Tensile stimulation plays a crucial role in regulating tissue structure and function.Due to the limitations of in vivo studies,engineered tension tissues(ETTs)based on biomaterials and tissue engineering technologies have gradually become a research hotspot.Specifically,microscale-engineered tension tissues(μETTs)based on flexible microstructures overcome many limitations of traditional ETTs,due to their controllable mechanical constraints and precise mechanical characterization and stimulation capabilities.This has led to their widespread applications in disease research,drug screening,and toxicologic studies.This review summarizes the materials and fabrication method of flexible microstructures,analyzes their biomechanical roles in μETTs,provides an overview of research progress in myocardial,lung,and skeletal muscle μETTs,discusses mechanical modeling and analysis methods during the remodeling of μETTs,and looks ahead to the future development of this field.

Objective To propose a novel mechanical method and index to in-vivo characterize the health status of cancellous bone during the percutaneous kyphoplasty(PKP),and validate its feasibility and consistency.Methods According to the theory of elasticity,the expression and physical significance of the mechanical index K were given.Then using clinical images of the lumbar spine L4,three-dimensional finite element simulations were conducted to verify the validity of the theoretical results,as well as the consistency of the methodology and the indexes were verified for studies of different balloon shapes and puncture routes.Results The internal pressure of the balloon linearly varied with the injected fluid volume.The mechanical index K was closely related to the bone shear modulus and could well reflect the health status of cancellous bones.The balloon shape had a trivial influence on the Kresults,and the relative difference between the cylindrical and ellipsoidal shapes was less than 2％.The influence of surgical access route on the K results was also very small,and the relative difference between the routes by vertebral pedicle and by lateral margin of vertebral pedicle was less than 0.5％.Conclusions The in-vivo mechanical method and the mechanical index K can characterize the bone health of patients with good consistency.This study has a great significance for providing guidelines of the optimization of PKP operation plan and postoperative rehabilitation,collecting in vivo data of bone mechanical properties,and improving the diagnosis and treatment of osteoporosis in clinic.

Tensile stimulation plays a crucial role in regulating tissue structure and function.Due to the limitations of in vivo studies,engineered tension tissues(ETTs)based on biomaterials and tissue engineering technologies have gradually become a research hotspot.Specifically,microscale-engineered tension tissues(μETTs)based on flexible microstructures overcome many limitations of traditional ETTs,due to their controllable mechanical constraints and precise mechanical characterization and stimulation capabilities.This has led to their widespread applications in disease research,drug screening,and toxicologic studies.This review summarizes the materials and fabrication method of flexible microstructures,analyzes their biomechanical roles in μETTs,provides an overview of research progress in myocardial,lung,and skeletal muscle μETTs,discusses mechanical modeling and analysis methods during the remodeling of μETTs,and looks ahead to the future development of this field.

Objective To propose a novel mechanical method and index to in-vivo characterize the health status of cancellous bone during the percutaneous kyphoplasty(PKP),and validate its feasibility and consistency.Methods According to the theory of elasticity,the expression and physical significance of the mechanical index K were given.Then using clinical images of the lumbar spine L4,three-dimensional finite element simulations were conducted to verify the validity of the theoretical results,as well as the consistency of the methodology and the indexes were verified for studies of different balloon shapes and puncture routes.Results The internal pressure of the balloon linearly varied with the injected fluid volume.The mechanical index K was closely related to the bone shear modulus and could well reflect the health status of cancellous bones.The balloon shape had a trivial influence on the Kresults,and the relative difference between the cylindrical and ellipsoidal shapes was less than 2％.The influence of surgical access route on the K results was also very small,and the relative difference between the routes by vertebral pedicle and by lateral margin of vertebral pedicle was less than 0.5％.Conclusions The in-vivo mechanical method and the mechanical index K can characterize the bone health of patients with good consistency.This study has a great significance for providing guidelines of the optimization of PKP operation plan and postoperative rehabilitation,collecting in vivo data of bone mechanical properties,and improving the diagnosis and treatment of osteoporosis in clinic.

Background::Psychological stress has been reported to be a potential risk factor for hypertension among females, but it remains unclear whether spousal chronic stress levels alter the risk of hypertension among women. We examined the associations between stress within the family and hypertension among married women.Methods::Reproductive-aged women who were planning for pregnancy and their husbands were recruited from the National Free Pre-pregnancy Checkup Projects (NFPCP) across 31 provinces in China in 2016 and 2017. Perceived stress of wives or husbands was measured with a 5-point Likert-type scale, and assessed from three domains: work/life-related stress, economic stress, and overall stress. Multivariable-adjusted logistic regression models were used to assess the associations between stress status and the prevalence of hypertension.Results::Of 10,027,644 couples, 261,098 (2.60%) women had hypertension. The results showed that higher stress levels among themselves or their husbands were associated with a higher prevalence of hypertension in women ( Pfor trend <0.001). Compared with non-stressed participants, female participants with the highest stress themselves were at a greater risk of hypertension, with adjusted odds ratio (OR) of 1.31 (95% confidence interval [CI]: 1.25-1.37); and compared with participants whose husbands had no stress, those whose husbands had the highest stress level were at a higher risk of hypertension with adjusted OR of 1.24 (95% CI: 1.20-1.29). Moreover, compared with non-stressed status for both couples, only-wife-stressed, only-husband-stressed, and both-stressed couples were found to be significantly associated with increased risks of wives’ hypertension, with adjusted ORs of 1.28 (95% CI: 1.25-1.31), 1.19 (95% CI: 1.17-1.21), and 1.28 (95% CI: 1.26-1.31), respectively. Conclusion::Moderate to severe stress in both spouses might be associated with female hypertension prevalence, which highlights the importance of paying attention to the psychological stresses of couples within the family.

Under the "patient-centered" drug regulation concept,the inclusion of patient dimensions in real-world evidence becomes increasingly important. Patient experience data can complement and interpret existing data,generate evidence directly from patients,and achieve patient participation in drug development. Data types include patient-reported outcomes and free-text data,which can be collected autonomously or obtained from databases. Application scenarios involve new drug registration,safety evaluation,and additional indications. In China,applying patient experience data to real-world study mainly faces the following challenges:lack of conditions,standards,and motivation to collect high-quality data,a single type of data,and the difficulty of balancing data security with freedom,etc. It is recommended to issue special guidelines,establish a measurement tool certification process,expand data collection channels,explore data source integration methods,optimize the informed consent mechanism,and establish an evidence synergy mechanism to promote the practical application of the "patient-centered" concept in real-world study of drugs.

Population genomic approaches,which take advantages of high-throughput genotyping,are powerful yet costly methods to scan for selective sweeps.DNA-pooling strategies have been widely used for association studies because it is a cost-effective alternative to large-scale individual genotyping.Here,we performed an SNP-MaP(single nucleotide polymorphism microarrays and pooling)analysis using samples from Eurasia to evaluate the efficiency of pooling strategy in genome-wide scans for selection.By conducting simulations of allelotype data,we first demonstrated that the boxplot with average heterozygosity(HET)is a promising method to detect strong selective sweeps with a moderate level of pooling error.Based on this,we used a sliding window analysis of HET to detect the large contiguous regions(LCRs)putatively under selective sweeps from Eurasia datasets.This survey identified 63 LCRs in a European population.These signals were further supported by the integrated haplotype score(iHS)test using HapMap Ⅱ data.We also confirrned the European-specific signatures of positive selection from several previously identified genes(KEL,TRPV5,TRPV6,EPHB6).In summary,our results not only revealed the high credibility of SNP-MaP strategy in scanning for selective sweeps,but also provided an insight into the population differentiation.

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