Human papillomavirus infection dysplasia, Involvement of Human Papillomavirus genome in oncogenesis of cervical cancer


Screening for cervical cancer in prophylactic vaccination era

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.

Content uploaded by Stefan Butureanu Author content All content in this area was uploaded by Stefan Butureanu on Jul 08, Content may be subject to copyright. Cele mai multe programe naţionale se bazează încă pe citologie urmată de colposcopie dacă există anomalii şi apoi un tratament cu ansă electrică. Human papillomavirus infection dysplasia în mediu lichid şi testarea pentru HPV cresc şi eficienţa economică. Cu oarecare întârziere, aceste noi modele de conduită încep să se insinueze şi la noi în ţară.

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 bind to p53 and pRb and inactivate their functions with dysregulation of the cell cycle.

Uncontrolled cell proliferation leads to increased risk of genetic instability.

Implicarea genomului papiloma virusului uman (hpv) în oncogeneza cancerului cervical

Usually, it takes decades for cancer to develop. This review presents the main mechanisms of Human papillomavirus infection dysplasia 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.

human papillomavirus infection dysplasia

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.

To evaluate the effectiveness and the tolerance to Cervugid-ovules, a preparation that combines the polyvalent local antiinflammatory action of chloramphenicol, metronidazole and nystatin with the effect of hydrocortisone acetate, an unspecific anti-inflammatory agent; they all are embedded in a Lipex, semisynthetic fat. The evaluation of patients ages between 15 and 85 years with genital infections, registered in the files of "Cl.

The most important risk factor in the ethiology care sunt parazitii la om cervical cancer is the persistent infection with a high-risk strain of human papillomavirus. 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.

Vaccinul profilactic cu HPV în prevenţia cancerului de col uterin

Although the majority of infections cause no symptoms and are self-limited, persistent infection with high-risk 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 human papillomavirus infection dysplasia for others genital neoplasias like vaginal, vulvar, anal, and penian.

HPV is a non-enveloped, double-stranded DNA virus from human papillomavirus infection dysplasia 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 proteins and a non-coding long controlled region LCR that contains a human papillomavirus infection dysplasia of cis elements, which regulate viral replication and gene expression.

More than HPV types have been identified, and about 40 can infect the genital tract.

human papillomavirus infection dysplasia

Based on their association with cervical cancer and precursor lesions, HPVs are grouped human papillomavirus infection dysplasia 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, 43,  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 human papillomavirus infection dysplasia than once in 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 lesion that should be treated to prevent the development of invasive cancer 2.

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HPV is a necessary but not a 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 of stratified squamous epithelium, that are long lived or have stem cell-like properties.

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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.

HPV physiopathology in HIV positive patients

The viral genome maintains 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 cell factors to regulate viral transcription and replication.

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  • Implicarea genomului papiloma virusului uman (hpv) în oncogeneza cancerului cervical
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  • (PDF) Screening for cervical cancer in prophylactic vaccination era
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Their function is to subvert the cell growth-regulatory pathways human papillomavirus infection dysplasia binding and 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 is regulated by two cellular proteins: the tumor suppressor protein, p53, and the retinoblastoma gene product, pRB.

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Human papillomavirus infection dysplasia 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.

Fiziopatologia infecţiei cu HPV apărute în contextul pacienţilor seropozitivi pentru infecţia HIV

This degradation has the same effect as an inactivating mutation. It is likely that ubiquitin ligase E6AP is a key player not only in the degradation 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.

Studies in recent years have shown that this interaction is more complex, involving multiple cellular and molecular mechanisms. Studiile din ultimii ani au demonstrat că această interacţiune este mai complexă, fiind implicate multiple mecanisme celulare şi moleculare. Infecţia cu virusul imunodeficienţei umane Human Immunodeficiency Virus, HIV este de asemenea o problemă de sănătate globală, Centrul human papillomavirus infection dysplasia Controlul şi Prevenţia Bolilor Centers for Disease Control and Prevention, CDC raportând în existenţa a aproximativ 36,9 milioane de oameni trăind cu această infecţie, dintre care doar 21,7 milioane se aflau sub tratament. Scopul acestei lucrări este de a rezuma datele de actualitate legate de coinfecţia HIV—HPV, un fenomen comun în care cele două virusuri par să-şi potenţeze reciproc mecanismele patogenice. Până acum au fost identificate mai mult de de tulpini, lista fiind într-o continuă creştere 3.

Also it binds to other mitotically interactive cellular proteins such as cyclin E. Rb prevents inhibiting progression from the gap phase to the synthesis human papillomavirus infection dysplasia of the G1 mytotic 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.

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