Adult ; Burns ; etiology ; Humans ; Male ; Occupational Exposure ; Phosphorus ; adverse effects ; Young Adult

MicroRNAs (miRNAs or miRs) are a class of small non-protein-coding RNAs, approximately 18 to 25 nt long. MicroRNAs can act as endogenous RNA interference. MicroRNAs can posttranscriptionally regulate the expression of hundreds of their target genes, controlling a wide range of biological functions such as cellular proliferation, differentiation, and apoptosis. MicroRNAs can posttranscdptionally regulate the expression of genes by hybridizing to complementary sequences in 3' UTR (3' untranslated region) of target messenger RNA (mRNA), repressing the translation of mRNA or increasing the instability of mRNA. A number of miRNAs are mapped to cancer-associated fragile regions (FRAs) as well as in minimal regions of loss of heterozygosity, minimal regions of amplification, or common breakpoint regions in the genome, suggesting that miRNAs might be involved in tumorigenesis. Many miRNAs are up or down-regulated in cancers as potential oncogene or tumor suppressors. It has been considered that the mutation of a series of oncogene or anti-oncogene gradually causes tumorigenesis. The conventional points of view were changed with the finding of non-protein-coding RNAs. MiRNA as members of non-protein-coding RNAs may play an important role in regulating tumor formation. Recent studies have in-vestigated the relationship of miRNAs with neoplasia, development, treatment and prognosis. Lung cancer is the leading cause of cancer-related deaths all over the world. Its etiology is primarily genetic and epigenetic damage caused by tobacco smoke. Systematic analysis of RNA and protein expression levels of thousands of genes has also contributed to defining the molecular net work of lung carcinogenesis. MiRNAs are closely related to lung cancer and play an important part in the diagnosis, therapy, surveillance and prognosis of lung cancer. We reviewed some miRNAs closely associated with lung cancer such as miRNA-126, miRNA-221, miRNA-222, has-mir-221, a polycistronic microRNA cluster miR-17-92, miRNA-128b, has-mir-137, has-mir-182, has-mir-372 and miRNA let-7. We summarized the roles of miRNAs in the genetic susceptibility, invasion or metastasis, diagnosis, therapy and prognosis of lung cancer.

Objective:To prepare N-trimethyl chitosan (TMC)-coated sparfloxacin (SL) nanoliposomes in situ gels(ISG)and in-vestigate the drug release in vitro.Methods:SL liposomes were prepared by a pH gradient method , and then homogenized to nanolipo-somes by high pressure .TMC was used as the coating material to prepare TMC-coated SL nanoliposomes .Poloxamer 407 was used as the gel base, and the optimal amount was selected according to the gelation temperature .TMC-coated SL nanoliposomes ISG was pre-pared using a cold method , and the morphology , size, zeta potential and entrapment efficiency of TMC-coated SL nanoliposomes were studied.A membraneless model was used to study the drug release in vitro, and the result was compared with that of TMC-coated SL nanoliposomes.Results:The optimal amount of poloxamer 407 in the formula was 25%, and the gelation temperature was 23.6℃in the artificial tears and 33 .5℃in the diluted artificial tears .The morphology of TMC-coated SL nanaoliposomes in the ISG was spherical with the mean diameter of (96.8 ±1.5) nm, zeta potential of (46.2 ±1.4) mV and entrapment efficiency of (76.6 ±2.4) %, and the indices had no significant difference when compared with those of TMC-coated SL nanoliposomes .Both the drug release in vitro and gel dissolution profile of TMC-coated SL nanoliposomes ISG exhibited the characteristics of zero-order kinetics, and compared with that of TMC-coated SL nanoliposomes , the sustained release property of the ISG was more significant .Conclusion:TMC-coated SL nanoli-posomes ISG has promising gelation temperature and notable sustained release property .

Objective:To study the in vitro corneal permeation and antibacterial activity of N-trimethyl chitosan(TMC)-coated sparfloxacin lactate(SL)nanoliposomes. Methods:Franz diffusion cells were used with rabbit cornea as the barrier to study the in vitro corneal permeation of TMC-coated SL nanoliposomes,and the permeation parameters were calculated. Eseheriehia eoli,staphylo-eoeeus aureus,pseudomonas aeruginosa and baeillus subtilis were used as the tested bacterial strains and the in vitro antibacterial activity of the SL preparations was investigated to obtain the minimum inhibitory concentration(MIC),the minimum bactericidal concentration (MBC)and the relationship of bacterial inhibitory rate and time. Results:The order of steady permeation rate(J),corneal perme-ation coefficient(P)and corneal retention rate was TMC-coated SL nanoliposomes > SL nanoliposomes > SL eye drop. The order of lag time(τ)and corneal diffusion coefficient(D)was SL nanoliposomes > SL eye drop > TMC-coated SL nanoliposomes. The in vitro an-tibacterial activity showed the order of TMC-coated SL nanoliposomes > SL nanoliposomes > SL eye drop. Conclusion:Compared with the eye drop,liposomes can enhance the corneal permeation and storage of SL with improved antibacterial activity,and TMC-coating can further improve the permeation and antibacterial activity,which is worthy of further study.

There have been increasing reports on liver injury induced by traditional Chinese medicine (TCM) and natural medicine in recent years. The risk of liver injury induced by TCMs has attracted more attention at home and abroad. In this paper,epidemiologic characteristics,risk factors,clinical features of TCMs induced liver injury were discussed. The myth about research and safety evaluation of TCMs induced liver injury was analyzed. Based on the property of TCMs and characteristics of their clinical use,this paper proposed the priorities of basic and clinical safety evaluation of TCMs induced liver toxicity. It is hoped that this study may provide reference for scientific evaluation of liver toxicity of TCMs.

Objective To observe efficacy of acute promyelocytic leukemia (APL) by chemotherapy induction and treatment programs after remission.Methods 28 cases of newly diagnosed APL were treated with combined arsenic trioxide and retinoic acid which was called induced program,the patients whose leukocytes ＞10×109/L would be given anthracycline chemotherapy (DNR 40 mg × 3 d).Remission induction anthracycline chemotherapy was given after three courses of intensive therapy,the standard-dose cytarabine was used to the patients with high white blood.After the intensive treatment and with the recorery of the patient' s blood,bone marrow sequential therapy was used [arsenic trioxide (As2O3),retinoic acid (ATRA),6-MP + MTX and chemotherapy],during which recurrence rate and adverse reactions in the patient' s course of treatment were observed.Results Except 1 was died of intracranial hemorrhage at the beginning of treatment,the remaining 27 patients had received hematologic remission with PML/RARα fusion gene negative.Fusion gene of 5 patients remained negative even after maintenance treatment 2 years later.Conclusion As2O3,ATRA combined with chemotherapy in the treatment of APL is effective,the hematologic response time may be shortened,and sequential therapy can significantly reduce the relapse rate and hospitalization time,patient compliance is increased and the quality of life in patients is improved.

OBJECTIVE：To study the secretion of catecholamine primary cultures of chromaffin cells from rat adrenal medulla were used.METHOD:Catechoalmines(norepinephrine,epinephrine and dopamine) were measured by high-performance liquid chromatography-electrochemical detection technique.RESULTS:Catecholamine released by chromaffin cells with in 20min without slimalus was (73.29±15.32) ng/106 cells.When acetylcholine,nicotine or muscarine was added,the secretion of catecholamine was then increased.CONCLUSION:Using high-performance liquid chromatography-electrochemical detection technique,we can detect sensitively catecholamine released by cultured rat chromaffin cells.

OBJECTIVE:To analyze the causes of drug quality events took place in our hospital so as to provide reference for the improvement of drug quality.METHODS:Systematic investigations were performed on 150 batches of drugs that had shown quality problems during 2005 and 2006 in our hospital and the possible reasons accountable for the problems were analyzed.RESULTS & CONCLUSIONS:The quality problems were originated from 3 links including production,distribution and use of drugs,and manifested as improper or wrong packaging,labels or package inserts,inappropriate handling,and improper operation of medical staff etc,which worth the highest alert of the concerned departments.

microRNAs(miRNAs)are a class of 18～26 nt small non-coding single strand RNA molecules,which negatively regulate the expression of a variety of genes at post-transcriptional level by binding to complementary sites on target mRNA.Mutation,deletion or high expression of miRNA was found to correlate with various human cancers.miRNAs involved in tumor cell proliferation,differentiation and apoptosis processes as function as oncogenes or tumor supressors It is predictable that microRNA might be applied in the diagnosis and treatment of malignant tumors.

China ; Education, Dental ; statistics & numerical data