Oncogenic ras Provokes Premature Cell Senescence Associated with Accumulation of p53 and p16INK4a
TL;DR: It is shown that expression of oncogenic ras in primary human or rodent cells results in a permanent G1 arrest, and that the onset of cellular senescence does not simply reflect the accumulation of cell divisions, but can be prematurely activated in response to an onCogenic stimulus.
About: This article is published in Cell.The article was published on 1997-03-07 and is currently open access. It has received 4770 citations till now. The article focuses on the topics: Stress-induced premature senescence & Cell aging.
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TL;DR: This work has been supported by the Department of the Army and the National Institutes of Health, and the author acknowledges the support and encouragement of the National Cancer Institute.
28,811 citations
Cites background from "Oncogenic ras Provokes Premature Ce..."
...…been observed to be inducible in certain cultured cells sents the cell generations required to produce it, raising in response to high level expression of genes such as the generational limit of normal somatic cells as a barrier the activated ras oncogene (Serrano et al., 1997). to cancer....
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TL;DR: It is proposed that the metabolism of cancer cells, and indeed all proliferating cells, is adapted to facilitate the uptake and incorporation of nutrients into the biomass needed to produce a new cell.
Abstract: In contrast to normal differentiated cells, which rely primarily on mitochondrial oxidative phosphorylation to generate the energy needed for cellular processes, most cancer cells instead rely on aerobic glycolysis, a phenomenon termed “the Warburg effect.” Aerobic glycolysis is an inefficient way to generate adenosine 5′-triphosphate (ATP), however, and the advantage it confers to cancer cells has been unclear. Here we propose that the metabolism of cancer cells, and indeed all proliferating cells, is adapted to facilitate the uptake and incorporation of nutrients into the biomass (e.g., nucleotides, amino acids, and lipids) needed to produce a new cell. Supporting this idea are recent studies showing that (i) several signaling pathways implicated in cell proliferation also regulate metabolic pathways that incorporate nutrients into biomass; and that (ii) certain cancer-associated mutations enable cancer cells to acquire and metabolize nutrients in a manner conducive to proliferation rather than efficient ATP production. A better understanding of the mechanistic links between cellular metabolism and growth control may ultimately lead to better treatments for human cancer.
12,380 citations
TL;DR: Nine tentative hallmarks that represent common denominators of aging in different organisms are enumerated, with special emphasis on mammalian aging, to identify pharmaceutical targets to improve human health during aging, with minimal side effects.
9,980 citations
Cites background from "Oncogenic ras Provokes Premature Ce..."
...The number of mechanisms that implement senescence in response to this variety of oncogenic insults has also grown, but the originally reported p16/Rb and p19/p53 pathways remain, in general, the most important ones (Serrano et al., 1997)....
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...The number of mechanisms that implement senescence in response to this variety of oncogenic insults has also grown, but the originally reported p16INK4a/Rb and p19ARF/p53 pathways remain, in general, the most important ones (Serrano et al., 1997)....
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TL;DR: Evidence that the appropriate and inappropriate production of oxidants, together with the ability of organisms to respond to oxidative stress, is intricately connected to ageing and life span is reviewed.
Abstract: Living in an oxygenated environment has required the evolution of effective cellular strategies to detect and detoxify metabolites of molecular oxygen known as reactive oxygen species. Here we review evidence that the appropriate and inappropriate production of oxidants, together with the ability of organisms to respond to oxidative stress, is intricately connected to ageing and life span.
8,665 citations
TL;DR: This work challenges previous assumptions about how the G1/S transition of the mammalian cell cycle is governed, helps explain some enigmatic features of cell cycle control that also involve the functions of the retinoblastoma protein (Rb) and the INK4 proteins, and changes the thinking about how either p16 loss or overexpression of cyclin D-dependent kinases contribute to cancer.
Abstract: Mitogen-dependent progression through the first gap phase (G1) and initiation of DNA synthesis (S phase) during the mammalian cell division cycle are cooperatively regulated by several classes of cyclin-dependent kinases (CDKs) whose activities are in turn constrained by CDK inhibitors (CKIs). CKIs that govern these events have been assigned to one of two families based on their structures and CDK targets. The first class includes the INK4 proteins (inhibitors of CDK4), so named for their ability to specifically inhibit the catalytic subunits of CDK4 and CDK6. Four such proteins [p16 (Serrano et al. 1993), p15 (Hannon and Beach 1994), p18 (Guan et al. 1994; Hirai et al. 1995), and p19 (Chan et al. 1995; Hirai et al. 1995)] are composed of multiple ankyrin repeats and bind only to CDK4 and CDK6 but not to other CDKs or to D-type cyclins. The INK4 proteins can be contrasted with more broadly acting inhibitors of the Cip/Kip family whose actions affect the activities of cyclin D-, E-, and A-dependent kinases. The latter class includes p21 (Gu et al. 1993; Harper et al. 1993; El-Deiry et al. 1993; Xiong et al. 1993a; Dulic et al. 1994; Noda et al. 1994), p27 (Polyak et al. 1994a,b; Toyoshima and Hunter 1994), and p57 (Lee et al. 1995; Matsuoka et al. 1995), all of which contain characteristic motifs within their amino-terminal moieties that enable them to bind both to cyclin and CDK subunits (Chen et al. 1995, 1996; Nakanishi et al. 1995; Warbrick et al. 1995; Lin et al. 1996; Russo et al. 1996). Based largely on in vitro experiments and in vivo overexpression studies, CKIs of the Cip/Kip family were initially thought to interfere with the activities of cyclin D-, E-, and A-dependent kinases. More recent work has altered this view and revealed that although the Cip/Kip proteins are potent inhibitors of cyclin Eand A-dependent CDK2, they act as positive regulators of cyclin Ddependent kinases. This challenges previous assumptions about how the G1/S transition of the mammalian cell cycle is governed, helps explain some enigmatic features of cell cycle control that also involve the functions of the retinoblastoma protein (Rb) and the INK4 proteins, and changes our thinking about how either p16 loss or overexpression of cyclin D-dependent kinases contribute to cancer. Here we focus on the biochemical interactions that occur between CKIs and cyclin Dand E-dependent kinases in cultured mammalian cells, emphasizing the manner by which different positive and negative regulators of the cell division cycle cooperate to govern the G1-to-S transition. To gain a more comprehensive understanding of the biology of CDK inhibitors, readers are encouraged to refer to a rapidly emerging but already extensive literature (for review, see Elledge and Harper 1994; Sherr and Roberts 1995; Chellappan et al. 1998; Hengst and Reed 1998a; Kiyokawa and Koff 1998; Nakayama 1998; Ruas and Peters 1998).
6,076 citations
Cites background from "Oncogenic ras Provokes Premature Ce..."
...…accumulates progressively as cells age, possibly being induced by a senescence timer (Alcorta et al. 1996; Hara et al. 1996; Palmero et al. 1997; Serrano et al. 1997; Zindy et al. 1997a), whereas p18INK4c and p19INK4d are focally expressed during fetal development and may have roles in…...
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References
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TL;DR: A consideration of the cause of the eventual degeneration of these strains leads to the hypothesis that non-cumulative external factors are excluded and that the phenomenon is attributable to intrinsic factors which are expressed as senescence at the cellular level.
7,348 citations
"Oncogenic ras Provokes Premature Ce..." refers background in this paper
...…of H-rasV12-arrested cells described populations transduced with empty viral vector (Fig- above are remarkably similar to cells that have surure 2A). passed their proliferative capacity and become senes- The proliferative properties of such cell populations cent (Hayflick and Moorhead, 1961)....
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TL;DR: It is shown that several human cells express a beta-galactosidase, histochemically detectable at pH 6, upon senescence in culture, which provides in situ evidence that senescent cells may exist and accumulate with age in vivo.
Abstract: Normal somatic cells invariably enter a state of irreversibly arrested growth and altered function after a finite number of divisions. This process, termed replicative senescence, is thought to be a tumor-suppressive mechanism and an underlying cause of aging. There is ample evidence that escape from senescence, or immortality, is important for malignant transformation. By contrast, the role of replicative senescence in organismic aging is controversial. Studies on cells cultured from donors of different ages, genetic backgrounds, or species suggest that senescence occurs in vivo and that organismic lifespan and cell replicative lifespan are under common genetic control. However, senescent cells cannot be distinguished from quiescent or terminally differentiated cells in tissues. Thus, evidence that senescent cells exist and accumulate with age in vivo is lacking. We show that several human cells express a beta-galactosidase, histochemically detectable at pH 6, upon senescence in culture. This marker was expressed by senescent, but not presenescent, fibroblasts and keratinocytes but was absent from quiescent fibroblasts and terminally differentiated keratinocytes. It was also absent from immortal cells but was induced by genetic manipulations that reversed immortality. In skin samples from human donors of different age, there was an age-dependent increase in this marker in dermal fibroblasts and epidermal keratinocytes. This marker provides in situ evidence that senescent cells may exist and accumulate with age in vivo.
6,696 citations
"Oncogenic ras Provokes Premature Ce..." refers result in this paper
...…were similar between parental andof the IMR90 cells in control cultures were SA-b-gal E1A-expressing cells (data not shown), demonstratingpositive, a value consistent with that previously dethat overexpression of H-rasV12 is not necessarily detri-scribed for young IMR90 cells (Dimri et al., 1995)....
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TL;DR: The authors are grateful to the members of their laboratories for their contributions to the reviewed studies and to F. Giardiello and S. Hamilton for photographs of colorectal lesions.
4,959 citations
"Oncogenic ras Provokes Premature Ce..." refers background in this paper
...In colorectal cancer, mutationperiods of time. and/or amplification of K-ras typically precedes p53 mu-Under normal culture conditions, induction of senestation (reviewed by Kinzler and Vogelstein, 1996)....
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TL;DR: The main role of pRB is to act as a signal transducer connecting the cell cycle clock with the transcriptional machinery, allowing the clock to control the expression of banks of genes that mediate advance of the cell through a critical phase of its growth cycle.
4,904 citations
"Oncogenic ras Provokes Premature Ce..." refers background in this paper
...…mutations that constitutively activate Ras proteins tumor suppressor protein, Rb, allowing progression ofare frequent in human cancers (reviewed by Bos, 1988). the cell-cycle toward S phase (reviewed by Sherr andOncogenic ras efficiently transforms most immortal roRoberts, 1995; Weinberg, 1995)....
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TL;DR: Observations indicate that a normal p53 gene is dispensable for embryonic development, that its absence predisposes the animal to neoplastic disease, and that an oncogenic mutant form of p53 is not obligatory for the genesis of many types of tumours.
Abstract: Mutations in the p53 tumour-suppressor gene are the most frequently observed genetic lesions in human cancers. To investigate the role of the p53 gene in mammalian development and tumorigenesis, a null mutation was introduced into the gene by homologous recombination in murine embryonic stem cells. Mice homozygous for the null allele appear normal but are prone to the spontaneous development of a variety of neoplasms by 6 months of age. These observations indicate that a normal p53 gene is dispensable for embryonic development, that its absence predisposes the animal to neoplastic disease, and that an oncogenic mutant form of p53 is not obligatory for the genesis of many types of tumours.
4,710 citations
"Oncogenic ras Provokes Premature Ce..." refers background in this paper
...Micewith p53 gene deletionsCold Spring Harbor, New York 11724 develop normally but are highly prone to tumor development (Donehower et al., 1992; Jacks et al., 1994)....
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