Study on role of HDAC5 in P-gp expression in rats in high-altitude low oxygen environment and its effect on phenytoin sodium pharmacokinetics / 中国药理学通报

Aim To explore the important role of HDAC5 in P-gp expression in rats in high-altitude low oxygen environment and its effect on phenytoin sodium pharmacokinetics. Methods Wistar rats were transported to Batang, Yushu, Qinghai, at an altitude of 4010 m, with 6 rats in each group, divided into 1 d and 3 d groups. Different groups were given phenytoin, phenytoin combined with hypericin, and phenytoin combined with verapamil. Plasma and liver tissues were collected at different time after taking the drug in the plateau area. The concentration of phenytoin sodium in plasma was determined by UFLC-MS method. Changes in protein expression were detected by Western blot. Results The results of UFLC-MS showed that the AUC

The protective effect of catechin on acute high-altitude hypoxic injury / 中国药理学通报

Aim To study the protective effect of catechin on acute altitude injury in rats. Methods Rats were randomly divided into six groups: control group, altitude hypoxia model group, rhodiola capsule group, low -, middle-and high dose of catechin groups. After three days of preventive administration, animals were rushed to 4 010 m altitude. After five days of continuous administration, abdominal aortic blood of rats was collected for blood gas detection. Cardiac, brain and lung tissues were collected for HE staining to observe the pathological changes. MDA content, GSH content, NO content, SOD activity of myocardial, brain and lung tissues were detected, so were IL-6 and TNF-α content in serum. Results Compared with the control group, blood oxygen saturation of rats of altitud hypoxia model group was significantly reduced, while myocardial, brain and lung tissues were damaged to different degrees. MDA and NO content increased, while GSH content and SOD activity decreased. The serum inflammatory factors TNF-α and IL-6 levels were elevated significantly. After catechin treatment, blood oxygen saturation of hypoxia rats significantly increased (P < 0. 05). HE staining results showed that myocardial, brain and lung tissue injury was alleviated to some extent. MDA, NO, IL-6 and TNF-α content were down-regulated, while GSH content and SOD activity were up-regulated respectively. Conclusions Catechin can resist high altitude hypoxia and protect the main organs from hypoxia injury in rats acute exposed to altitude, which is related to alleviating oxidative stress and inflammation caused by acute hypoxia exposure.

Research progress of ferroptosis in hypoxia-associated brain injury / 生理学报

Cerebral hypoxia often brings irreversible damage to the central nervous system, which seriously endangers human health. It is of great significance to further explore the mechanism of hypoxia-associated brain injury. As a programmed cell death, ferroptosis mainly manifests as cell death caused by excessive accumulation of iron-dependent lipid peroxides. It is associated with abnormal glutathione metabolism, lipid peroxidation and iron metabolism, and is involved in the occurrence and development of various diseases. Studies have found that ferroptosis plays an important role in hypoxia-associated brain injury. This review summarizes the mechanism of ferroptosis, and describes its research progress in cerebral ischemia reperfusion injury, neonatal hypoxic-ischemic brain damage, obstructive sleep apnea-induced brain injury and high-altitude hypoxic brain injury.

Effect of tumor necrosis factor-α overexpress on the biological properties dental pulp stem cells in microoxidative stress / 解剖学报

Objective To investigate the effect of tumor necrosis factor-α(TNF-α) on biological properties of dental pulp stem cells (DPSCs) in low-oxidation stress. Methods The experimental groups were as follows: normox, normox control plasmid, normox-TNF-α, 3% O

Research progress on effects of high altitude hypoxia environment on antiepileptic drugs / 中国药理学通报

Hie high altitude hypoxic environment affects the pharmacokinetic process of rlnjgs by changing the body's gastrointestinal emptying rate, organ blood flow, drug plasma protein binding rate, dnjg metabolizing enzymes and transporter expression.Epilepsy is a brain disease that requires long-term medication.Most anti-epileptic drugs have a low therapeutic index and a narrow range of effective blood drug concentrations.'Ilierapeu- tic dnjg monitoring (TDM) is commonly used clinically to find the best individualized medication method for antiepileptic dnjgs.rI1iis article summarizes the commonly used anti-epileptic dnjgs and their treatment windows in clinical practice, and analyzes the influence of the pharmacokinetics of anti-epileptic dnjgs in the high altitude hypoxic environment, so as to provide reference for the clinical use of anti-epileptic drugs at high altitude.

Effects of altitude hypoxia on cerebral blood distribution of sodium valproate in mice / 中国药理学通报

Aim To investigate the effects of altitude hypoxia on serum sodium valproate eoncentration and eerebral blood distribution.Methods Male mice were divided into control group and plateau group.Each group was given sodium valproate orally and intrave¬nously, respectively.UFLC-MS/MS was used to deter¬mine the concentration of sodium valproate in plasma and brain, and Western blot was used to detect the ex¬pression of P-gp in BBB.Results Compared with the control group, the ratio of brain/blood drug concentra¬tion in plateau group was up-regulated by 44.0% , 57.9% , 176.8% and 184.5% at 10, 30, 60 and 120 min, respectively.The ratio of brain/blood drug con-centration increased by 33.9% , 50.6% and 125.6% at 60 min, 120 min and 240 min in plateau group, re¬spectively.Compared with the control group, the ex¬pression of P-gp protein in BBB of mice in altitude group was significantly down-regulated by 58.46% (P < 0.05 ).Conclusions Compared with the control group, the brain/blood drug concentration ratio of val¬proic acid increases in high altitude hypoxia environ¬ment.Meanwhile, it is found that P-gp expression lev-el decreased in the brain mierovessels of mice under high altitude hypoxia environment, and the cerebral and blood distribution of valproic acid in mic increases in high altitude hypoxia environment.

Animal models of acute plateau disease / 中国药理学通报

Acute plateau disease refers to a variety of physiological and pathological reactions produced by the body in a short period of time after rapidly advancing into the high-pressure and low-oxygen plateau area with an altitude above 2 500 meters, mainly including acute mountain sickness (AMS), high altitude pulmonary edema (HAPE) and high altitude cerebral edema (H A C E), which seriously affects the health of people in the acute plateau and even threats their lives. The establishment of an animal model of acute plateau disease with good reproducibility and a sound evaluation system are the basis of the research on acute plateau disease. Acute plateau disease is mainly caused by the low oxygen conditions on the plateau, so the animal model of acute plateau disease can be established in plateau environment simulation cabin or plateau field, simple breeding or animal treadmill assisted sports training. The indicators that indicate the success of the model establishment are commonly used blood gas, inflammation factors, organizational water content and pathological section. In this article, the animal models of acute plateau disease established in recent years are reviewed from the aspects of modeling environment, modeling methods and evaluation indicators.

The effect of acute hypobaric hypoxia on bile acid composition in the small intestine of rats / 药学学报

In order to clarify the influence of acute hypobaric hypoxia on the bile acids of the rat small intestine, we used ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) to identify bile acids in the contents of the small intestine from untreated and acute hypobaric hypoxia-treated rats. Thirty-nine bile acids were detected; PCA and OPLS-DA analysis revealed marked differences in the composition of bile acids between the untreated and the acute hypobaric hypoxia groups. Bile acids were screened with VIP > 1, |log2FC| ≥ 1, P < 0.05, and a total of 7 bile acids with significant differences in content between the two groups were obtained, including 5 conjugated bile acids, 2 unconjugated bile acids; in addition, the content of conjugated bile acids has risen in the treated group. This study demonstrated the influence of high-altitude hypoxic environment on bile acid composition and metabolism in rats. All the animal experiments in this study were approved by the 940th Hospital Ethics Committee (approval No: 2020KYLL012).

Initial implantation experience and short-term follow-up results of implanting leadless intracardiac transcatheter pacing system / 中华心血管病杂志

Objective: To explore the utility and safety of leadless intracardiac transcatheter pacing system. Methods: The study was a prospective observational study. Patients underwent Micra transcatheter pacing system in Beijing Anzhen hospital from December 2019 to January 2020 were enrolled. The baseline characteristics, platelet count, hemoglobin, anticoagulation and/or antiplatelet therapy, mean procedural time, average fluoroscopy time, number of deployment and electrical parameters (threshold, R-wave amplitude, impedance) were recorded. Ultrasonography of bilateral femoral and iliac veins was performed in all patients. Patients were followed including access site complication, adverse event and device evaluation at implant, hospital discharge, 1 and 3 months post-implant. R-wave≥5 mV, impedance between 400 and 1 500 Ω and threshold increase≤1.5 V than implant is considered a stable parameter. Femoral access site complications included hematoma, hemorrhage, pseudoaneurysm, and arteriovenous fistula. Adverse events included dislodgement, cardiac effusion/perforation and infection. Left ventricular end diastolic diameter and ejection fraction before and at 1 month after implant were reported. Results: Five patients were enrolled and pacemaker implantation was successful in all 5 patients. Patients were all males and the average age was (78.4±8.4) years. 2 patients received aspirin and clopidogrel therapy, 1 patient suffered from anemia and thrombocytopenia occurred in 1 patient. No stenosis, occlusion and vascular malformation of bilateral femoral and iliac veins was observed. The mean implant time was (39.6±1.7) minutes. The average fluoroscopy time was (9.2±1.3) minutes and the number of deployment was (1.40±0.55). Electrical parameters(threshold, R-Wave amplitude and impedance) were as follows: (0.40±0.10) V/0.24 ms, (10.80±3.72) mV and (822.00±162.23) Ω at implant; (0.45±0.07) V/0.24 ms, (13.04±2.41) mV, and (748.0±91.5) Ω at discharge, (0.40±0.06) V/0.24 ms, (14.26±4.11) mV, and (700.0±91.7) Ω at 1 month post-implant and (0.39±0.05) V/0.24 ms, 14.40±3.97 mV, and (682.0±96.0) Ω at 3 months post-implant, respectively. Threshold increase was ≤1.5 V compared to that during implantation, electrical parameters were acceptable and stable. There was no difference in LVEDD [(44.00±5.24) mm vs. (44.00±5.34) mm,P=1.000] and EF [(62.00±3.39)% vs. (62.20±3.56)%, P=0.861] before and 1 month post-implant. No incidence of access site complications, cardiac effusion/perforation, dislodgment or infections occurred during the 3 months. Conclusions: The leadless transcatheter pacemaker implantation performed in our study archived a high implant success rate and favorable safety profile as well as associated with low and stable pacing thresholds. The long-term safety and benefit of leadless pacemaker need to be evaluated in future clinical studies.

Preliminary application of three-dimensional printing in dental education / 中华口腔医学杂志

As one of the rapid prototyping technology, three-dimensional (3D) printing is booming since its birth. 3D printing has already been applied in biomedical engineering, medical mold processing and many healthcare fields, but its application in dental education is still in the exploratory stage. Nowadays, educators are seeking to integrate 3D printing and dental education. On the basis of the advantages of 3D printing, the quality of dental education will be further improved and students′ enthusiasm for learning will be stimulated. This article will focus on elaborating the recent advances of 3D printing in dental education and exploring its direction in the field of teaching.

Interaction of amoxicillin and nifedipine mediated by intestinal flora / 药学学报

In this study, the change of intestinal microflora in rat fecal samples after amoxicillin administration was observed. In vitro incubation experiments combined with LC-MS/MS assay were used to test the role of intestinal flora in the metabolism of nifedipine. The effect of changes of intestinal flora was determined after amoxicillin administration on the metabolism of nifedipine. We found that the number and types of intestinal flora decreased after taking amoxicillin. After incubation for 12 h, the results showed that the remaining amounts of nifedipine in the N1 group (nifedipine) and N2 group (amoxicillin + nifedipine) were 0.057 6 and 0.064 8 μmol·L-1, respectively, while the remaining amounts of nifedipine after 24 h of incubation were 0.039 6 and 0.050 4 μmol·L-1, respectively. These results show that the intestinal flora is involved in the metabolism of nifedipine. After administration of amoxicillin, the metabolism of nifedipine was slowed down, the AUC0-t was increased by 39.10%, tmax was advanced by 0.45 h, and the CL was reduced 34.71%. The data suggest that the combination may enhance the therapeutic effect of nifedipine. Therefore, drug-drug interactions mediated by gut microbiota cannot be ignored when combined with antibiotics and nifedipine, one of the important factors affecting drug efficacy.

Significance and prognosis evaluation of monitoring plasma B-type natriuretic peptide and cardiac troponin I in patients with sepsis / 中国综合临床

Objective To evaluate the significance and prognostic evaluation of plasma B-type natriuretic peptide(BNP)and troponin(cTnI)in patients with sepsis.Methods A retrospective analysis was performed on the clinical data of ninety cases of diagnosed septic patients in Beijing Jiangong Hospital from October 2015 to October 2016,the patients were divided into the survival group and the death group.According to the cardiac function,the patients were assigned into the normal heart function group and the heart failure group,and then the cardiac insufficiency patients were divided into the cardiac insufficiency-dead group and cardiac insufficiency-survival group,The plasma levels of BNP and cTnI in each group were detected,and the ROC curve was used to evaluate the influence of BNP,cTnI on patients' prognosis.Results According to cardiac function grouping,BNP and cTnI in the cardiac insufficiency group were significantly higher than those in the normal cardiac function group(BNP:6980(5600,9850)ng/L vs.2500(1250,5640)ng/L〕; cTnI: 0.82 (0.52,1.22)μg/L)vs.0.52(0.25,0.66)μg/L),the differences were statistically significant(P<0.05);BNP in the cardiac insufficiency-dead group(8540(5680,13500)ng/L)was significantly higher than that in the cardiac insufficiency-survival group(5200(3570,8080)ng/L),the difference was statistically significant (P<0.05); There was no significant difference in cTnI between the cardiac insufficiency-dead group and the cardiac insufficiency-survival group(P>0.05);According to the prognosis,BNP and cTnI in the cardiac insufficiency-dead group were all significantly higher than those in the cardiac insufficiency-survival group〔BNP:7760(4755,11820)ng/L vs.2058(1200,4711)ng/L; cTnI:〔0.75(0.58,1.46)μg/L〕 vs.0.33(0.22, 0.61)μg/L〕,the differences were statistically significant(P<0.05).Conclusion The increase of BNP and cTnI in plasma may indicate a worse prognosis for patients.The monitoring of BNP and cTnI in plasma is helpful for early detection of cardiac dysfunction in patients with sepsis.

Significance and prognosis evaluation of monitoring plasma B-type natriuretic peptide and cardiac troponin I in patients with sepsis / 中国综合临床

Objective To evaluate the significance and prognostic evaluation of plasma B-type natriuretic peptide(BNP)and troponin(cTnI)in patients with sepsis.Methods A retrospective analysis was performed on the clinical data of ninety cases of diagnosed septic patients in Beijing Jiangong Hospital from October 2015 to October 2016,the patients were divided into the survival group and the death group.According to the cardiac function,the patients were assigned into the normal heart function group and the heart failure group,and then the cardiac insufficiency patients were divided into the cardiac insufficiency-dead group and cardiac insufficiency-survival group,The plasma levels of BNP and cTnI in each group were detected,and the ROC curve was used to evaluate the influence of BNP,cTnI on patients' prognosis.Results According to cardiac function grouping,BNP and cTnI in the cardiac insufficiency group were significantly higher than those in the normal cardiac function group(BNP:6980(5600,9850)ng/L vs.2500(1250,5640)ng/L〕; cTnI: 0.82 (0.52,1.22)μg/L)vs.0.52(0.25,0.66)μg/L),the differences were statistically significant(P<0.05);BNP in the cardiac insufficiency-dead group(8540(5680,13500)ng/L)was significantly higher than that in the cardiac insufficiency-survival group(5200(3570,8080)ng/L),the difference was statistically significant (P<0.05); There was no significant difference in cTnI between the cardiac insufficiency-dead group and the cardiac insufficiency-survival group(P>0.05);According to the prognosis,BNP and cTnI in the cardiac insufficiency-dead group were all significantly higher than those in the cardiac insufficiency-survival group〔BNP:7760(4755,11820)ng/L vs.2058(1200,4711)ng/L; cTnI:〔0.75(0.58,1.46)μg/L〕 vs.0.33(0.22, 0.61)μg/L〕,the differences were statistically significant(P<0.05).Conclusion The increase of BNP and cTnI in plasma may indicate a worse prognosis for patients.The monitoring of BNP and cTnI in plasma is helpful for early detection of cardiac dysfunction in patients with sepsis.

Clinical observation of Capecitabine versus S-1 as maintenance therapy for advanced gastric cancer after the first-line inductive chemotherapy / 中国肿瘤临床

Objective:To evaluate the efficacy and adverse reaction caused by Capecitabine compared with S-1 as maintenance treat-ments for patients with advanced gastric cancer (AGC) after first-line induction chemotherapy. Methods:A total of 130 AGC patients who did not suffer disease progression after first-line chemotherapies, including XELOX (four to six cycles), SOX (four to six cycles), and mFOLFOX6 regimen (six to eight cycles), were randomized into three groups. The Capecitabine group (Cap) received maintenance che-motherapy with Capecitabine (1 000 mg/m2 twice daily for 14 days, 21 days/cycle), while the S-1 group (S1) received S-1 (40, 50, or 60 mg according to the body surface area and orally administered twice a day for 14 days, 21 days/cycle). The control group was consid-ered as the observation group. Patients with maintenance treatments received drugs until disease progression or observation of intol-erant toxicity. Results:A total of 44, 33, and 53 patients received XELOX, SOX, and mFOLFOX6 regimens, respectively. The overall DCR was 63.1%. Among the 82 patients, 35, 28, and 19 belonged to the Cap, S1, and observation groups, respectively. The comparison be-tween the efficacy of treatments in the Cap and S1 groups did not show statistically significant differences (P=0.678). The median time of progression was 8.5 months in the Cap group and 9.0 months in the S1 group (P>0.05). Both groups showed better responses than the observation group, which demonstrated a median progression of 6.0 months (P<0.001). The median overall survivals were 14.5, 15.0, and 14.0 months in the Cap, S-1, and observation groups, respectively (P=0.188). The most common adverse effects observed among the patients with maintenance treatments included myelo-suppression, gastrointestinal reaction, fatigue, hand-foot syndrome, and stomatitis. No death occurred in relation to the therapy. Conclusion:The effectiveness of Capecitabine and S-1 as maintenance chemotherapies in AGC patients after the first-line induction chemotherapy are similar, and both can prolong the time of disease pro-gression with low toxicity.

Changes of P-gp expression in rats' small intestine and effects on uptake of levofloxacin after acute exposure to hypoxia / 药学学报

The drug transporter play a key role in the absorption of drugs. Investigation of the changes of drug transporters in response to hypoxia will provide insight into the mechanism of drug absorption. In this study we investigated the mRNA and protein expression of the transporter P-gp after acute hypoxia, and evaluated the effects of P-gp changes on absorption of levofloxacin in the intestine. The relative expression of mRNA and protein were reduced by 50.80% and 71.30% (PP<0.05). These results suggest that hypoxia may decrease the expression of P-gp in the intestine to reduce the excretion of levofloxacin and increase the absorption.

Evaluation of the efficacy and safety of telbivudin in preventing mother-to-infant HBV transmission / 中国药学杂志

OBJECTIVE: To evaluate the efficacy and safety of telbivudine in preventing mother-to-infant HBV transmission in pregnant women who have positive HBsAg and HBeAg during the third trimester of pregnancy. METHODS: A total of 80 pregnant women, who had positive HBsAg and HBeAg with HBV DNA levels of ≥1 × 106 copies · mL-1 were divided into two groups: the treatment group and the control group. Each group comprised 40 cases. The subjects in the treatment group received telbivudine 600 mg once daily from the 28th weeks of pregnancy till delivery. The subjects in the control group did not receive telbivudine or other anti-virus drugs. The adverse reactions of the subjects in the treatment group were observed, and the serum HBV DNA levels in the two groups were measured at the 28th weeks of pregnancy, upon delivery and 6 months after delivery, respectively. The infants in the two groups received IM HBIG 200 IU immediately after birth and 1 month after birth. And both of the groups received IM hepatitis B vaccine 10 μg immediately after birth as well as 1 month and 6 months after birth. The serum HBsAg and HBV DNA levels in all infants were measured at birth, 6 months, and 12 months after birth, respectively. RESULTS: There was no significant difference in serum HBV DNA levels between the treatment group and the control group at the 28th weeks of pregnancy. The serum HBV DNA level immediately after delivery in the treatment group [(3.48±0.90) × 10 copies · mL-1] was significantly decreased compared with the control group [(6.96±0.94) × 10 copies · mL-1](P<0.05). There was no significant difference in HBV DNA levels between the treatment group and the control group 6 months after delivery. The rates of mother-to-infant HBV transmission in 12-month-old infants in the treatment group and the control group were 97.5% and 75%, respectively. The difference was statistically significant(P<0.05). No adverse reaction was found in the treatment group, and abnormal development was not found in the infants of the two groups. CONCLUSION: Telbivudine appears to be effective and safe in preventing HBV mother-to-infant transmission and has no influence on infant development.

Cis-CA1P inhibits tumor cell proliferation and prevents blood vessel formation / 中国应用生理学杂志

<p><b>OBJECTIVE</b>To investigate the effects of cis-combretastatin-A1 phosphate (cis-CA1P) on tumor cell proliferation, and its effects on the blood vessel formations.</p><p><b>METHODS</b>MTT and IC50 values were used to assess the inhibitory effects of cis-CA1P on tumor cell proliferation. Chicken embryo chorioallantoic membrane and thoracic aorta annulations isolated from rats were used to investigate the effects of cis-CAIP on the blood vessel formation.</p><p><b>RESULTS</b>Cis-CA1P concentration-dependently inhibited the proliferations of several cancer cell lines, including human gastric carcinoma cell line MGC-803, human leukemic monocyte lymphoma cell line U937, human melanoma cell line A375, human colon cancer cell line HCT116, human breast carcinoma cell line MDA-MB-231, and human leukemia cell line K562. Cis-CAIP significantly decreased the formation of blood vessels in chicken embryo chorioallantoic membrane and in thoracic aorta annulations.</p><p><b>CONCLUSION</b>Cis-CA1P inhibits cancer cell proliferation and prevents blood vessel formation.</p>

Characterization of the doxDA Operons of Acidithiobacillus ferrooxidans / 微生物学通报

Reverse transcriptase-PCR experiments suggest that the two clusters of genes potentially involved in the oxidation of reduced sulfur compounds are organized as operons in strain of the acidophilic, chemolithoautotrophic bacterium Acidithiobacillus ferrooxidans ATCC 23270, the two clusters of genes including such the ORF of putative sulfate-thiosulfate-molybdate binding proteins, the ORF of putative thiosulfate: quinone oxidoreductase and the ORF of the rhodanese-like protein (P21). Bioinformatic analyses have predicted the possible promoters sequences and the possible +1 start site of transcription for the doxDA operons.

Reverse effects of zoledronic acid on the malignant phenotype of Bel-7402 human hepatocancinoma cells / 中国基层医药

Objective To investigate the reverse effects of zoledronic acid on the malignant phenotype of Bel-7402 human hepatocarcinoma cells.Methods The AFP secretary amount of the cells was determind with RIA,and thespecfic activities of tyrosine-?-ketoglutarate transaminase(TAT),ornithine carbamyl transferase(OCT) and alkaline phospharase(ALP),?-glutamgl transpeptidase(?-GT) and aldolase(ALD) were assayed by enzymological methods.Results Treating with 0.05?g/ml zoledronic acid,the proliferation of the cells,the secretary amount of AFP,and the specific activities of ?-GT and ALD significantly decreased(P

Differential Analysis of Mutation of Fibroblast Cells Before and After Cadmium Treatment / 医学研究杂志

Objective Because in the environment there are many compounds to cause variation of cells, the study for high sensitivity’s method in which the variation of cells by environment can be tested is necessary. For example, the reports of detailed study for the application of cadmium on the human body cell’s lethal toxicity and the variation of cells are very few. This research is about a high sensitivity method of heavy metal cadmium’s variation active processed by cadmium in which the variation of cells can be tested by ultraviolet ray. Methods The study used cultured cells of human being and derivation. The assay of mutagenicity OuaR (Ouabain resistance) variation used picking law and Differential dot-blot of cancer gene K-ras variation the hybridization examination method. In order to test the induction’s frequency of cell variation, MTT (methyl thiazolyl tetrazoliun) and survival efficiency of formation were tested. The clarifing of mutagenicity mechanism used Western blot and the siRNA method to analysis the molecular of heat shock protein. Results Cadmium clarifiing mutagenicity variation detection had the same degree with the method of ultraviolet ray. The DNA was injury corresponding to the HSP27 protein cell’s change.The cell variation frequency also presented the high value. Conclusion Human fibroblasts in the role of the heavy metal cadmium showed that HSP27 protein expression in high-UVr-1 cells RSa has lowor-frequency variations than OuaR cells. K-ras dot blot method proved that RSa cells variation is higher than the cells UVr-1 mutation. In siHSP27 cells, we observed OuaR high variability of expression. Cadmium on DNA damage showns UVr-1 fibroblast cell is lower than RSa fibroblasts cell.