| 词条 | P16 |
| 释义 |
| Symbol = P19Arf_N | Name = Cyclin-dependent kinase inhibitor 2a p19Arf N-terminus | image = PDB 1hn3 EBI.jpg | width = | caption = solution structure of the n-terminal 37 amino acids of the mouse arf tumor suppressor protein | Pfam = PF07392 | Pfam_clan = | InterPro = IPR010868 | SMART = | PROSITE = | MEROPS = | SCOP = 1hn3 | TCDB = | OPM family = | OPM protein = | CAZy = | CDD = }} p16 (also known as p16INK4a, cyclin-dependent kinase inhibitor 2A, multiple tumor suppressor 1 and as several other synonyms), is a tumor suppressor protein, that in humans is encoded by the CDKN2A gene.[1][2][3] p16 plays an important role in cell cycle regulation by decelerating the cell's progression from G1 phase to S phase, and therefore acts as a tumor suppressor that is implicated in the prevention of cancers, notably melanoma, oropharyngeal squamous cell carcinoma, cervical cancer, and esophageal cancer. p16 can be used as a biomarker to improve the histological diagnostic accuracy of CIN3. Expression of the CDKN2A gene is frequently changed in a wide variety of tumors. p16 was originally found in an “open reading frame of 148 amino acids encoding a protein with a molecular weight of 16 kDa that comprises four ankyrin repeats.”[4] The name of p16 is derived from its molecular weight, while the alternative name p16INK4a additionally refers to its role in inhibiting CDK4.[4] Nomenclaturep16 is also known as:
GeneIn humans, p16 is encoded by the CDKN2A gene, located on chromosome 9 (9p21.3). This gene generates several transcript variants that differ in their first exons. At least three alternatively spliced variants encoding distinct proteins have been reported, two of which encode structurally related isoforms known to function as inhibitors of CDK4. The remaining transcript includes an alternate exon 1 located 20 kb upstream of the remainder of the gene; this transcript contains an alternate open reading frame (ARF) that specifies a protein that is structurally unrelated to the products of the other variants.[5] The ARF product functions as a stabilizer of the tumor suppressor protein p53, as it can interact with and sequester MDM2, a protein responsible for the degradation of p53.[6][7] In spite of their structural and functional differences, the CDK inhibitor isoforms and the ARF product encoded by this gene, through the regulatory roles of CDK4 and p53 in cell cycle G1 progression, share a common functionality in controlling the G1 phase of the cell cycle. This gene is frequently mutated or deleted in a wide variety of tumors and is known to be an important tumor suppressor gene.[1] When organisms age, the expression of p16 increases to reduce the proliferation of stem cells.[8] This reduction in the division and production of stem cells protects against cancer while increasing the risks associated with cellular senescence. Functionp16 is an inhibitor of cyclin-dependent kinases (CDK). It slows down the cell cycle by prohibiting progression from G1 phase to S phase. Otherwise, CDK4/6 binds cyclin D and forms an active protein complex that phosphorylates retinoblastoma protein (pRB). Once phosphorylated, pRB dissociates from the transcription factor E2F1. This liberates E2F1 from its bound state in the cytoplasm and allows it to enter the nucleus. Once in the nucleus, E2F1 promotes the transcription of target genes that are essential for transition from G1 to S phase.[9][10] This pathway connects the processes of tumor oncogenesis and senescence, fixing them on opposite ends of a spectrum. On one end, the hypermethylation, mutation, or deletion of p16 leads to downregulation of the gene and can lead to cancer through the dysregulation of cell cycle progression. Conversely, activation of p16 through reactive oxygen species, DNA damage, or senescence leads to the buildup of p16 in tissues and is implicated in the aging of cells.[9] RegulationRegulation of p16 is complex and involves the interaction of several transcription factors, as well as several proteins involved in epigenetic modification through methylation and repression of the promoter region.[9] PRC1 and PRC2 are two protein complexes that modify the expression of p16 through the interaction of various transcription factors that execute methylation patterns that can repress transcription of p16. These pathways are activated in the cellular response to reduce senescence.[11][12] Clinical significanceRole in cancerMutations resulting in deletion or reduction of function of the CDKN2A gene are associated with increased risk of a wide range of cancers, and alterations of the gene are frequently seen in cancer cell lines.[13][14] Examples include: Pancreatic adenocarcinoma is often associated with mutations in the CDKN2A gene.[15][16][17]Carriers of germline mutations in CDKN2A have, besides their high risks of melanoma, also increased risks of pancreatic, lung, laryngeal and oropharyngeal cancers. Tobacco smoking increases the carriers’ susceptibility for such non-melanoma cancers.[18] Homozygous deletions of p16 are frequently found in esophageal cancer and gastric cancer cell lines.[19] Germline mutations in CDKN2A are associated with an increased susceptibility to develop skin cancer.[20] Hypermethylation of tumor suppressor genes has been implicated in various cancers. In 2013, a meta-analysis revealed an increased frequency of DNA methylation of the p16 gene in esophageal cancer. As the degree of tumor differentiation increased, so did the frequency of p16 DNA methylation. Tissue samples of primary oral squamous cell carcinoma (OSCC) often display hypermethylation in the promoter regions of p16. Cancer cells show a significant increase in the accumulation of methylation in CpG islands in the promoter region of p16. This epigenetic change leads to loss of the tumor suppressor gene function through two possible mechanisms: first, methylation can physically inhibit the transcription of the gene, and second, methylation can lead to the recruitment of transcription factors that repress transcription. Both mechanisms cause the same end result: downregulation of gene expression that leads to decreased levels of the p16 protein. It has been suggested that this process is responsible for the development of various forms of cancer serving as an alternative process to gene deletion or mutation.[21][22][23][24][25][26] p16 positivity has been shown to be favorably prognostic in oropharyngeal squamous cell carcinoma.[27] In a retrospective trial analysis of patients with Stage III and IV oropharyngeal cancer, HPV status was assessed and it was found that the 3-year rates of overall survival were 82.4% (95% CI, 77.2 to 87.6) in the HPV-positive subgroup and 57.1% (95% CI, 48.1 to 66.1) in the HPV-negative subgroup, and the 3-year rates of progression-free survival were 73.7% (95% CI, 67.7 to 79.8) and 43.4% (95% CI, 34.4 to 52.4), respectively. p16 status is so prognostic that the AJCC staging system has been revised to include p16 status in oropharyngeal squamous cell cancer group staging.[28] Clinical useBiomarker for cancer typesExpression of p16 is used as a prognostic biomarker for certain types of cancer. The reason for this is different types of cancer can have different effects on p16 expression: cancers that overexpress p16 are usually caused by the human papillomavirus (HPV), whereas cancers in which p16 is downregulated will usually have other causes. For patients with oropharyngeal squamous cell carcinoma, using immunohistochemistry to detect the presence of the p16 biomarker has been shown to be the strongest indicator of disease course. Presence of the biomarker is associated with a more favorable prognosis as measured by cancer-specific survival (CSS), recurrence-free survival (RFS), locoregional control (LRC), as well as other measurements. The appearance of hypermethylation of p16 is also being evaluated as a potential prognostic biomarker for prostate cancer.[29][30][31] p16 FISHp16 deletion detected by FISH in surface epithelial mesothelial proliferations is predictive of underlying invasive mesothelioma.[32] p16 immunochemistryAs consensus grows regarding the strength of p16 as a biomarker for detecting and determining prognoses of cancer, p16 immunohistochemistry is growing in importance.[9][29][33] gynecologic cancersp16 is a widely used immunohistochemical marker in gynecologic pathology. Strong and diffuse cytoplasmic and nuclear expression of p16 in squamous cell carcinomas (SCC) of the female genital tract is strongly associated with high-risk human papilloma virus (HPV) infection and neoplasms of cervical origin. The majority of SCCs of uterine cervix express p16. However, p16 can be expressed in other neoplasms and in several normal human tissues.[34] Urinary bladder SCCsMore than a third of urinary bladder SCCs express p16. SCCs of urinary bladder express p16 independent of gender. p16 immunohistochemical expression alone cannot be used to discriminate between SCCs arising from uterine cervix versus urinary bladder.[34] Role in senescenceConcentrations of p16INK4a increase dramatically as tissue ages. p16INK4a, along with senescence-associated beta-galactosidase, is regarded to be a biomarker of cellular senescence.[35] Therefore, p16INK4a could potentially be used as a blood test that measures how fast the body's tissues are aging at a molecular level.[36] Notably, a recent survey of cellular senescence induced by multiple treatments to several cell lines does not identify p16 as belonging to a "core signature" of senescence markers.[37] It has been used as a target to delay some aging changes in mice.[38] Role in neurogenesisp16INK4a has been shown to prevent the depletion during aging of neural stem and progenitor cells in one of the neurogenic niche of the adult brain, i.e, the subventricular zone, which generates throughout life new neurons migrating to the olfactory bulb [39]. Deletion of p16INK4a does not affect neurogenesis in the other adult neurogenic niche, the dentate gyrus of the hippocampus [40]. However, recently, it has been demonstrated that p16INK4a protects from depletion after a powerful proneurogenic stimulus - i.e., running - also stem and progenitor cells of the aged dentate gyrus [41]. In fact, after deletion of p16INK4a, stem cells of the dentate gyrus are greatly activated by running, while, in wild-type p16INK4a dentate gyrus stem cells are not affected by running.[41] Therefore, p16Ink4a plays a role in the maintenance of dentate gyrus stem cells after stimulus, by keeping a reserve of their self-renewal capacity during aging. Since the dentate gyrus plays a key role in spatial and contextual memory formation, p16INK4a is implicated in the maintenance of cognitive functions during aging. DiscoveryResearchers Manuel Serrano, Gregory J. Hannon and David Beach discovered p16 in 1993 and correctly characterized the protein as a cyclin-dependent kinase inhibitor. Since its discovery, p16 has become significant in the field of cancer research. The protein was suspected to be involved in carcinogenesis due to the observation that mutation or deletion in the gene was implicated in human cancer cell lines. The detection of p16 inactivation in familial melanoma supplied further evidence. p16 deletion, mutation, hypermethylation, or overexpression is now associated with various cancers. Whether mutations in p16 can be considered to be driver mutations requires further investigation.[13] Interactionsp16 has been shown to interact with: {{div col|colwidth=30em}}
See also
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1 : Tumor suppressor genes |
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