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The virus infects basal epithelial cells of stratified squamous epithelium. HPV E6 and E7 oncoproteins are the critical molecules in the process of malignant tumour formation. Interacting with various cellular proteins, E6 and E7 influence fundamental cellular functions like cell cycle regulation, telomere maintenance, susceptibility to apoptosis, intercellular adhesion and regulation of immune responses. High-risk E6 and E7 hpv cancer pathogenesis to p53 and pRb and hpv cancer pathogenesis their functions with dysregulation of the cell cycle.
Uncontrolled cell proliferation leads to increased risk of genetic instability.
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Usually, it takes decades for cancer to develop. This review presents the main mechanisms of HPV genome in the carcinogenesis of the uterine cervix. Virusul infectează epiteliile bazale, celule de epiteliu scuamos stratificat. Proteinele celulare E6 și E7 influențează fundamental funcțiile celulare, cum ar fi reglarea ciclului celular, întreținerea telomerilor, susceptibilitatea la apoptoză, adeziunea intercelulară și reglarea răspunsurilor imune.
E6 și E7 cu grad ridicat de risc se leagă la p53 și PRB și inactivează funcțiile lor cu dereglarea ciclului celular.
Proliferarea necontrolată a celulelor conduce la un risc crescut de instabilitate genetică. De obicei, este nevoie de zeci de ani pentru a dezvolta un cancer. Acest review prezintă principalele mecanisme ale genomului HPV în carcinogeneza colului uterin.
The most important risk factor in the ethiology of cervical cancer is the persistent infection with a high-risk strain of human papillomavirus.
A very large percentage of the population is infected with HPV. So far, there are about known types of human papilloma viruses but with a better study are about 80, and of these only 10 to 15 are involved in the cancer pathology of cervix. In the skin infections hpv cancer pathogenesis caused by HPV human papilloma virus we find: warts, plantar warts, flat warts, ano-genital warts condiloma acuminatepapillomas and other lesions. Acesta este unul dintre cele mai comune virusuri transmise pe cale sexual?. Un foarte mare procent din popula?
Materials and methods This general review was conducted based on the AngloSaxone literature from PubMed and Medline to identify the role of HPV genome in the development of cervical cancer. Discussions Genital human papillomavirus HPV is the most common sexually transmitted infection.
Although the majority of infections cause no symptoms and are self-limited, persistent infection with hpv cancer pathogenesis types of HPV is the most important risk factor for cervical cancer precursors and invasive cervical cancer. The presence of HPV in They are also responsible for others genital neoplasias like vaginal, vulvar, anal, and penian. HPV is a non-enveloped, double-stranded DNA virus from the family of Papillomaviridae, with an 8 kb circular genome composed of six early ORFs open reading frames with role in viral transcription and replication E1, E2, E4, E5, E6, E7two late ORFs L1,2-capsid hpv cancer pathogenesis and a non-coding long controlled region LCR that contains a variety of cis elements, which regulate viral replication and gene expression.
Rolul virusului papiloma uman în etiologia patologiei oncologice a colului uterin
More than HPV types have been identified, and about 40 can infect the genital tract. Based on their association with cervical cancer and precursor lesions, HPVs are grouped to high-risk 16, 18, 31, 33, 34, 35, 39, 45, 51, 52, 56, 58, 59, 66, 68, 73, 82 and low-risk HPV types 6, 11, 42, hpv cancer pathogenesis, 44, 54, 61, 70, 72, Natural history Most genital HPV infections are benign, subclinical, and self-limited, and a high proportion of infections associated with low-grade cervical dysplasias also regress spontaneously 1.
By contrast, persistent cervical infection infection detected more than once hpv cancer pathogenesis an interval of 6 months or longer with an oncogenic HPV type, especially HPV 16 and HPV 18, is the most important risk factor for progression to high-grade dysplasia, a precancerous hpv cancer pathogenesis that should be treated to prevent the development of invasive cancer 2.
Practic, prezența tipurilor HPV oncogene a fost demonstrată în aproape toate cazurile de cancer cervical. Pentru HPV68 există mai puține dovezi, motiv pentru care a fost considerat carcinogen 2A probabil carcinogen. Cercetătorii au constatat de asemenea că adăugarea la grupul celor 13 tipuri HPV cu risc crescut carcinogene 1 și 2A a celor 7 tipuri HPV posibil carcinogene a crescut cu 2. Din acest motiv, s-ar impune o nouă clasificare a tipurilor HPV carcinogene. Cu toate acestea, având în vedere faptul că sunt foarte rar implicate în cancerele cervicale nu este necesar ca genotipurile HPV din categoria 2B să fie incluse în hpv cancer pathogenesis de screening sau vaccinuri2;3.
HPV is a necessary but not hpv cancer pathogenesis sufficient condition for the development of cervical cancer. Cofactors associated with cervical cancer include: cigarette smoking, increased parity, increased age, other sexually transmitted infections, immune suppression, long-term oral contraceptive use, and other host factors.
Figure 1. Schematic representation of the HPV double-stranded circular DNA genome Journal of Virology Nov HPV integration into the host genome and Papillomavirus life cycle To establish infection, the virus must infect basal epithelial cells hpv cancer pathogenesis stratified squamous epithelium, that are long lived or have stem cell-like properties.
Microtrauma of the suprabasal epidermal cells enables the virus to infect the cell within the basal layer. Once inside the host cell, HPV DNA replicates as the basal cells differentiate and progress to the surface of the epithelium. The viral genome hpv cancer pathogenesis itself as an episome in basal cells, where the viral genes are poorly expressed. In the differentiated keratinocytes of the suprabasal layers of the epithelium, the virus switches to a rolling-circle mode of DNA replication, amplifies its DNA to high copy number, synthesizes capsid proteins, and causes viral assembly to occur 3.
HPV needs host hpv cancer pathogenesis factors to regulate viral transcription and replication. Their function is to subvert the cell growth-regulatory pathways by binding hpv cancer pathogenesis inactivating tumor suppressor proteins, cell cyclins, and cyclin-dependent kinases and modify the cellular environment in order to facilitate viral replication in a cell that is terminally differentiated and has exited the cell cycle 4.
Cell growth hpv cancer pathogenesis regulated by two cellular proteins: the tumor suppressor protein, p53, and the retinoblastoma gene product, pRB. Unlike in many other cancers, the p53 in cervical cancer is usually wild type and is not mutated.
E6 binds to p53 via a cellular ubiquitin ligase named E6AP, so that it becomes ubiquitinated, leading to degradation and down-regulation of pathways involved in cycle arrest and apoptosis. This degradation has the same effect as an inactivating mutation.
Virusul HPV, asimptomatic
It is likely that ubiquitin ligase E6AP is a key player not only in the hpv cancer pathogenesis of p53 but also in the activation of telomerase and cell transformation by E6 5. The E7 binds to retinoblastoma RBphosphorylating and therefore inactivating it 4.
Also it binds to other mitotically interactive hpv cancer pathogenesis proteins such as cyclin E. Rb prevents inhibiting progression from the gap phase to the synthesis phase of the G1 hpv cancer pathogenesis cycle. When E7 binds to and degrades Rb protein, it is no longer functional and cell proliferation is left unchecked. The outcome is stimulation of cellular DNA synthesis and cell proliferation. The net result of both viral products, E6 and E7, is dysregulation hpv cancer pathogenesis the cell cycle, allowing cells with genomic defects to enter the S-phase DNA replication phase.
These oncoproteins have also been shown to promote chromosomal instability as well as to induce cell growth and immortalize cells. Next, the E5 gene product induces an increase in mitogen-activated protein kinase activity, thereby enhancing cellular responses to growth and differentiation factors.
This results in continuous proliferation and delayed differentiation of the host cell. The E1 and E2 gene products are synthesized next, with important role in the genomic replication.
Virusul HPV, asimptomatic - Revista Galenus
Through its interaction with E2, E1 is recruited to the replication origin oriwhich is essential for the initiation of viral DNA replication. E2 also contributes to the segregation of viral DNA in the cell division process by hpv cancer pathogenesis the viral DNA hpv cancer pathogenesis the host chromosome hpv cancer pathogenesis interaction with Brd4.
Segregation of the viral genome is essential to maintain the HPV infection in the basal cells, in which the copy number of the viral genome is very low. Then, a putative late promoter activates the capsid genes, L1 and L2 6. Viral particles are assembled in the nucleus, and complete virions are released as the cornified layers of the epithelium. The E4 viral protein may contribute directly to virus egress in the upper epithelial layer by disturbing keratin integrity. In the replication process, viral DNA becomes established throughout the entire thickness of the epithelium but intact virions are found only in the upper layers of the tissue.
This leads to acanthosis, parakeratosis, hyperkeratosis, and deepening of rete ridges, creating the typical papillomatous cytoarchitecture seen histologically. Oncogenesis of HPV Infection with high-risk HPV types interferes with the function of cell proteins and also with the expression of cellular gene products. Microarray analysis of cells infected with HPV has shown that cellular genes are hpv cancer pathogenesis and cellular genes are down-regulated by HPV 7.
There are two main outcomes from the integration of viral DNA into the host genome that can eventually lead to tumour formation: blocking the cells apoptotic pathway and blocking synthesis regulatory proteins, leading to uncontrolled mitosis. High risk HPVs have some specific strategies that contribute to their oncogenic potential. First, HPVs encode functions that make possible the replication in infected differentiated keratinocytes. Production of viral hpv cancer pathogenesis is critically dependent on the host cellular DNA synthesis machinery.
HPVs are replicated in differentiated squamous epithelial cells that are growth arrested and thus incompetent to support genome synthesis.
Human papillomavirus 52 positive squamous cell carcinoma of the conjunctiva
An additional important aspect of the papillomavirus life cycle is the long-term viral persistence in squamous epithelia, where cells constantly undergo differentiation and differentiated cells are shed. Binding disrupts their functions, and alter cell cycle regulatory pathways, leading to cellular transformation.
Department of Ophthalmology, Grigore T. E-mail: moc.
As a consequence, the host cell accumulates more and more damaged Hpv cancer pathogenesis that cannot be repaired 9. The essential condition for the virus to determine a malign transformation is to persist in the hpv cancer pathogenesis. Multiple intraductal papillomas treatment the outer layers of the epithelium, viral DNA is packaged into capsids and progeny virions are released hpv cancer pathogenesis re-initiate infection.
Because the highly immunogenic virions are synthesized at the upper layers of stratified squamous epithelia they undergo only relatively limited surveillance by cells of the immune system. These oncoproteins have also been shown to promote chromosomal instability as well as to induce cell growth and immortalize keratinocytes. E6-induced degradation of these proteins potentially causes loss of cell-cell contacts mediated by tight junctions and thus contributes to the loss of cell polarity seen in HPV-associated cervical cancers In addition to the effects of activated oncogenes and chromosome instability, potential mechanisms contributing to transformation include methylation of viral and cellular DNA, telomerase activation, and hormonal and immunogenetic factors.
Progression to cancer generally takes place over a period of 10 to 20 years. Figure 2.
Implicarea genomului papiloma virusului uman (hpv) în oncogeneza cancerului cervical
Cervical carcinogenesis is a multifactorial process involving genetic, environmental, hormonal and immunological factors in addition to persistent HPV infection. Three steps are necessary for development of cervical cancer: infection with a kigh-risk HPV type, progression to a premalignant lesion and invasion. High-risk HPV-DNA hpv hpv cancer pathogenesis pathogenesis into the host genome and can lead to tumour formation by blocking the cells apoptotic pathway and blocking synthesis hpv cancer pathogenesis proteins leading to uncontrolled mitosis.
Progression to cancer takes place over a very long period of time decadesso the most important way to prevent its development is an efficient screening program of all women regular Pap smears and gynecologic visits. Baseman, J. The epidemiology of human papillomavirus infections. Khan, M. The elevated year risk of cervical precancer and cancer in women with human papillomavirus HPV type 16 or 18 and the possible utility of type-specific HPV testing in clinical practice. Cancer Inst.
Flores, E. Allen-Hoffman, D. Lee, C. Sattler, and P. Establishment of the human papillomavirus type 16 HPV life cycle in an immortalized human foreskin keratinocyte cell line. Virology Syrjänen, S. New concepts on the role of human papillomavirus in cell cycle regulation. Thomas, M. Pim, and L. The role of the E6-p53 interaction in the molecular pathogenesis of HPV. Oncogene McBride A. Partitioning viral genomes in mitosis: same idea, different targets.