1.Detection of qacE△1-sul1 Gene in Pseudomonas aeruginosa Isolated from Burned Patients and Its Clinical Significance
Xihao HU ; Xiaomin XU ; Zuhuang MI ; Weiyun FENG ; Youfen FAN
Chinese Journal of Nosocomiology 1994;0(04):-
OBJECTIVE To investigate the disinfectant-resistant gene qacE△1-sul1 in Pseudomonas aeruginosa isolated from burned patients. METHODS GNS-448 and K-B tests were performed to detect the susceptibility of 19 kinds of antimicrobial agents against these strains. Genotype was analyzed by polymerase chain reaction(PCR) and verified by DNA sequencing. RESULTS The 32 strains isolated were all resistant to ampicillin,cefuroxime,cefoxitin,SMZ/TPM. The sensitive rates to amikacin and gentamicin were 68.0%,and 46.9%,respectively,the resistant rates to imipenem and meropenem were 68.8% and 59.4%,respectively. The positive rate of gene qacE△1-sul1 was 50.0%. CONCLUSIONS The resistance of P. aeruginosa isolated from burned patients is a serious issue.There is high positive percentage of qacE△1-sul1 gene in P. aeruginosa isolated from burned patients.
2.16S rRNA Methylase Gene and Aminoglycoside-modifying Enzyme Genes in Pseudomonas aeruginosa Isolated from Burned Patients
Xihao HU ; Xiaomin XU ; Zuhuang MI ; Youfen FAN ; Weiyun FENG
Chinese Journal of Nosocomiology 2009;0(13):-
OBJECTIVE To investigate the 16S rRNA methylase gene and aminoglycoside-modifying enzyme genes in Pseudomonas aeruginosa isolated from burned patients. METHODS GNS-448 and K-B tests were performed to detect the susceptibility to 19 kinds of antimicrobial agents against these strains. 16S rRNA methylase gene and aminoglycoside-modifying enzyme genes were amplified by polymerase chain reaction (PCR) and verified by DNA sequencing. RESULTS The 32 isolated strains were all resistant to ampicillin,cefuroxime,cefoxitin,SMZ-TMP,The sensitive rates to amikacin and gentamicin were 68% and 46.9%,respectively. The resistant rates to imipenem and meropenem were 68.8% and 59.4%,respectively. The 16S rRNA methylase gene and aminoglycoside-modifying enzyme genes including aac(6')-Ⅰb,aac(6')-Ⅱ,ant(3″)-Ⅰ,ant(2″)-Ⅰ and rmtB were found and positive rates were 9.4%,3.1%,28.1%,25.0% and 3.1%,respectively. A novel subtype of aac(6')-Ⅰb was reported firstly. CONCLUSIONS There are high positive percentage of 16S rRNA methylase gene and aminoglycoside-modifying enzyme genes in P. aeruginosa isolated from burned patients. P. aeruginosa resistance to aminoglycoside relates to the existence of 16S rRNA methylase gene and aminoglycoside-modifying enzyme genes.
3.Effect of microneedle combined with Lauromacrogol on skin capillary network: experimental study.
Sida XU ; Qiang WEI ; Youfen FAN ; Shihai CHEN ; Qingfeng LIU ; Guoqiang YIN ; Mingde LIAO ; Yu SUN
Chinese Journal of Plastic Surgery 2014;30(6):448-451
OBJECTIVETo explore the effect of microneedle combined with Lauromacrogol on skin capillary network.
METHODS24 male Leghone (1.5-2.0 kg in weight) were randomly divided into three groups as group A (microneedle combined with Lauromacrogol), B (microneedle combined with physiological saline) , and C(control). The cockscombs were treated. The specimens were taken on the 7th, 14th, 21th , and 28th day postoperatively. HE staining, immunohistochemical staining and special staining were performed for study of the number of capillary and collagen I/III , as well as elastic fibers.
RESULTSThe color of cockscombs in group A became lightening after treatment. The number of capillary decreased as showing by HE staining. The collagen I and III in group B was significantly different from that in group A and C (P < 0.05). Special staining showed proliferation of elastic fibers in group B.
CONCLUSIONSIt indicates that microneedle combined with Lauromacrogol could effectively reduce the capillary in cockscomb without any tissue fibrosis. Microneedle can stimulate the proliferation of elastic fiber, so as to improve the skin ageing process.
Animals ; Capillaries ; anatomy & histology ; Chickens ; Comb and Wattles ; blood supply ; drug effects ; Male ; Needles ; Polyethylene Glycols ; pharmacology ; Punctures ; instrumentation ; methods ; Random Allocation ; Skin Aging
4. Investigation of acquired drug-resistant genes and strains relationship in Pseudomonas aeruginosa isolated from burn patients
Youfen FAN ; Shengyong CUI ; Chun ZHANG ; Xiaomin XU
Chinese Journal of Burns 2018;34(2):83-87
Objective:
To investigate the acquired drug-resistant genes and strains relationship in 40 strains of
5.The influence of ulinastatin on body inflammatory factor levels in patients with severe burns
Cui CHEN ; Youfen FAN ; Lihua FAN ; Chun ZHANG ; Tianbin WU
China Modern Doctor 2014;(25):32-34
Objective To research the influence of ulinastatin on body inflammatory factor levels in patients with severe burns, and provide the basis treatment of patients with severe burns. Methods A total of 94 patients from Jan 2010 to June 2013 were studied in this test. The control group was treated with basic therapy including fluid infusion, antishock, cutting scab surgery and early nutrition support while the treatment group was received ulinastatin on the basic of control. Routine blood, body inflammatory factors level change and APACHE II score were compared between the two groups, Results The number of WBC and neutrophil in treatment group was higher than control 1group (P <0.05), while the PLT was lower than control group (P<0.05). The APACHE II score was in the same level between the two groups before treatment, while the score of treatment group was obvious lower than control control group after 72hr (P<0.05). The TNF-α and IL-6 in treatment group was lower than control wihle the IL-2 and IL-10 was higher than control(P<0.05). Conclusion Ulinastatin played an important role in improving the patient's body state of inflammation, the patient's symptom and preventing complications.
7.MicroRNA-16 inhibits cell proliferation and migration by targeting heat shock protein 70 in heat-denatured dermal fibroblasts
Chun ZHANG ; Jinhua DAI ; Youfen FAN ; Xianghui HE ; Renxiong WEI
The Korean Journal of Internal Medicine 2019;34(3):634-642
BACKGROUND/AIMS:
This study aimed to investigate the precise mechanism and function of miR-16 in heat-denatured primary human dermal fibroblasts.
METHODS:
Primary human dermal fibroblasts were separated from normal human skin samples. Under heat stress, the levels of miR-16 and heat shock protein 70 (HSP70) were detected in primary human dermal fibroblasts by quantitative real-time polymerase chain reaction (qRT-PCR). Next, heat-denatured cells were transfected with synthetic scrambled negative control (NC) RNA (NC group), miR-16 mimics, miR-16 inhibitor or miR-16 inhibitor accompanied by small interfering RNA targeting HSP70, then the mRNA level of HSP70 was detected by qRT-PCR, cell proliferation was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and AlamarBlue assay, cell migration was examined by Transwell assay and cell apoptosis was assessed by transferase dUTP (deoxyuridine triphosphate) nick end labeling (TUNEL) assay. In addition, cell apoptosis-related proteins, Bax and Bcl-2, were detected by Western blotting.
RESULTS:
Heat stress significantly reduced miR-16 level and increased the mRNA level of HSP70 compared with untreated cells (p < 0.05). Overexpressed miR-16 reduced the mRNA level of HSP70, suppressed cell proliferation (p < 0.05 or p < 0.01), migration (p < 0.05), and promoted cell apoptosis (p < 0.001) compared with the NC group. Down-regulated miR-16 exerted an opposite effect on primary human dermal fibroblasts with heat-denaturation. Furthermore, effects of miR16 down-regulation on cell proliferation and migration were reversed by HSP70 silence.
CONCLUSIONS
MiR-16 might have an inhibitory effect on cell proliferation and migration in heat-denatured human dermal fibroblasts, and HSP70 might be associated with the cell proliferation and migration as a target gene of miR-16.
8. Five patients with severe burns complicated by fungal infection
Youfen FAN ; Cui CHEN ; Jiliang LI ; Neng HUANG ; Shengyong CUI
Chinese Journal of Burns 2019;35(3):221-223
From June to November 2016, 5 patients with severe burns were admitted to our unit. Broad-spectrum antibiotic and fluconazole were used on patients as earlier empirical anti-infection therapy of bacteria and fungi. Seven to twenty-one days after injury, 5 patients developed fungal infection. Antifungal agents of caspofungin, voriconazole, and amphotericin B liposomewere were used according to the results of fungal culture, and the infected wounds were also treated with repeated debridement and dressing change. Multiple autologous skin grafts were performed after infection control of wounds. With the above antifungal infection treatment for 5 to 11 days, 2 patients′ condition tended to be stable, and no fungus was found in wound secretion after cultured for many times. The patients were discharged with wounds healed after 52 to 54 days′ hospital stay. Due to severe burns degree and or elder age, fungal infection aggravated and expanded to the trunk in the other 3 patients, then developed into burn sepsis, resulting in patients died of multiple organ failure secondary to sepsis.
9. Epidemiological investigation of 511 adult inpatients with gas burns
Youfen FAN ; Cui CHEN ; Yanyan PAN ; Shengyong CUI ; Neng HUANG ; Jiliang LI ; Pei XU ; Yaohua YU
Chinese Journal of Burns 2020;36(1):58-63
Objective:
To analyze the epidemiological characteristics of adult inpatients with gas burns in the Department of Burns of Hwa Mei Hospital of University of Chinese Academy of Sciences (hereinafter referred to as the author′s unit) , so as to provide evidence for the prevention of gas burn.
Methods:
Medical records of all inpatients with flame burns admitted to the author′s unit from January 2011 to December 2017 were collected. The percentage of adult inpatients with gas burns in total inpatients with flame burns in the same period, and their gender, age, injury season, accident place, burn severity, common compound injury, complication, population caliber, education, industry, as well as the pre-injury disease and prognosis of elderly inpatients with gas burns were retrospectively analyzed. In addition, the age, accident place, education, and industry of the floating population in the adult inpatients with gas burns were analyzed separately and compared with the total population of adult inpatients with gas burns in 7 years. Data were processed with chi-square test or Fisher′s exact probability test (Monte Carlo algorithm).
Results:
During the 7 years, 1 490 inpatients with flame burns were admitted to the author′s unit, among which 511 were adult inpatients with gas burns, accounting for 34.30%. The number of adult inpatients with gas burns increased gradually during the 7 years, but its percentage in the total inpatients with flame burns during the same period showed no significant difference (