ObjectiveTo review the characteristics of human defensin 5 (HD-5), including molecular structure, antibacterial activity and gene expression, and to show its development prospect as a new drug in the treatment of enterogenic infection. MethodsThe published papers about HD-5 were reviewed to summarize its research progress. ResultsBeing a 3-5 KDa cationic peptide rich in cysteine and arginine, especially without glycosylated side-chain, HD-5 plays its antibacterial role against positive and negative Gram’s bacterium, fungi, spirochete, protozoan and enveloped virus with the special active center composed of three disulfide bonds. HD-5 encoding gene alpha defensin 5 (DEFA5) localizes at the 8th chromosome P21-pter with 449 bp, which includes five pieces of sequence: 5′ untranslated region (1-40)，signal peptide (41-97), propiece (98-226), mature peptide (227-322)，and Poly A (433-438).ConclusionAs a broad-spectrum and effective endogenous antimicrobial peptide, HD-5 would be a promising alternative peptide against enterogenic infection if the accessibility to its mass production is settled.
Objective To provide references for the rational allocation of health personnel in rural hospitals through understanding the status of health human resources of rural hospitals in remote and poor areas of Sichuan Province. Methodes This study used cluster sampling method, combined with questionnaire survey and qualitative interviews. A total of 711 health workers of 29 rural hospitals in Pengzhou and Baoxing of Sichuan Province were interviewed. SPSS16.0 was used for descriptive analysis.Results The average age of rural hospitals health personnel in remote and poor areas of Sichuan Province was 30 years old. Post-secondary education accounted for 58.12%, and Bachelor degree or above accounted for 7.2%. The number of medium and senior professional titles account for 8.4 %. The ratio of doctors to nurses was 1:0.55. In the survey of health workers, those doctors with practice (assistant) license accounted for 38.5%, and those without any qualification occupied 27.1 %. Conclusions The professional titles of medical personnel of rural hospitals in remote and poor areas in Sichuan province are generally low. The distribution of professional categories is irrational. The staff in charge of prevention and care are inadequate. There exist a large number of unqualified medical workers. Therefore, the government should increase the investment in rural health and take measures to stabilize the team structure, introduce the talented, and strengthen the training for health personnel of rural hospitals to improve their overall quality.
ObjectiveTo summarize the recent research progress on pathogenesis of human arrest defective 1(ARD1) protein in colorectal cancer and treatment process. MethodsSearched the related literatures from the databases such as CNKI, PubMed and so on, the relevant ARD1 in the development, diagnosis and treatment of colorectal cancer were reviewed. ResultsARD1 has effect of anti colorectal cancer, it can inhibit the proliferation and promote apoptosis of colorectal cancer cells, and improve the sensitivity of colorectal cancer cells to anticancer drugs at the cellular level. The treatment is mainly through the induction of cancer cell apoptosis or (and) decreased the proliferation ability of cancer cells, thus delaying the disease process. However, it is still in the research stage of animal experiments, which can not be directly applied to clinical practice. Conciusions ARDl study on the mechanism of anti colorectal cancer cells has become the focus of research with animal research and promotion, and provide new therapy concepts and measures for diagnosis and treatment of colorectal cancer.
OBJECTIVE This paper was to study the biological characteristics of the transformed human embryonic tendon cells, the relation between cell growth and culture conditions, and to compare these features with that of human embryonic tendon cells. METHODS The pts A58H plasmid had successfully used to transform a tendon cell line from human embryo in our past work. The human embryonic tendon cells and the transformed human embryonic tendon cells were cultured in vitro. In different culture conditions, the growth curve were drawn respectively. Population dependence and proliferation capability of the cells were investigated through plate cloning test and soft agar culture. The collagen secreted by cells was identified by immunohistochemical method. RESULTS In routine culture condition, the growth properties of the human embryonic tendon cell and transformed cells were almost identical. The growth properties of the transformed cells were not changed when the cells were frozen storage. There were changes of growth characteristics of the transformed cells when the culture temperature was changed. The transformed cells could subcultured continually and permanently. The proliferation capability of the transformed cells were ber than that of the human embryonic tendon cells. Moreover, the growth of the transformed cells was serum-dependent, and the phenomenon of contact inhibition was observed. The transformed cells were not able to grow on soft agar culture. They had the capacity of secreting collagen type I. CONCLUSION The transformed human embryonic tendon cells could be subcultured continually and permanently, and their growth could be controlled by changing their culture conditions and they had no malignant tendency in biological characteristics. They could be taken as an ideal experimental material for tendon engineering.
Schwann cells (SC) play an important role in nerve regeneration. The cultures of both human and rabbit SC (gt;99%) were obtained, and were separately derived from the sciatic nerve of the human fetus and the rabbit respectively by "the method of reexplantation". In addition, the cryostore and resuscitation of SC were carried out, and the resuscitated cells could retain their growth properties.
Human fibroblasts and human epidermal keratinocytes were used for culture. Chitosan solution were added in the culture solution(DMEM). After 72 hours, the fibroblasts showed rapid growth in the control culture without Chitosan, But the numbers of human fibroblasts from growth was decreased as the concentration of Chitosan was increasing. On the contrary the human epidermal keratinocytes growed more rapidly in the culture with Chitosan than in the culture without Chitosan. The results showed that Chitosan inhibited the growwth of human fibroblast and stimulated the growth of human epidermal keratinocyte .
Objective To explore effects of zinc on the contents of cycl in D2, cycl in-dependent kinase 4 (CDK4), and their DNA and total cellular protein in human umbil ical cord blood-drived mesenchymal stem cells (hUCBMSCs). Methods hUCBMSCs were isolated and cultured by density gradient centrifugation adherence method in vitro. At the serial subcultivation, the hUCBMSCs were randomly divided into 7 groups. In control group, hUCBMSCs were cultured with DMEM medium (containing 15%FBS). In treatment groups, hUCBMSCs were cultured with DMEM medium (containing 15%FBS plusZnSO4•7H2O). The final concentrations of zinc were 0.5, 1.5, 2.5, 3.5, 4.5, and 5.5 mg/L, respectively. The cellular surface antigens of CD29, CD34, CD44, and CD45 at the 3rd generation of hUCBMSCs were detected by flow cytometry. MTT assay was used to detect cell activity of the 3rd generation of hUCBMSCs. The optimum concentration of zinc was selected by the results of MTT as experimental group. The cell growth curves of experimental group and control group were drown by counting cell. The cell surface antigen, reproductive cycle, and DNA content were detected by flow cytometry motheds. The contents of cycl in D2 and CDK4 were detected by Western blot method. Results The positive expression rates of CD29 and CD44 were more than 70% in hUCBMSCs. The cell activity of 2.5 mg/L treatment group was superior to other treatment groups, as experimental group. At 7, 14, and 28 days, the contents of DNA, total cellular protein, cycl in D2, and CDK4 of hUCBMSCs were significantly higher in experimental group than those in control group (P lt; 0.01). The percentage of hUCBMSCs at S stage and prol iferation index in experimental group were also significantly higher than those in control group (P lt; 0.01). Conclusion Zinc (0.5-4.5 mg/L) has the promoting effect on the hUCBMSCs activity, and 2.5 mg/L is the optimal concentration. Zinc (2.5 mg/L) can accelerate the prol iferation and DNA reproduction of hUCBMSCs and increase the contents of cycl in D2 , CDK4, and cellular total protein.
Five fresh human forearms removed from cadavers were used to study the vascular concentration of the flexor digital tendons by stereology method. The results showed: (1) The Vv is 0.45%, and Lv is 1.9; (2) The vascular concentration of the flexor digital tendons of different fingers showed no significance statistically; (3) The vascular concentration of the tendons within the digital sheath was less than that outside the digital sheath (plt;0.01); (4) The vascular concentration of the tendons were decreasing gradually form the thum dto litter finger.
The Human Cell Atlas project is an international collaboration following the Human Genome Project, which aims to establish a reference map for the characterization of all human cells. Recent years, the project has brought together various different types of cell atlas, mostly focusing on the cell types of individual tissues and organs. Science published the latest research results of the Pan-tissue Human Cell Atlas on 12 May 2022, which integrates cell atlas of multiple tissues and organs in the human. It contributes to a more comprehensive understanding of disease pathogenesis, vaccine development, cell engineering, tumor immunity, and regenerative drug development.
In recent years, the incidence rate of ischemic stroke in people living with HIV/AIDS (PLWHA) is increasing, attracting wide attention from scholars at home and abroad. In addition to traditional risk factors of stroke, the secondary ischemic stroke in PLWHA is also affected by HIV infection. This study reviews the incidence rate and risk factors of secondary ischemic stroke in PLWHA, in order to provide a theoretical basis for preventing and reducing the incidence of ischemic stroke in PLWHA.