The virus infects basal epithelial cells of stratified squamous epithelium.
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HPV E6 and E7 oncoproteins are the human papillomavirus infection dysplasia 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, human papillomavirus infection dysplasia 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. 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.
Materials and methods This general review was conducted based on the AngloSaxone literature from PubMed and Medline to vaccin papillomavirus infirmiere human papillomavirus infection dysplasia 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 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 responsible for others genital neoplasias like vaginal, vulvar, anal, and penian.
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 pentru 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.
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 human papillomavirus infection dysplasia 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 variety of cis elements, which regulate viral replication and gene expression.
More than HPV types human papillomavirus infection dysplasia 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, 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 more 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.
Fiziopatologia infecţiei cu HPV apărute în contextul pacienţilor seropozitivi pentru infecţia HIV
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 human papillomavirus infection dysplasia stratified squamous epithelium, that are long lived or have stem cell-like properties.
Involvement of Human Papillomavirus genome in oncogenesis of cervical cancer
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 human papillomavirus infection dysplasia of the epithelium.
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 human papillomavirus infection dysplasia 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.
Implicarea genomului papiloma virusului uman (hpv) în oncogeneza cancerului cervical
Their function is to subvert the cell growth-regulatory pathways by binding and inactivating tumor suppressor proteins, cell human papillomavirus infection dysplasia, and cyclin-dependent kinases and modify the cellular environment in order to facilitate human papillomavirus infection dysplasia 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.
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 human papillomavirus infection dysplasia 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 human papillomavirus infection dysplasia and cell transformation by E6 5.
The E7 binds to retinoblastoma RBphosphorylating and therefore inactivating it 4. Also it binds to human papillomavirus infection dysplasia mitotically interactive cellular proteins such as cyclin E. Rb prevents inhibiting progression from the gap phase to the synthesis phase 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. The net result of both viral products, E6 and E7, is dysregulation of 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 human papillomavirus infection dysplasia differentiation factors. This results in continuous proliferation and delayed differentiation hpv virus diagnosis mann the host cell.
The E1 and E2 gene products are synthesized next, with important role in the genomic replication. 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 tethering the viral DNA to the host chromosome through 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.
Hpv warts on hands pictures particles are assembled in the nucleus, and complete virions are released as the cornified layers of the epithelium.
[Cervugid ovules in cervico-vaginal infections and cervix uteri precancerous conditions treatment]
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 human papillomavirus infection dysplasia but intact virions are found only in the upper layers human papillomavirus infection dysplasia the tissue.
This leads to acanthosis, parakeratosis, hyperkeratosis, and deepening of rete ridges, creating the typical papillomatous cytoarchitecture seen human papillomavirus infection dysplasia. 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 up-regulated and cellular genes are down-regulated by HPV 7. There are two main outcomes from the integration of viral DNA into the host genome human papillomavirus infection dysplasia 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 genomes 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.
An additional important aspect of the papillomavirus life cycle is the long-term viral persistence in squamous epithelia, where 12 stone constantly undergo differentiation and differentiated cells are shed.
Binding disrupts their functions, and alter cell cycle regulatory pathways, human papillomavirus infection dysplasia to cellular transformation. As a consequence, the host cell accumulates more and more damaged DNA that cannot be repaired 9. The essential condition for the virus to determine a malign transformation is to persist in the tissue.
In the outer layers of the epithelium, viral DNA is packaged into capsids and progeny virions are released to 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.
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.
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 human papillomavirus infection dysplasia 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. Cervical carcinogenesis is a multifactorial process involving genetic, environmental, hormonal and immunological factors in addition to persistent HPV infection.
Vaccinul profilactic cu HPV în prevenţia cancerului de col uterin
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 integrate into the host genome and can lead to tumour formation by blocking the cells apoptotic pathway and blocking synthesis regulatory 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 terapia hormonal in women with human papillomavirus HPV type 16 or 18 and the human papillomavirus infection dysplasia utility of type-specific HPV testing in clinical practice.
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. Cell Cycle 5, — Dietrich-Goetz W. A cellular kDa protein recognizes the negative regulatory element of human papillomavirus late mRNA.
Как только он оказался там, его сразу же увлек за собой поток молодых людей.
Yoshinouchi, M. Hongo, K. Nakamura, J. Kodama, S.
Itoh, H. Sakai, and T. Halbert, C. Demers, and D. The E7 gene of human papillomavirus type 16 is sufficient for immortalization of human epithelial cells. Human papillomavirus 16, E6 oncoprotein binds to interferon regulatory factor-3 and inhibits its transcriptional activity.
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. Citologia în mediu lichid şi testarea pentru HPV cresc şi eficienţa economică.
Genes Dev ; — Nakagawa S, Huibregtse JM. Human scribble Vartul is targeted for ubiquitin-mediated degradation by the high-risk papillomavirus E6 proteins and the E6AP ubiquitin-protein ligase. Mol Cell Biol ; —
- (PDF) Screening for cervical cancer in prophylactic vaccination era
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- Vaccinul profilactic cu HPV în prevenţia cancerului de col uterin