2.The study of genome DNA methylation in rheumatoid arthritis
Xiao-Yan XU ; Mei-Mei WANG ; Chuan-Shi XIAO ; Xiao-Feng LI ; Lai-Yuan WANG ;
Chinese Journal of Rheumatology 2003;0(08):-
Objective To study the genome DNA methylation in rheumatoid arthirits(RA)and the re- lated factors of DNA methylation.Methods Twenty-first cases with RA and 20 controls were recruited to par- ticipate the study.Plasma Hcy,SAM,SAH,the MTHFR gene C677T polymorphism and the expression of LFA-1 in CD4~+T cells was measured in all patients and controls.Results①The SAM levels were lower sig- nificantly in RA groups than in controls.The SAH levels were higher significantly in RA groups than in con- trols.②There was significant inverse correlation between plasma Hcy level and SAM level(r=-0.932,P<0.01). There was significant positive correlation between plasma Hcy level and SAH level(r=0.924,P<0.01).③The expression of LFA-1 in CD4~+T cells was higher significantly in RA groups than in controls.There was a signif- icant positive correlation between LFA-1 expression level and Hcy level(r=0.557,P<0.01),a significant in- verse correlation between LFA-1 expression level and SAM level(r=-0.651,P<0.01).④The MTHFR gene mu- tation lead to dramatically increase of Hcy,SAH level and the expression of LFA-1 level in CD4~+T cells and genome DNA hypomethylation.Conclusion①Hypomethylation of genome DNA is found in most RA pa- tients.②The factors associated with genome DNA hypomethylation include MTHFR gene mutation and hyper- homocysteinemia.③The expression of LFA-1 in CD4~+ T cells is higer in RA groups than in controls,which re- lates to the DNA methylation level and the MTHFR gene C677T polymorphism.
3.The Progress of Biological Research of Medicinal Fungus Shiraia bambusicola
Xiao-Ming JIA ; Xiao-Hong XU ; Bai-Chuan ZHUANG ; Hai-Ping LIN ;
Microbiology 1992;0(03):-
The research status is reviewed on taxonomic position, ecology, biological active matter and artificial cultivation of Shiraia bambusicola. Following problems are presented: whether there are new species and host specificity of Shiraia bambusicola. Since the artificial cultivation of stroma of Shiraia bambusicola has not been success, Shiraia bambusicola is in situation of emerge of itself and perish of itself so that it is not beneficial to resource protection and continual utilization of this medicinal fungus. It is pointed out that molecular biology of Shiraia bambusicola should be further researched and technology of artificial cultivation of Shiraia bambusicola should be explored in order to exploit and usage of Shiraia bambusicola.
4.Clinical significance of detection of tumor suppressor genes aberrant methylation in cervical carcinoma tissue
Jun XU ; Hong-Lin WANG ; Gao-Chuan LU ; Zhi-Jie WANG ; Xiao LIN ; Hong-Wei ZHOU ;
Chinese Journal of Obstetrics and Gynecology 2001;0(06):-
0.05).(4) Significant differences between CC and CIN Ⅰ for p16,CDH1,RASSF1A and TIMP3 genes(P
5.Comparison of Pattern-pulse and Pattern-reversal Multifocal Visual Evoked Potentials in Normal Individuals.
Rong-ting ZHU ; Xing-ben LIU ; Xiao-ming XU ; Chuan-fei ZHENG
Journal of Forensic Medicine 2016;32(1):35-39
OBJECTIVE:
To compare pattern-pulse multifocal visual evoked potential (PPmfVEP) with pattern-reversal multifocal visual evoked potential (PRmfVEP), and to investigate the symmetry of mfVEP between both eyes in normal individuals.
METHODS:
The multifocal Vision Monitor was used to observe the mfVEP. T-test and ANOVA were used to analyze P1 wave, amplitude and signal noise ratios (SNR) of two mfVEPs.
RESULTS:
The SNR and the P1 amplitude reached the maximum at the central visual field and decreased with the increase of eccentricity, and then decreased slowly. The amplitude of the PPmfVEP was significantly smaller than the PRmfVEP in the central retina, while in the peripheral retina the result was exactly the opposite. SNR and amplitude of the PRmfVEP showed no statistical difference in both eyes (P > 0.05). The variance of the amplitude at the same side of visual field was larger than that at the symmetrical visual quadrant.
CONCLUSION
mfVEP can reflect the visual function in different parts of retina objectively and exactly. PPmfVEP reflect the vision function of the central retina better than PRmfVEP. The stability of PPmfVEP is better than PRmfVEP in the central retina, while the result is opposite in the peripheral retina. The mfVEP is symmetrical in both eyes of the same individual.
Evoked Potentials, Visual/physiology*
;
Humans
;
Neurologic Examination
;
Reference Values
;
Retina
;
Sensitivity and Specificity
;
Visual Fields/physiology*
6.Detection of growth phenotype and blood biochemical parameters of wild type-derived chromosome 1 substitution mouse strain
Chuan GAO ; Wei XU ; Fuyi XU ; Yaoqi ZHANG ; Ying ZHAO ; Liya ZHAO ; Yuxun ZHOU ; Kai LI ; Junhua XIAO
Acta Laboratorium Animalis Scientia Sinica 2015;(3):233-238
Objective To analyze the growth phenotype and blood biochemical parameters of chromosome 1 substi-tution mouse strain(CSS1), and investigate their potential of QTL mapping .Methods Body weight, body length, tail length, organ weight of the CCS1 mice were measured at different days to create a growth curve while blood biochemical in -dexes were measured at about the 80th day.Results The CCS1 mice were different from C57BL/6 mice in several inde-xes.Compared with the C57BL/6 mice during different developmental stages , six strains including B6-Chr1KM mice were significantly different in body weight .There were five strains including B6-Chr1CM mice significantly different with C57BL/6 mice in body length, and all of the CSS1 mice were significantly different from C57BL/6 mice in tail length.Part of CCS1 mice were significantly different from C57BL/6 mice in the weight of liver, spleen, kidney and brain.The ALT of female B6-Chr1CM mice was significantly higher than that in the C 57BL/6 mice.The ALP of female B6-Chr1HZ mice was signifi-cantly higher than that in the male C57BL/6 and B6-Chr1KM mice, and was significantly lower than that in the C57BL/6 mice.The TB of male B6-Chr1CM, B6-Chr1SMX and B6-Chr1HZ mice was significantly higher than that of the C 57BL/6 mice.The TG of male B6-Chr1SMX mice and male B6-Chr1TW mice was significantly higher than that in the C 57BL/6 mice. Conclusions The phenotype of Chr1 CSS mice is quite different from commonly used inbred strain C 57BL/6 mice.CCS1 mice show great potential in QTL mapping for their characteristic growth phenotype and blood biochemical indexes .
7.Permeability research of human temporomandibular joint disc and cartilage.
Xiao-chuan XU ; Meng-shi CHEN ; Xin-zhu YI
West China Journal of Stomatology 2006;24(3):254-256
OBJECTIVETo measure the permeability of human temporomandibular joint (TMJ) disc and cartilage to provide basic parameter for oral biomechanics and tissue engineering, and analyze its mechanisms of pathology and load-release.
METHODSConfined compression method was used to measure the permeability (k value) of four cadavers' TMJs, which were sampled into three parts: disc, condyle and glenoid fossa with different diameters (2 mm, 3 mm and 4 mm). All 128 samples were tested with correspond diameter indenter.
RESULTSLarger the sample diameter was, higher the k value became. The highest k value appeared in the disc while the lowest appeared in glenoid fossa.
CONCLUSIONIn normal condition, TMJ can suffer huge load by decreasing its permeability. Disc is weakest for the higher permeability, it's easy-damaged region is an initiated factor of TMJ disease.
Cartilage ; Humans ; Permeability ; Temporomandibular Joint Disc ; Tissue Engineering
8.Analysis of current γ knife stability testing status in medical institutions
HU Chuan peng HUANG Wei xu ZHAI He zheng CHENG Xiao jun ZHANG Lei JIA Chen zhi
China Occupational Medicine 2022;52(04):464-
Abstract: Objective
To follow up and evaluate the stability testing status of γ stereotactic radiotherapy system (hereinafter
γ knife WS 582-2017 Specifications for Testing of Quality Control in X and γ
referred to ) in medical institutions based on the
RayStereotactic Radiotherapy System WS 582-2017 Methods
(hereinafter referred to ). A total of 43 medical institutions using
γ knife and 54 medical physics personnel were recruited as the research subjects by random sampling method. Based on the
- -
standard tracking evaluation method, we followed up the evaluation of γ knife stability testing based on WS 582 2017.
Results -
Only 66.7% of the 54 subjects preformed WS 582 2017 in their daily work. Only 30.2% (all were tertiary hospital) of
43 medical institutions were equipped with complete quality control and testing equipment. The implementation rate of γ knife
stability test was 67.4%, and it was not carried out in strict accordance with the test events and test cycle requirements
-
specified in the WS 582 2017. There were incomplete test events, incomplete records or test cycles that did not meet the
Conclusion
standard requirements in γ knife stability test. Medical institutions did not carry out γ knife stability tests in strict
-
accordance with the projects and cycle required by the WS 582 2017. The reasons are related to medical institutions are not
equipped with complete testing equipment, the personnel are lack of understanding of relevant national standards, the poor
publicity and implementation of the standards, the lack of standardized training channels and inadequate health supervision.
9.FEM study on displacement, position of rotation center and stress distribution of PDL under various loading force systems.
Dong-xu LIU ; Chun-ling WANG ; Chuan-yun FU ; Xiao-yan ZHANG ; Xiao-zhong ZHENG
West China Journal of Stomatology 2004;22(3):192-195
OBJECTIVETo investigate the displacement, the position of rotation center and the stress distribution of PDL under different loading force system (Moment/Force, M/F) by simulating clinical loading force system.
METHODSA three-dimensional finite element model of upper central incisor, which consists of 945 isoparametric elements and 1,245 nodes was developed. The displacement, the position of the rotation center and the stress distribution of PDL were analyzed under 13 types of loading force system.
RESULTS1. Different force system led to different types of tooth movement. When M/F= -9.15:1, -10.30 - -10.50:1 and -10.90:1, it brought the result of controlled tipping movement, the bodily movement and the root movement; 2. The graph of the center rotation was a hyperbolic asymptotic line: Mx/Fy = -10.50 (horizontal axis) and L = 6.75 (vertical axis). Moreover, a little change of M/F between -9.15 and -10.90 led to apparent change of the position of rotation center. 3. The maximum strain and stress during the tipping movement were 1.47 x 10(-2) MPa and -2.81 x 10(-2) MPa, and during the bodily movement the results were 1.10 x 10(-2) MPa and -1.86 x 10(-2) MPa, while during the root movement were 0.96 x 10(-2) MPa and -2.58 x 10(-2) MPa.
CONCLUSION1 . Different force system (M/F) leads to different types of tooth movement. 2. It is necessary to adjust the force system accurately to obtain prescient tooth movement, especially when M/F changes between -9.15:1 and -10.90:1. 3. This study suggested that the tooth movement style and the force system (M/F) should be controlled to protect the periodontal tissue.
Dental Stress Analysis ; Finite Element Analysis ; Humans ; Incisor ; physiology ; Models, Biological ; Periodontal Ligament ; physiology ; Tooth Movement Techniques
10.Early and delayed castrations confer a similar survival advantage in TRAMP mice.
Zai-Xian ZHANG ; Qing-Quan XU ; Xiao-Bo HUANG ; Ji-Chuan ZHU ; Xiao-Feng WANG
Asian Journal of Andrology 2009;11(3):291-297
The most appropriate time to introduce androgen deprivation therapy for prostate cancer remains controversial. Our aim was to evaluate the effects of early versus delayed surgical castration on prostate cancer progression and survival in the transgenic adenocarcinoma of the mouse prostate (TRAMP) model. TRAMP mice were randomly divided into three groups: the early castration group (on which castration was performed at the age of 4 weeks), the delayed castration group (on which castration was performed when abdominal tumours could be palpated), and the sham-castrated group. Mice were monitored daily throughout their lives until cancer-related death or the development of an obviously moribund appearance, at which time the individual mouse was killed. Androgen receptor expression in prostate tumours was also evaluated. The results shows that the average lifespan in early castration, delayed castration and sham-castrated groups were 54.1 weeks, 59.9 weeks and 39.1 weeks, respectively. Both early castration and delayed castration conferred a statistically significant survival advantage when compared with the sham-castrated group (P<0.001). However, the difference in lifespan between the early castration group and the delayed castration group was not statistically significant (P=0.85). The increase in lifespan in the TRAMP mice that received either early or delayed castration correlated with lower G/B value (genitourinary tract weight/body weight) at death than the sham-castrated mice. In conclusion, early and delayed castrations in TRAMP mice prolonged survival to a similar extent. This finding may provide a guide for clinical practice in prostate cancer therapy.
Adenocarcinoma
;
mortality
;
pathology
;
surgery
;
Animals
;
Body Weight
;
Disease Models, Animal
;
Kaplan-Meier Estimate
;
Male
;
Mice
;
Mice, Inbred C57BL
;
Mice, Transgenic
;
Orchiectomy
;
Organ Size
;
Prostate
;
metabolism
;
pathology
;
surgery
;
Prostatic Neoplasms
;
mortality
;
pathology
;
surgery
;
Receptors, Androgen
;
metabolism
;
Time Factors
;
Transgenes
;
genetics