A twin study in Qingdao and Lishui: heritability of exercise participation and sedentary behavior / 中华流行病学杂志

<p><b>OBJECTIVE</b>To investigate both genetic and environmental influences on the exercise participation and sedentary behavior in Qingdao, Shandong province and 326 in Lishui, Zhejiang province.</p><p><b>METHODS</b>568 twin pairs, including 242 in Qingdao and 326 in Lishui, were studied. Exercise participation was measured by two questions on the frequency and intensity and then divided into two groups. Sedentary behavior was measured by one question as 'how long do you spend on sitting every day'. Variance component models based on twins was used to estimate the genetic and environmental factors on these traits.</p><p><b>RESULTS</b>The average age in monozygotic twins was (41.14 ± 10.11)while in dizygotic twins it was (41.23 ± 9.89). Genetic factors accounted 78% (35%-96%) and 59% (0-94%) for exercise participation variance in Qingdao and Lishui in people aged between 20 and 40. However, there were no heritability noticed on physical activity in people older than 40 years of age. Rates of heritability on sedentary behavior in Qingdao and Lishui were 68% (59%-75%) and 32% (7%-62%), respectively.</p><p><b>CONCLUSION</b>Results from the study suggested that sedentary behavior in Chinese people was influenced by genetic factors, which could also explain much of the exercise participation variance in people aged between 20 and 40.</p>

Relationship between finger dermatoglyphics and body size indicators in adulthood among Chinese twin population from Qingdao and Lishui cities / 中华流行病学杂志

<p><b>OBJECTIVE</b>To study the correlation between fingerprints and body size indicators in adulthood.</p><p><b>METHODS</b>Samples were composed of twins from two sub-registries of Chinese National Twin Registry (CNTR), including 405 twin pairs in Lishui and 427 twin pairs in Qingdao. All participants were asked to complete the field survey, consisting of questionnaire, physical examination and blood collection. From the 832 twin pairs, those with complete and clear demographic prints were selected as the target population. Information of Fingerprints pixel on the demographic characteristics of these 100 twin pairs and their related adulthood body type indicators were finally chosen to form this research. Descriptive statistics and mixed linear model were used for data analyses.</p><p><b>RESULTS</b>In the mixed linear models adjusted for age and sex, data showed that the body fat percentage of those who had arches was higher than those who did not have the arches (P = 0.002), and those who had radial loops would have higher body fat percentage when compared with ones who did not (P = 0.041). After adjusted for age, there appeared no statistically significant correlation between radial loops and systolic pressure, but the correlations of arches (P = 0.031)and radial loops (P = 0.022) to diastolic pressure still remained statistically significant.</p><p><b>CONCLUSION</b>Statistically significant correlations were found between fingerprint types and body size indicators, and the fingerprint types showed a useful tool to explore the effects of uterine environment on health status in one's adulthood.</p>

A twin study in Qingdao and Lishui:heritability of exercise participation and sedentary behavior / 中华流行病学杂志

Objective To investigate both genetic and environmental influences on the exercise participation and sedentary behavior in Qingdao,Shandong province and 326 in Lishui, Zhejiang province. Methods 568 twin pairs,including 242 in Qingdao and 326 in Lishui,were studied. Exercise participation was measured by two questions on the frequency and intensity and then divided into two groups. Sedentary behavior was measured by one question as‘how long do you spend on sitting every day’. Variance component models based on twins was used to estimate the genetic and environmental factors on these traits. Results The average age in monozygotic twins was(41.14 ± 10.11)while in dizygotic twins it was(41.23 ± 9.89). Genetic factors accounted 78%(35%-96%)and 59%(0-94%)for exercise participation variance in Qingdao and Lishui in people aged between 20 and 40. However,there were no heritability noticed on physical activity in people older than 40 years of age. Rates of heritability on sedentary behavior in Qingdao and Lishui were 68%(59%-75%)and 32%(7%-62%),respectively. Conclusion Results from the study suggested that sedentary behavior in Chinese people was influenced by genetic factors,which could also explain much of the exercise participation variance in people aged between 20 and 40.

A twin study in Qingdao and Lishui:heritability of exercise participation and sedentary behavior / 中华流行病学杂志

Objective To investigate both genetic and environmental influences on the exercise participation and sedentary behavior in Qingdao,Shandong province and 326 in Lishui, Zhejiang province. Methods 568 twin pairs,including 242 in Qingdao and 326 in Lishui,were studied. Exercise participation was measured by two questions on the frequency and intensity and then divided into two groups. Sedentary behavior was measured by one question as‘how long do you spend on sitting every day’. Variance component models based on twins was used to estimate the genetic and environmental factors on these traits. Results The average age in monozygotic twins was(41.14 ± 10.11)while in dizygotic twins it was(41.23 ± 9.89). Genetic factors accounted 78%(35%-96%)and 59%(0-94%)for exercise participation variance in Qingdao and Lishui in people aged between 20 and 40. However,there were no heritability noticed on physical activity in people older than 40 years of age. Rates of heritability on sedentary behavior in Qingdao and Lishui were 68%(59%-75%)and 32%(7%-62%),respectively. Conclusion Results from the study suggested that sedentary behavior in Chinese people was influenced by genetic factors,which could also explain much of the exercise participation variance in people aged between 20 and 40.

Gene expressions of LOXs and MMPs of the ACL fibroblasts cells co-cultured with synovial cells / 生物医学工程学杂志

The progress of research on the the anterior cruciate ligament (ACL) wound healing demonstrates that the synovial tissue in the knee joint plays a very important role in the healing process of injured ACL. Therefore, the molecular response mechanisms of lysyl oxidase (LOX) and matrix metalloproteina (MMP) in normal/injured ACL fibroblast cells could be considered to perform the major analysis function of injured ACL healing mechanism. The mRNA expressions of LOXs and MMPs and the activity expressions of MMP-2 in ACL fibroblasts co-cultured with synovial cells were analyzed by quantitative real-time PCR and zymography. The results showed that co-culture could regulate the mRNA expressions of LOXs and MMPs in the ACL fibroblasts cells. These results suggest that the differential expressions of LOXs and MMP-1, 2, 3 in co-cultured ACL indicate that interaction crosstalk do exist between ACL cells and synovial cells and provide a theoretical basis for subsequent exploration of the mechanisms and treatment of ACL injury and repair.

Effect of titanium particles and TNF-alpha on the gene expression and activity of MMP-1, 2, 3 in human knee joint synovial cells / 生物医学工程学杂志

This paper is aimed to investigate the effect of titanium (Ti) particles and tumor necrosis factor alpha (TNF-alpha) on the expressions of MMP-1, 2, 3 in human synovial cells, so as to explore the possible mechanism of osteolysis post-operation of metal-on-metal total joint arthroplasty in human synovial cells induced by Ti particles. In vitro cell cultures, human synovial cells were treated by Ti particles and/or TNF-alpha. The total RNA was isolated at 2 hours after the treatment. The gene expression of MMP-1, 2, 3 was analyzed by Semi-quantitative Reverse-transcriptional PCR and quantitative real-time PCR. Cell supernatant was collected at 12, 24, 48 hours after the treatment and Gelatin zymography was performed to detect the activity of MMP-2. Compared to those in the control group (untreated), Ti particles and TNF-alpha increased the gene expression of MMP-1, 2, 3 respectively (P < 0.05), and the effect of combination of the two was even more significant (P < 0.01). The trend of activities of MMP-2 is similar with gene expression. Ti particles and TNF-alpha increased MMP-2 activities by 1.3 times and 1.5 times respectively (P < 0.05), and the combination of the two increased by 1.7 times (P < 0.01). Ti particles and TNF-alpha-induced the stimulation of MMP-1, 2, 3 expressions and MMP-2 activities in human knee joint synovial cells may be involved in aseptic loosening after metal-on-metal arthroplasty through increasing the degradation of bone matrix and declining of osseous support structure mechanics.

Biomechanical study on bone marrow-derived mesenchymal stem cells promoting tendon-bone healing following anterior cruciate ligament reconstruction / 中华创伤杂志

Objective To observe the effect of bone marrow-derived mesenchymal stem cells (bMSCs) on graft healing within a bone tunnel after anterior cruciate ligament (ACL) reconstruction in rabbits.Methods The study involved 24 New Zealand white rabbits undergone ACL reconstruction with an autologous ipsilateral gastrocnemius tendon graft.Both hindlimbs were included.In one hindlimb,graft coated with fibrin glue compound by bMSCs was employed (bMSCs group).Whereas in the contralateral hindlimb,graft coated with fibrin glue without cells was employed (control group).At postoperative 2,4,6 and 8 weeks,specimens were harvested to have a biomechanical test of tensile strength and stiffness of tendon-bone interface.Results Tensile strength and stiffness of tendon-bone interface in both experiment and control groups presented a rising trend with the prolong of repair time.In contrast,significantly higher tensile strength and stiffness of tendon-bone interface were observed in experiment group since the 6 weeks (P ＜ 0.05).Conclusion bMSCs transplantation significantly enhances the early tensile strength and stiffness at tendon-bone interface after ACL reconstruction in rabbits and improves the graft healing within a bone tunnel.

Efficacy and safety of multiple vitamin E, C, B facial mask for 117 patients with acne vulgaris / 中国新药与临床杂志

AIM: To evaluate the efficacy and safety of multiple vitamin E, C, B facial mask for the patients with acne vulgaris. METHODS: One hundred and seventeen patients aged over 13 a, with acnes mainly sited on the face and an acne severity rating above grade 2 were enrolled in this study. The mask treatment was used once a day with 8 wk as a course.The primary endpoint included the number and the degree of acne lesions including comedoes, papules, pustules and cysts. The secondary endpoint was the overall efficacy evaluation by the physicians. RESULTS:After 8 wk of treatment with multiple vitamin E, C, B facial mask, the mean number of acne lesions:comedoes, papules, pustules and cysts decreased 13 + s 13,10 ± 12, 5 + 7 and 3 + 3, respectively. These changes were statistically significant (P ＜ 0.01 ). The results of overall efficacy evaluation showed that 7 patients '(6.0 % ) symptom was greatly improved, 44 patients '(37.6 % ) symptoms were moderately improved, 56patients'(47.9 % ) symptoms were slightly improved,and 10 patients' symptoms did not change. Among all 117 patients, 59 patients (50.4 % ) showed no adverse reactions, including swelling, redness, itching,burning or scaling. CONCLUSION: Multiple vitamin E, C, B facial mask is efficacious for the treatment of acne and more than half study subjects experienced in none adverse reaction. Multiple vitamin E, C, B facial mask possesses an alternate therapy in acne vulgaris.