. 0x, P<0. 05 each). VEGF gene expression was down-regulated under simulated microgravity, without significance. Alterations of gene expressions could be confirmed on protein level for vimentin and MAPK1. Protein production was not increased for BRCA1, human epidermal growth factor receptor 2 (HER2) and VEGF. Contradictory changes were determined for RHOA and its related protein. Conclusion: Microgravity provides an easy-to handle, scaffold-free 3D-culture model for human breast cancer cells. There were considerable changes in morphology, cytoskeleton shape and gene expressions. Identification of the underlying mechanisms could provide new therapeutic options.

Cancer is a genetic illness that develops for various reasons, including the activation of oncogenes, the failure of tumor suppressor genes, or mutagenesis induced by environmental stimuli. This article was produced using PubMed, Nature, Science Direct, Springer, and Elsevier data. Oncogenes are altered forms of normal proto-oncogenic genes that are important for cell proliferation, development, and regulation. The transformation of a gene to an oncogene is caused by chromosomal translocation or gene mutation due to addition, deletion, duplication, or viral infection. These oncogenes are targeted by medications or the RNAi system to limit malignant cell development. Various molecular biology methods for cancer detection and treatment have been developed, including targeting cancer stem cell pathways for cancer therapy, retroviral therapy, oncogene silencing, and alterations in tumor suppressor genes. Among all the techniques used, RNAi, zinc finger nucleases, and CRISPR have a greater chance of reaching a cancer-free planet.

Background: The herpes simplex virus (HSV) UL41 gene product, virion host shutoff (Vhs) protein, mediates the rapid degradation of both viral and cellular mRNA. This ability suggests that Vhs protein can be used as a suicide gene in cancer gene therapy applications. The recent reports have shown that the degradation of cellular mRNA during herpes simplex infection is selective. RNA containing AU-rich elements (ARE) in their 3’ untranslated ends are the targets for the Vhs protein. RNA that are not subject to Vhs proteindependent degradation are up-regulated during HSV infection. ARE are frequently found in mRNA that encode proto-oncogenes, nuclear transcription factors, and cytokines. In many human cancers, the AU-rich stretch of proto-oncogenes and regulatory genes has impaired. Methods: To investigate whether Vhs protein might be useful for inhibition of tumor cell proliferation, a eukaryotic expression vector containing Vhs protein gene was constructed. Cell degradation and RNA content of HeLa and MRC-5 tumor cells after transfection with the constructed vector were studied. Results: The results showed a strong inhibitory activity in proliferation of transfected tumor cells and a sharp decrease in their RNA content. Conclusion: These data suggest that Vhs protein can be considered as a candidate for suicide cancer gene therapy.

Objective: Pulegone (PGN) is a monoterpene ketone, whose metabolites exert several cytotoxic effects in various tissues. The present study was conducted in order to evaluate the (R)-(+) PGN-induced alterations in ovarian aromatization, proto-oncogenes and estrogen receptorα (ERa) and ERβ receptors expressions.Materials and Methods: In this experimental study, mature albino mice were divided into experimental (received 25 mg/kg, 50 mg/kg and 100 mg/kg PGN, orally for 35 days) and control (received 2% solution of Tween 80 as a PGN solvent, orally) groups. The mRNA levels of Era, Erb, p53, Bcl-2, and cytochrome p450 (Cyp19) as well as ovarian angiogenesis were analyzed through reverse transcription polymerase chain reaction and immunohistochemical techniques, respectively. Moreover, apoptosis of follicular cells, serum estrogen and progesterone levels and mRNA damage were investigated via using terminal transferase and biotin-16-dUTP staining, electrochemilunescence and fluorescent microscopy methods, respectively. Results: The PGN reduced Era, Erb and Cyp19 expression at 50 mg/kg and 100 mg/kg doses, while significantly elevating p53 and reducing Bcl-2 expression. Finally, PGN impaired ovarian angiogenesis, increased apoptosis, elevated follicular atresia and reduced serum levels of estrogen and progesterone.Conclusion: Chronic exposure to PGN (50 mg/kg and 100 mg/kg), severely affects ovarian aromatization, proto-oncogenes mRNA levels and expression of ERs.