TAILIEUCHUNG - báo cáo khoa học: " Human papillomavirus-mediated carcinogenesis and HPV-associated oral and oropharyngeal squamous cell carcinoma. Part 1: Human papillomavirus-mediated carcinogenesis"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Human papillomavirus-mediated carcinogenesis and HPV-associated oral and oropharyngeal squamous cell carcinoma. Part 1: Human papillomavirus-mediated carcinogenesis | Feller et al. Head Face Medicine 2010 6 14 http content 6 1 14 HEAD FACE MEDICINE REVIEW Open Access Human papillomavirus-mediated carcinogenesis and HPV-associated oral and oropharyngeal squamous cell carcinoma. Part 1 Human papillomavirus-mediated carcinogenesis Liviu Feller Neil H Wood Razia AG Khammissa and Johan Lemmer Abstract High-risk human papillomavirus HPV E6 and E7 oncoproteins are essential factors for HPV-induced carcinogenesis and for the maintenance of the consequent neoplastic growth. Cellular transformation is achieved by complex interaction of these oncogenes with several cellular factors of cell cycle regulation including p53 Rb cyclin-CDK complexes p21 and p27. Both persistent infection with high-risk HPV genotypes and immune dysregulation are associated with increased risk of HPV-induced squamous cell carcinoma. Introduction Cancer is a disease primarily caused by cytogenetic changes that progress through a series of sequential somatic mutations in specific genes resulting in uncontrolled cellular proliferation 1 2 . It may be caused by exposure to any one or more of a variety of chemical or physical agents by random errors of genetic replication or by errors in DNA repair processes. Almost all cancers follow carcinogenic events in a single cell are monoclonal in origin and this characteristic distinguishes neoplasms from hyperplasias that have a polyclonal origin 1 . Mutations in genes controlling cell cycle progression gatekeeper genes and DNA repair pathways caretaker genes are the essential initiating events of cancer. Both oncogenes and tumour suppressor genes act as gatekeeper genes. After mutation certain genes may acquire new functions that lead to increased cell proliferation these genes are called oncogenes. Such a mutational event occurs characteristically in a single allele of the future oncogene and that allele then directly causes dys-regulation of molecular mechanisms that control cell cycle progression. .

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