Uv light and cisplatin induced dna damage response

Bcl-2 family proteins regulate DNA damage-induced apoptosis by regulating the release of mitochondrial cytochrome c in response to DNA damage. Cisplatin-induced DNA damage activates various signaling pathways to prevent or promote cell death.

Accumulation of Cisplatin Inside Cells Cisplatin and its analogues were initially thought to enter cells by passive diffusion because cisplatin uptake was linear, nonsaturable and could not be competed with platinum analogs [ 4 — 617 ].

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J Bacteriol— As a preliminary in vivo test, we generated a colon cancer cell line in which CSB expression was stably reduced and used this cell line in a tumour xenograft model.

Here we performed immunoprecipitation analysis to check for an interaction between Tim and Cry1 in the absence and presence of DNA damage at different times after damage. DNA damage and mutation are fundamentally different.

Chemotherapy induced DNA damage response

Here, we generated a robust circadian rhythm in mouse fibroblast cells and also in mouse liver to investigate the kinetics of the ATR-mediated checkpoint response by measuring p-Chk1 and p-p53 levels as a function of circadian time CT.

Translesion synthesis polymerases often have low fidelity high propensity to insert wrong bases on undamaged templates relative to regular polymerases.

This competes with the affinity towards the nitrogen atom in the DNA thus contributing towards resistance against the cytotoxic action of cisplatin [ 63 ]. Recent reports, however, suggest that MT-3 is overexpressed in hypoxic conditions, and the reaction between MT-3 and Pt II is kinetically preferred [ 81 ].

To confirm whether this response is indeed mediated by rhythmic clock activity, we measured the intensity of the phosphorylation at various time points. Adult tissues, including skin epidermis, gastrointestinal epithelium, and the hematopoietic system, have a high rate of cell turnover.

Journal of Nucleic Acids

Therefore, the induction of senescence and apoptosis is considered to be part of a strategy of protection against cancer. Substructurally, they were shown to be derived from the upper dermis and lower dermis.

Thus, induction of p53 by cisplatin resulted in the activation of these caspases contributing to nephrotoxicity [ ].

They further demonstrated that the activation by these pathways is specific to cisplatin and not to the cisplatin analogue oxaliplatin, thus highlighting the importance of the MMR system to specifically recognize cisplatin-DNA adducts [].

A critical enzyme in counteracting the toxicity of these species is superoxide dismutasewhich is present in both the mitochondria and cytoplasm of eukaryotic cells. The type of umuDC locus or mutagenesis phenotype a strain possessed was not correlated with its error-free response of survival after UV exposure, but similar diversity was apparent.

One detects the mismatch, and the other recruits an endonuclease that cleaves the newly synthesized DNA strand close to the region of damage.

Chemotherapy induced DNA damage response

In mouse liver, p-Chk1 and p-p53 were below the level of detection following a sub-lethal dose of cisplatin. Abstract Chemotherapeutics target rapidly dividing cancer cells by directly or indirectly inducing DNA damage.

Skin aging is defined as a continuous loss of certain characteristics present in juvenile skin, including decreased skin elasticity and pigmentation, and loss of ESCs [ 3 — 5 ]. Targeting the rapidly dividing cancer cells with genotoxic agents has demonstrated clinical utility and more recently, it has become apparent that the DDR impacts the response to these therapies both in terms of anti-cancer activity and toxicity to non-cancer cells.

Although p53 plays an important role in cisplatin-induced DNA damage response, pnegative cells also respond to cisplatin-induced DNA damage, suggesting alternate pathways of sensing cisplatin-induced DNA damage. Patients with PS also develop other systemic diseases such as atherosclerosis, osteoporosis, and diabetes mellitus at an early age [ 50 ].

Following DNA damage, cell cycle checkpoints are activated to delay cell-cycle progression to provide time for DNA repair or eliminate genetically unstable cells by inducing cell death. Adult ESCs residing within the niches remain there for self-renewal, whereas their progeny, committed to differentiation, leave the basal call layer and migrate towards the epidermal surface [ 13 ].

MT-3 isoform was initially thought to be unresponsive to the platinum drugs [ 81 ]. Cisplatin-induced genotoxic stress activates multiple signal transduction pathways, which can contribute to apoptosis or chemoresistance.

Finally, a connection between UVR and telomere attrition has recently been emphasized. Introduction Cisplatin was discovered fortuitously by Dr. The prokaryotic SOS system is regulated by two key proteins: Thus, DNA damage in frequently dividing cells, because it gives rise to mutations, is a prominent cause of cancer.

They are all initial responders to DNA damage and as far as we know the first kinases to initiate the DDR signaling cascade. These mechanisms do not require a template, since the types of damage they counteract can occur in only one of the four bases.

Global response to DNA damage[ edit ] Cells exposed to ionizing radiationultraviolet light or chemicals are prone to acquire multiple sites of bulky DNA lesions and double-strand breaks. Quantification of immunoblotting was performed using ImageQuant 5.

Introduction Skin serves as the major protective organ of the body. In short, the process involves specialized polymerases either bypassing or repairing lesions at locations of stalled DNA replication. UVR is known to be a mutagen; long-term overexposure to sunlight is associated with photoaging and formation of skin cancers [ 31 ].

In addition, clock proteins directly interact with and activate DNA damage checkpoint DDC factors for maintaining genomic integrity 8 Telomeres are nucleoprotein complexes that cap and save the ends of chromosomes from degradation and abnormal recombination. UV-Induced DNA Damage in Skin Cells Repetitive exposure to solar UVR is among the principal environmental factors that can hasten the aging process of the skin, accompanied by progressive impairment of epidermal stem cell function [ 30 ].

Many cell lines with acquired resistance to cisplatin often exhibit reduced drug accumulation.DNA damage response in cisplatin-induced AKI Cisplatin is one of the most effective chemotherapeutic drugs for the treatment of various types of malignant tumors, such as those of ovary, lung, head, bladder, and many others (Cepeda et al.,Siddik,Wang and Lippard, ).

In this study, we applied different dosages of UV light and Cisplatin, as DNA-damaging agents to SV40 T antigen immortalized MRC 5 Cells, to examine the various cell responses by assaying the relative concentration of key cell cycle regulatory proteins.

Functional relevance of the histone γH2Ax in the response to DNA damaging agents Ingrid DNA damage response (DDR).

DNA repair

Less clear is the functional role of γH2Ax during nucleotide excision repair (NER) and arrest of DNA replication following large adduct damage, such as UV light-induced photoproducts and DNA crosslinks where DSBs are.

The cell type-specific roles for TC-NER in determining the fate of UV-irradiated cells raised the question as to whether the response of tumour cells to UV light and cisplatin would more closely. UV light is both a mutagen and potent cytotoxic agent,which can trigger cell apoptosis by either accumulating DNA lesions or trigger CD95/Fas receptor and induce apoptosis directly (Rehemtulla et al., ).

Another well-characterized DNA damaging agent is cisplatin. Unlike UV light, It is usually introduced to the human body during chemotherapy. These observations demonstrate that a genus can possess a range of DNA damage response mechanisms, and suggest that DNA damage-induced mutation could be an important part of the evolution of the emerging pathogens A.

baumannii and A.

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Uv light and cisplatin induced dna damage response
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