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Zhang YF, Hu MW, Guo CC, Yang X, Wang YZ, Xiang S, Xu H. [Clinical efficacy of intraarticular vancomycin in preventing early periprosthetic joint infection after primary knee arthroplasty]. Zhonghua Wai Ke Za Zhi 2024; 62:591-597. [PMID: 38682631 DOI: 10.3760/cma.j.cn112139-20231116-00224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 05/01/2024]
Abstract
Objective: To investigate the clinical effect of intraarticular vancomycin on early periprosthetic joint infection (PJI) in knee arthroplasty and the incidence of postoperative complications. Methods: This is a retrospective cohort study. The clinical data of 1 867 patients who underwent primary knee arthroplasty at Department of Joint Surgery, the Affiliated Hospital of Qingdao University from April 2022 to June 2023 were retrospectively analysed, including total knee arthroplasty (TKA), robotic-assisted total knee arthroplasty (RA-TKA) and unicondylar knee arthroplasty (UKA). There were 687 males and 1180 females, aged (68.0±11.2)years(range:45 to 87 years). Patients were divided into the vancomycin group and the control group according to whether or not intra-articular injection of 1 g of vancomycin powder dissolved in 30 ml of saline was performed after intraoperative joint capsule closure. In the vancomycin group, 925 patients were included, including 782 TKA, 27 RA-TKA and 116 UKA.In the control group, 942 patients were included, including 767 TKA, 99 RA-TKA and 76 UKA. Early PJI, wound complications, and vancomycin-related toxicity including acute renal collapse, ototoxicity, and allergic reactions were assessed within 3 months postoperatively. Results: No PJI was found in all patients in the vancomycin group.Five cases (0.7%,5/767) of early PJI were found in TKA patients in the control group, with a statistically significant difference (P=0.030); 1 case of early PJI was found in each RA-TKA and UKA patients, with non-significant difference compared with vancomycin group (all P>0.05). Two cases (0.3%,2/782) of incisional complications were found in TKA patients in the vancomycin group, and 4 cases (0.5%, 4/767) of incisional complications were found in TKA patients in the control group, with non-significant difference(P=0.449); no incisional complications were found in RA-TKA patients in the vancomycin group, and 1 case (1.0%,1/99) of incisional complications were found in RA-TKA patients in the control group, the difference was not statistically significant (P>0.05); no incisional complications were found in both groups of UKA patients.No vancomycin-related acute kidney injury, ototoxicity, or allergic reactions was observed in all patients. Conclusion: Intra-articular injection of 1 g of vancomycin suspension after arthrotomy closure during TKA maybe lower the risk of early PJI without increasing the risk of wound complication and vancomycin-associated systemic toxicity.
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Affiliation(s)
- Y F Zhang
- Department of Joint Surgery, the Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - M W Hu
- Department of Joint Surgery, the Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - C C Guo
- Department of Sports Medicine, the Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - X Yang
- Department of Operation Room, the Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - Y Z Wang
- Department of Joint Surgery, the Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - S Xiang
- Department of Joint Surgery, the Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - H Xu
- Department of Joint Surgery, the Affiliated Hospital of Qingdao University, Qingdao 266000, China
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Xiang S, Li M, Xia Z, Fang C, Yang W, Deng W, Tan Z. Photocatalyst-free visible-light-promoted C(sp 2)-P coupling: efficient synthesis of aryl phosphonates. Org Biomol Chem 2024; 22:1794-1799. [PMID: 38348741 DOI: 10.1039/d3ob01987j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
A novel and efficient method for the synthesis of aryl phosphonates from aryl halides and trialkylphosphites via EDA complex-based photochemistry has been developed. It is demonstrated that aryl radicals, generated from the photoexcitation of the EDA complex formed by aryl halide and potassium thioacetate, could be intercepted with trialkylphosphite to produce the corresponding aryl phosphonates in moderate to good yields. It should be noted that the reaction is performed at room temperature in the absence of any transition metal catalyst, oxidant and photocatalyst, exhibiting high efficiency, high selectivity, and operational simplicity.
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Affiliation(s)
- Shiqi Xiang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Min Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Zhen Xia
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Chen Fang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Wen Yang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Wei Deng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Ze Tan
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
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Xiang S, Zheng LB, Zhu L, Gao Y, Wang DS, Liu SL, Zhang S, Wang TY, Lu Y. [Radiomics-based prediction of microsatellite instability in stage Ⅱ and Ⅲ rectal cancer patients based on T2WI MRI and diffusion-weighted imaging]. Zhonghua Wai Ke Za Zhi 2023; 61:782-787. [PMID: 37491171 DOI: 10.3760/cma.j.cn112139-20230315-00106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Objective: To examine the radiomics model based on high-resolution T2WI and diffusion weighted imaging (DWI) in predicting microsatellite stability in patients with stage Ⅱ and Ⅲ rectal cancer. Methods: From February 2016 to October 2020, 175 patients with stage Ⅱ and Ⅲ rectal cancer who met the inclusion criteria were retrospectively collected. There were 119 males and 56 females, aged (63.9±9.4) years (range: 37 to 85 years), including 152 patients with microsatellite stability and 23 patients with microsatellite instability. All patients were randomly divided into the training group (n=123) and the validation group (n=52) with a ratio of 7∶3. The region of interest was labeled on the T2WI and DWI images of each patient using the ITK-SNAP software, and PyRadiomics was used to extract seven kinds of radiomics features. After removing redundant features and normalizing features, the least absolute shrinkage and selection operation were used for feature selection. One clinical model, three radiomics models and one clinical-radiomics model were constructed in the training group based on a support vector machine. The area under receiver operating characteristic curve (AUC), sensitivity, specificity, and accuracy were used to evaluate the performance of the models in the verification group. Results: Three clinical features (age, degree of tumor differentiation, and distance from the lower edge of the tumor to the anal edge) and six radiomics features (two DWI-related features and four T2WI-related features) most related to microsatellite status of rectal cancer patients were selected. The AUC of the clinical-radiomics model in the training group was 0.95. In the validation group, the AUC was 0.81, better than the clinical model (0.68, Z=0.71, P=0.04), and equivalent to the T2WI+DWI model (0.82, Z=0.21, P=0.83). Conclusions: Radiomic features based on preoperative T2WI and DWI were related to microsatellite stability in patients with stage Ⅱ and Ⅲ rectal cancer and showed a high classification efficiency. The model based on the features provided a noninvasive and convenient tool for preoperative determination of microsatellite stability in rectal cancer patients.
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Affiliation(s)
- S Xiang
- Department of Gastrointestinal Surgery, Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - L B Zheng
- Department of Gastrointestinal Surgery, Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - L Zhu
- Shandong Provincial Key Laboratory of Digital Medicine and Computer-Assisted Surgery, Qingdao 266000, China
| | - Y Gao
- Department of Gastrointestinal Surgery, Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - D S Wang
- Department of Gastrointestinal Surgery, Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - S L Liu
- Department of Gastrointestinal Surgery, Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - S Zhang
- Department of Radiology, Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - T Y Wang
- Department of Radiology, Affiliated Hospital of Qingdao University, Qingdao 266000, China
| | - Y Lu
- Department of Gastrointestinal Surgery, Affiliated Hospital of Qingdao University, Qingdao 266000, China
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Zhang X, Xiang S, Zhang Y, Liu S, Lei G, Hines S, Wang N, Lin H. In vitro study to identify ligand-independent function of estrogen receptor-α in suppressing DNA damage-induced chondrocyte senescence. FASEB J 2023; 37:e22746. [PMID: 36622202 PMCID: PMC10369926 DOI: 10.1096/fj.202201228r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 11/29/2022] [Accepted: 12/19/2022] [Indexed: 01/10/2023]
Abstract
In osteoarthritis (OA), chondrocytes undergo many pathological alternations that are linked with cellular senescence. However, the exact pathways that lead to the generation of a senescence-like phenotype in OA chondrocytes are not clear. Previously, we found that loss of estrogen receptor-α (ERα) was associated with an increased senescence level in human chondrocytes. Since DNA damage is a common cause of cellular senescence, we aimed to study the relationship among ERα levels, DNA damage, and senescence in chondrocytes. We first examined the levels of ERα, representative markers of DNA damage and senescence in normal and OA cartilage harvested from male and female human donors, as well as from male mice. The influence of DNA damage on ERα levels was studied by treating human chondrocytes with doxorubicin (DOX), which is an often-used DNA-damaging agent. Next, we tested the potential of overexpressing ERα in reducing DNA damage and senescence levels. Lastly, we explored the interaction between ERα and nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) pathway. Results indicated that the OA chondrocytes contained DNA damage and displayed senescence features, which were accompanied by significantly reduced ERα levels. Overexpression of ERα reduced the levels of DNA damage and senescence in DOX-treated normal chondrocytes and OA chondrocytes. Moreover, DOX-induced the activation of NF-κB pathway, which was partially reversed by overexpressing ERα. Taken together, our results demonstrated the critical role of ERα in maintaining the health of chondrocytes by inhibiting DNA damage and senescence. This study also suggests that maintaining the ERα level may represent a new avenue to prevent and treat OA.
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Affiliation(s)
- Xiurui Zhang
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Shiqi Xiang
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Yiqian Zhang
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Silvia Liu
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Guanghua Lei
- Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Sophie Hines
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Ning Wang
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Hang Lin
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, Pittsburgh, Pennsylvania, USA.,McGowan Institute for Regenerative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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Cao G, Li L, Xiang S, Lin H, Pei F, Tuan RSC, Alexander PG. The development of a mouse model to investigate the formation of heterotopic ossification. J Orthop Surg (Hong Kong) 2023; 31:10225536231163466. [PMID: 36943428 DOI: 10.1177/10225536231163466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/23/2023] Open
Abstract
BACKGROUND Muscle injury and concomitant bone injury are important drivers to induce heterotopic ossification (HO). However, the related roles of muscle and concomitant bone injury in HO formation are still unclear. This study aims to develop a mouse model through the combination of hindlimb amputation (Am) and cardiotoxin (CTX) injection to investigate the mechanism of HO formation. METHOD The mice were randomly divided into Am group (Am of right hindlimb, n = 12), CTX group (CTX injection in the calf muscle of left hindlimb, n = 12) and Am + CTX group (the combination of Am of right hindlimb and CTX injection of left hindlimb, n = 18). MicroCT was used to evaluate the incidence of HO. Histology was used to investigate the progression of HO. RESULTS The MicroCT showed that only Am or CTX injection failed to induce HO while the combination of Am and CTX injection successfully induced HO. The incidence of HO was significant in Am + CTX group on day 7 (0% vs 0% vs 83.3%, p = 0.001) and day 14 (0% vs 0% vs 83.3%, p = 0.048). HO was located on the left hindlimb where CTX was injected. Moreover, the bone volume and bone density on day 14 were higher than those on day 7 in Am + CTX group. Histology revealed the evidence of calcification and expression of osteogenic markers in calcification sites in Am + CTX group. CONCLUSION In summary, the combination of Am and CTX injection could successfully induce dystrophic calcification/HO, which occurs in the location of muscle injury.
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Affiliation(s)
- Guorui Cao
- Department of Knee Surgery, 523047Luoyang Orthopedic Hospital of Henan Province, Orthopedic Hospital of Henan Province, Luoyang, China
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, 12317University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - La Li
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, 12317University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Shiqi Xiang
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, 12317University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Hang Lin
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, 12317University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Fuxing Pei
- Department of Orthopaedic Surgery, 34753West China Hospital, Sichuan University, Chengdu, China
| | - Rocky Sung Chi Tuan
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, 12317University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong, Shatin, China
| | - Peter G Alexander
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, 12317University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
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Xiang S, Li Y, Li Y, Zhang J, Pan W, Lu Y, Liu S. Increased Dietary Niacin Intake Improves Muscle Strength, Quality, and Glucose Homeostasis in Adults over 40 Years of Age. J Nutr Health Aging 2023; 27:709-718. [PMID: 37754210 DOI: 10.1007/s12603-023-1967-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 07/17/2023] [Indexed: 09/28/2023]
Abstract
BACKGROUND AND AIMS Age-related loss of skeletal muscle mass and strength begins at 40 years of age, and limited evidence suggests that niacin supplementation increases levels of nicotinamide adenine dinucleotide in mouse muscle tissue. In addition, skeletal muscle has a key role in the body's processing of glucose. Therefore, this study aimed to investigate the relationship between dietary niacin and skeletal muscle mass, strength, and glucose homeostasis in people aged 40 years and older. METHODS This study was an American population-based cross-sectional analysis using data from the National Health and Nutrition Examination Survey (NHANES). Considering that some outcomes are only measured in specific survey cycles and subsamples, we established three data sets: a grip strength dataset (2011-2014, n=3772), a body mass components dataset (2011-2018, n=3279), and a glucose homeostasis dataset (1999-2018, n=9189). Dietary niacin and covariates were measured in all survey cycles. Linear regression or logistic regression models that adjusted for several main covariates, such as physical activity and diet, was used to evaluate the relationship between dietary niacin and grip strength, total lean mass, appendicular lean mass, total fat, trunk fat, total bone mineral content, homeostasis model assessment of insulin resistance (HOMA-IR), fasting blood glycose, fasting insulin and sarcopenia risk. Subgroup analyses, a trend test, an interaction test, and a restricted cubic spline were used for further exploration. RESULTS Higher dietary niacin intake was significantly correlated with higher grip strength (β 0.275, 95% confidence intervals [CI] 0.192-0.357), higher total lean mass (β 0.060, 95% CI 0.045-0.074), higher appendicular lean mass (β 0.025, 95% CI 0.018-0.033), and higher total bone mineral content (β 0.005, 95% CI 0.004-0.007). By contrast, higher dietary niacin intake was significantly associated with lower total fat (β -0.061, 95% CI -0.076 to -0.046), lower trunk fat (β -0.041, 95% CI -0.050 to -0.032) and lower sarcopenia risk (OR 0.460, 95% CI 0.233 to 0.907). In addition, dietary niacin significantly reduced HOMA-IR, fasting blood glucose (in participants without diabetes), and fasting insulin (p <0.05). CONCLUSION Niacin is associated with improved body composition (characterized by increased muscle mass and decreased fat content) and improved glucose homeostasis in dietary doses. Dietary niacin supplementation is a feasible way to alleviate age-related muscular loss.
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Affiliation(s)
- S Xiang
- Yun Lu, MD, PhD, Department of Gastrointestinal Surgery, Affiliated Hospital of Qingdao University, Qingdao, China, , 0000-0003-2253-2983; Shang-Long Liu, MD, PhD, Department of Gastrointestinal Surgery, Affiliated Hospital of Qingdao University, Qingdao, China, , 0000-0002-5828-4718
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Wang J, Li YJ, Li XX, Sun YX, Xiang S, Zhang MQ, Li XJ, Qiu ZK. Late-Night Overeating and All-Cause and Cardiovascular Disease Mortality in Adults Aged ≥ 50: A Cohort Study. J Nutr Health Aging 2023; 27:701-708. [PMID: 37754209 DOI: 10.1007/s12603-023-1966-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 07/17/2023] [Indexed: 09/28/2023]
Abstract
BACKGROUND Late-night overeating (LNOE) is closely associated with many health risk factors, but whether LNOE can increase the risk of death remains unknown. Thus, the prospective cohort study aimed to investigate the relationship between LNOE and mortality using data from the National Health and Nutrition Examination Survey. METHODS 11,893 participants aged 50 years and older were included in the study. Dietary information was obtained through 24-h dietary recall interviews. Cox regression, subgroup, sensitivity, and restricted cubic spline analyses were used to assess the association between LNOE and mortality. RESULTS During a median follow-up of 8.3 years, 2,498 deaths occurred. After adjusting for major confounders, compared to the non-late-night eating (NLNE) group, the LNOE group was associated with higher risks of all-cause (HR = 1.47, 95% CI = 1.06-2.04) and cardiovascular disease (CVD) mortality (HR = 2.02, 95% CI = 1.13-3.60). No significant association was found between late-night eating (LNE) and mortality. Subgroup analyses showed that the LNOE group had a greater risk of all-cause and CVD mortality in participants older than 70 years, with alcohol consumption and hypertension and demonstrated an increased risk of all-cause mortality in males and higher CVD mortality in females. CONCLUSION The habit of LNOE was an independent risk factor for all-cause and CVD mortality in US adults aged 50 years and older, which was also influenced by age, sex, alcohol consumption, and hypertension.
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Affiliation(s)
- J Wang
- Zhen-kang Qiu, PhD, MD, Interventional Medical Center, The Affiliated Hospital of Qingdao University, 16, Jiangsu Road, Qingdao 266003, Shandong Province, China, Tel: 86-0532-82913275, Fax: 86-0532-82913275,
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Xiang S, Lin Z, Makarcyzk MJ, Riewruja K, Zhang Y, Zhang X, Li Z, Clark KL, Li E, Liu S, Hao T, Fritch MR, Alexander PG, Lin H. Differences in the intrinsic chondrogenic potential of human mesenchymal stromal cells and iPSC-derived multipotent cells. Clin Transl Med 2022; 12:e1112. [PMID: 36536500 PMCID: PMC9763539 DOI: 10.1002/ctm2.1112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Revised: 10/26/2022] [Accepted: 10/30/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Human multipotent progenitor cells (hiMPCs) created from induced pluripotent stem cells (iPSCs) represent a new cell source for cartilage regeneration. In most studies, bone morphogenetic proteins (BMPs) are needed to enhance transforming growth factor-β (TGFβ)-induced hiMPC chondrogenesis. In contrast, TGFβ alone is sufficient to result in robust chondrogenesis of human primary mesenchymal stromal cells (hMSCs). Currently, the mechanism underlying this difference between hiMPCs and hMSCs has not been fully understood. METHODS In this study, we first tested different growth factors alone or in combination in stimulating hiMPC chondrogenesis, with a special focus on chondrocytic hypertrophy. The reparative capacity of hiMPCs-derived cartilage was assessed in an osteochondral defect model created in rats. hMSCs isolated from bone marrow were included in all studies as the control. Lastly, a mechanistic study was conducted to understand why hiMPCs and hMSCs behave differently in responding to TGFβ. RESULTS Chondrogenic medium supplemented with TGFβ3 and BMP6 led to robust in vitro cartilage formation from hiMPCs with minimal hypertrophy. Cartilage tissue generated from this new method was resistant to osteogenic transition upon subcutaneous implantation and resulted in a hyaline cartilage-like regeneration in osteochondral defects in rats. Interestingly, TGFβ3 induced phosphorylation of both Smad2/3 and Smad1/5 in hMSCs, but only activated Smad2/3 in hiMPCs. Supplementing BMP6 activated Smad1/5 and significantly enhanced TGFβ's compacity in inducing hiMPC chondrogenesis. The chondro-promoting function of BMP6 was abolished by the treatment of a BMP pathway inhibitor. CONCLUSIONS This study describes a robust method to generate chondrocytes from hiMPCs with low hypertrophy for hyaline cartilage repair, as well as elucidates the difference between hMSCs and hiMPCs in response to TGFβ. Our results also indicated the importance of activating both Smad2/3 and Smad1/5 in the initiation of chondrogenesis.
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Affiliation(s)
- Shiqi Xiang
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
- Department of OrthopaedicsThe Second Xiangya HospitalCentral South UniversityChangshaHunanPR China
| | - Zixuan Lin
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Meagan J. Makarcyzk
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
- Department of BioengineeringUniversity of Pittsburgh Swanson School of EngineeringPittsburghPennsylvaniaUSA
| | - Kanyakorn Riewruja
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
- Osteoarthritis and Musculoskeleton Research Unit, Faculty of MedicineChulalongkorn University, King Chulalongkorn Memorial Hospital, Thai Red Cross SocietyBangkokThailand
| | - Yiqian Zhang
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Xiurui Zhang
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Zhong Li
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Karen L. Clark
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Eileen Li
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Silvia Liu
- Department of PathologyUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Tingjun Hao
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Madalyn R. Fritch
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Peter G. Alexander
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
- McGowan Institute for Regenerative MedicineUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Hang Lin
- Department of Orthopaedic SurgeryUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
- Department of BioengineeringUniversity of Pittsburgh Swanson School of EngineeringPittsburghPennsylvaniaUSA
- McGowan Institute for Regenerative MedicineUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
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Pan X, Xiang S, Zhu Y, Yang M. Co-cultivation with Endophytic Fungi Differentially Shaped the Anthocyanin Profiles in Post-veraison Grape Berries. APPL BIOCHEM MICRO+ 2022. [DOI: 10.1134/s0003683822060138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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Adeeb N, Dibas M, Griessenauer CJ, Cuellar HH, Salem MM, Xiang S, Enriquez-Marulanda A, Hong T, Zhang H, Taussky P, Grandhi R, Waqas M, Aldine AS, Tutino VM, Aslan A, Siddiqui AH, Levy EI, Ogilvy CS, Thomas AJ, Ulfert C, Möhlenbruch MA, Renieri L, Bengzon Diestro JD, Lanzino G, Brinjikji W, Spears J, Vranic JE, Regenhardt RW, Rabinov JD, Harker P, Müller-Thies-Broussalis E, Killer-Oberpfalzer M, Islak C, Kocer N, Sonnberger M, Engelhorn T, Kapadia A, Yang VXD, Salehani A, Harrigan MR, Krings T, Matouk CC, Mirshahi S, Chen KS, Aziz-Sultan MA, Ghorbani M, Schirmer CM, Goren O, Dalal SS, Finkenzeller T, Holtmannspötter M, Buhk JH, Foreman PM, Cress MC, Hirschl RA, Reith W, Simgen A, Janssen H, Marotta TR, Stapleton CJ, Patel AB, Dmytriw AA. Learning Curve for Flow Diversion of Posterior Circulation Aneurysms: A Long-Term International Multicenter Cohort Study. AJNR Am J Neuroradiol 2022; 43:1615-1620. [PMID: 36229166 PMCID: PMC9731249 DOI: 10.3174/ajnr.a7679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 06/28/2022] [Indexed: 02/01/2023]
Abstract
BACKGROUND AND PURPOSE Flow diversion has gradually become a standard treatment for intracranial aneurysms of the anterior circulation. Recently, the off-label use of the flow diverters to treat posterior circulation aneurysms has also increased despite initial concerns of rupture and the suboptimal results. This study aimed to explore the change in complication rates and treatment outcomes across time for posterior circulation aneurysms treated using flow diversion and to further evaluate the mechanisms and variables that could potentially explain the change and outcomes. MATERIALS AND METHODS A retrospective review using a standardized data set at multiple international academic institutions was performed to identify patients with ruptured and unruptured posterior circulation aneurysms treated with flow diversion during a decade spanning January 2011 to January 2020. This period was then categorized into 4 intervals. RESULTS A total of 378 procedures were performed during the study period. Across time, there was an increasing tendency to treat more vertebral artery and fewer large vertebrobasilar aneurysms (P = .05). Moreover, interventionalists have been increasingly using fewer overlapping flow diverters per aneurysm (P = .07). There was a trend toward a decrease in the rate of thromboembolic complications from 15.8% in 2011-13 to 8.9% in 2018-19 (P = .34). CONCLUSIONS This multicenter experience revealed a trend toward treating fewer basilar aneurysms, smaller aneurysms, and increased usage of a single flow diverter, leading to a decrease in the rate of thromboembolic and hemorrhagic complications.
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Affiliation(s)
- N Adeeb
- From the Departments of Neurosurgery and Interventional Neuroradiology (N.A., M.D., H.H.C., A.S.A., A.A.), Louisiana State University Hospital, Shreveport, Louisiana
| | - M Dibas
- From the Departments of Neurosurgery and Interventional Neuroradiology (N.A., M.D., H.H.C., A.S.A., A.A.), Louisiana State University Hospital, Shreveport, Louisiana
| | - C J Griessenauer
- Departments of Neurosurgery and Radiology (C.J.G., C.M.S., O.G., S.S.D.), Geisinger, Danville, Pennsylvania
- Department of Neurology/Institut of Neurointervention (C.J.G., E.M.-T.-B., M.K.-O.), University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria
| | - H H Cuellar
- From the Departments of Neurosurgery and Interventional Neuroradiology (N.A., M.D., H.H.C., A.S.A., A.A.), Louisiana State University Hospital, Shreveport, Louisiana
| | - M M Salem
- Neurosurgical Service (M.M.S., A.E.-M., P.T., C.S.O.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - S Xiang
- Department of Neurosurgery (S.X., H.Z., T.H.), Xuanwu Hospital, Capital Medical University, Beijing, China
| | - A Enriquez-Marulanda
- Neurosurgical Service (M.M.S., A.E.-M., P.T., C.S.O.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - T Hong
- Department of Neurosurgery (S.X., H.Z., T.H.), Xuanwu Hospital, Capital Medical University, Beijing, China
| | - H Zhang
- Department of Neurosurgery (S.X., H.Z., T.H.), Xuanwu Hospital, Capital Medical University, Beijing, China
| | - P Taussky
- Neurosurgical Service (M.M.S., A.E.-M., P.T., C.S.O.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
- Department of Neurosurgery (P.T., R.G.), University of Utah, Salt Lake City, Utah
| | - R Grandhi
- Department of Neurosurgery (P.T., R.G.), University of Utah, Salt Lake City, Utah
| | - M Waqas
- Department of Neurosurgery (M.W., V.M.T., A.H.S., E.I.L.), State University of New York at Buffalo, Buffalo, New York
| | - A S Aldine
- From the Departments of Neurosurgery and Interventional Neuroradiology (N.A., M.D., H.H.C., A.S.A., A.A.), Louisiana State University Hospital, Shreveport, Louisiana
| | - V M Tutino
- Department of Neurosurgery (M.W., V.M.T., A.H.S., E.I.L.), State University of New York at Buffalo, Buffalo, New York
| | - A Aslan
- From the Departments of Neurosurgery and Interventional Neuroradiology (N.A., M.D., H.H.C., A.S.A., A.A.), Louisiana State University Hospital, Shreveport, Louisiana
| | - A H Siddiqui
- Department of Neurosurgery (M.W., V.M.T., A.H.S., E.I.L.), State University of New York at Buffalo, Buffalo, New York
| | - E I Levy
- Department of Neurosurgery (M.W., V.M.T., A.H.S., E.I.L.), State University of New York at Buffalo, Buffalo, New York
| | - C S Ogilvy
- Neurosurgical Service (M.M.S., A.E.-M., P.T., C.S.O.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - A J Thomas
- Department of Neurological Surgery (A.J.T.), Cooper University Health Care, Cooper Medical School of Rowan University, Camden, New Jersey
| | - C Ulfert
- Department of Neuroradiology (C.U., M.A.M.), Universitätsklinikum Heidelberg, Heidelberg, Germany
| | - M A Möhlenbruch
- Department of Neuroradiology (C.U., M.A.M.), Universitätsklinikum Heidelberg, Heidelberg, Germany
| | - L Renieri
- Department of Interventional Neuroradiology (L.R.), University of Florence, Florence, Italy
| | - J D Bengzon Diestro
- Division of Diagnostic and Therapeutic Neuroradiology (J.D.B.D., J.S., T.R.M.), St. Michael's Hospital, Toronto, Ontario, Canada
| | - G Lanzino
- Department of Neurological Surgery (G.L., W.B.), Mayo Clinic, Rochester, Minnesota
| | - W Brinjikji
- Department of Neurological Surgery (G.L., W.B.), Mayo Clinic, Rochester, Minnesota
| | - J Spears
- Division of Diagnostic and Therapeutic Neuroradiology (J.D.B.D., J.S., T.R.M.), St. Michael's Hospital, Toronto, Ontario, Canada
| | - J E Vranic
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - R W Regenhardt
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - J D Rabinov
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - P Harker
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - E Müller-Thies-Broussalis
- Department of Neurology/Institut of Neurointervention (C.J.G., E.M.-T.-B., M.K.-O.), University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria
| | - M Killer-Oberpfalzer
- Department of Neurology/Institut of Neurointervention (C.J.G., E.M.-T.-B., M.K.-O.), University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria
| | - C Islak
- Department of Neuroradiology (C.I., N.K.), Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
| | - N Kocer
- Department of Neuroradiology (C.I., N.K.), Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
| | - M Sonnberger
- Department of Neuroradiology (M.S.), Kepler Universitätsklinikum Linz, Linz, Austria
| | - T Engelhorn
- Department of Neuroradiology (T.E.), University Hospital Erlangen, Erlangen, Germany
| | - A Kapadia
- Departments of Medical Imaging and Neurosurgery (A.K.), Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
| | - V X D Yang
- Neurointerventional Program (V.X.D.Y., A.A.D.), Departments of Medical Imaging & Clinical Neurological Sciences, London Health Sciences Centre, Western University, Ontario, Canada
| | - A Salehani
- Department of Neurosurgery (A. Salehani, M.R.H.), University of Alabama at Birmingham, Birmingham, Alabama
| | - M R Harrigan
- Department of Neurosurgery (A. Salehani, M.R.H.), University of Alabama at Birmingham, Birmingham, Alabama
| | - T Krings
- Division of Interventional Neuroradiology (T.K.), Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada
| | - C C Matouk
- Department of Neurosurgery (C.C.M.), Yale School of Medicine, New Haven, Connecticut
| | - S Mirshahi
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - K S Chen
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - M A Aziz-Sultan
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - M Ghorbani
- Division of Vascular and Endovascular Neurosurgery (M.G.), Firoozgar Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - C M Schirmer
- Departments of Neurosurgery and Radiology (C.J.G., C.M.S., O.G., S.S.D.), Geisinger, Danville, Pennsylvania
| | - O Goren
- Departments of Neurosurgery and Radiology (C.J.G., C.M.S., O.G., S.S.D.), Geisinger, Danville, Pennsylvania
| | - S S Dalal
- Departments of Neurosurgery and Radiology (C.J.G., C.M.S., O.G., S.S.D.), Geisinger, Danville, Pennsylvania
| | - T Finkenzeller
- Institute of Radiology and Neuroradiology (T.F., M.H.), Klinikum Nuernberg Sued, Paracelsus Medical University Nuernberg, Nuernberg, Germany
| | - M Holtmannspötter
- Institute of Radiology and Neuroradiology (T.F., M.H.), Klinikum Nuernberg Sued, Paracelsus Medical University Nuernberg, Nuernberg, Germany
- Department of Neuroradiology (M.H.), Klinikum Weiden, Weiden, Germany
| | - J-H Buhk
- Department of Neuroradiology (J.-H.B.), University Hospital Hamburg Eppendorf, Hamburg, Germany
| | - P M Foreman
- Neuroscience and Rehabilitation Institute (P.M.F., M.C.C., R.A.H.), Orlando Health, Orlando, Florida
| | - M C Cress
- Neuroscience and Rehabilitation Institute (P.M.F., M.C.C., R.A.H.), Orlando Health, Orlando, Florida
| | - R A Hirschl
- Neuroscience and Rehabilitation Institute (P.M.F., M.C.C., R.A.H.), Orlando Health, Orlando, Florida
| | - W Reith
- Clinic for Diagnostic and Interventional Neuroradiology (W.R., A. Simgen), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - A Simgen
- Clinic for Diagnostic and Interventional Neuroradiology (W.R., A. Simgen), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - H Janssen
- Institute for Neuroradiology (H.J.), Klinikum Ingolstadt, Ingolstadt, Germany
| | - T R Marotta
- Division of Diagnostic and Therapeutic Neuroradiology (J.D.B.D., J.S., T.R.M.), St. Michael's Hospital, Toronto, Ontario, Canada
| | - C J Stapleton
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - A B Patel
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - A A Dmytriw
- Neurointerventional Program (V.X.D.Y., A.A.D.), Departments of Medical Imaging & Clinical Neurological Sciences, London Health Sciences Centre, Western University, Ontario, Canada
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
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Wang T, You F, Li Y, Xiang S, Wu H, Meng H, Yang N, Zhang B, Yang L. 759P Preconditioning with irradiation enhances efficacy of B7-H3-CAR-T in treating solid tumor models. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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12
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Cao G, Xiang S, Yang M, Quan S, Yao J, Cai L, Feng W, Yang X, Xu H, Huang Z, Zhang S, Yue C, Tan H, Pei F. Risk factors of opioid use associated with an enhanced-recovery programme after total knee arthroplasty. BMC Musculoskelet Disord 2021; 22:1046. [PMID: 34930202 PMCID: PMC8690997 DOI: 10.1186/s12891-021-04937-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 12/03/2021] [Indexed: 02/08/2023] Open
Abstract
Background Characterizing the impacts of postoperative opioid use on total knee arthroplasty (TKA) patients may help optimize the pain management after TKA. The aim of the study is to examine the prevalence and risk factors for opioid use with an enhanced-recovery programme after primary TKA. Methods We identified 361 patients undergoing TKA, and separated those on the basis of whether to receive opioid use after surgery. Themultivariate logistic regression model was used to identify independent risk factors for opioid use after primary TKA. Length of stay (LOS) and postoperative complications were also recorded and compared. Results The prevalence of opioid use after primary TKA was 23.0%. The significant risk factor was the longer operative time (OR [odds ratio] = 1.017, 95% CI [confidence interval] = 1.001 to 1.032, p = 0.034) and the protective factor was the utilization of tranexamic acid(OR= 0.355, 95% CI = 0.161 to 0.780, p = 0.010). In addition, the LOS was longer in opioid group (p < 0.05). Conclusion Considering the adverse health effects of opioid use, strategies need to be developed to prevent persistent opioid use after TKA. Reducing operative time and the application of tranexamic acid could lower the risk of opioid use with an enhanced-recovery programme after primary TKA.
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Affiliation(s)
- Guorui Cao
- Department of Knee Injury, Luoyang Orthopedic Hospital of Henan Province, Orthopedic Hospital of Henan Province, Luoyang, Henan Province, People's Republic of China
| | - Shiqi Xiang
- Department of Orthopedics, The Second Xiangya Hospital of Central South University, Changsha, Hunan Province, People's Republic of China
| | - Minglu Yang
- Department of Knee Injury, Luoyang Orthopedic Hospital of Henan Province, Orthopedic Hospital of Henan Province, Luoyang, Henan Province, People's Republic of China
| | - Songtao Quan
- Department of Knee Injury, Luoyang Orthopedic Hospital of Henan Province, Orthopedic Hospital of Henan Province, Luoyang, Henan Province, People's Republic of China
| | - Junna Yao
- Department of Knee Injury, Luoyang Orthopedic Hospital of Henan Province, Orthopedic Hospital of Henan Province, Luoyang, Henan Province, People's Republic of China
| | - Litao Cai
- Department of Knee Injury, Luoyang Orthopedic Hospital of Henan Province, Orthopedic Hospital of Henan Province, Luoyang, Henan Province, People's Republic of China
| | - Wei Feng
- Department of Knee Injury, Luoyang Orthopedic Hospital of Henan Province, Orthopedic Hospital of Henan Province, Luoyang, Henan Province, People's Republic of China
| | - Xiuli Yang
- Department of Orthopaedic surgery, West China Hospital, Sichuan University, 37# Guoxue Road, Chengdu, Sichuan Province, 610041, People's Republic of China
| | - Hong Xu
- Department of Orthopaedic surgery, West China Hospital, Sichuan University, 37# Guoxue Road, Chengdu, Sichuan Province, 610041, People's Republic of China
| | - Zeyu Huang
- Department of Orthopaedic surgery, West China Hospital, Sichuan University, 37# Guoxue Road, Chengdu, Sichuan Province, 610041, People's Republic of China
| | - Shaoyun Zhang
- Department of Orthopedics, The Third Hospital of Mianyang, Sichuan Mental Health Center, Mianyang, Sichuan Province, People's Republic of China
| | - Chen Yue
- Department of Knee Injury, Luoyang Orthopedic Hospital of Henan Province, Orthopedic Hospital of Henan Province, Luoyang, Henan Province, People's Republic of China
| | - Honglue Tan
- Department of Knee Injury, Luoyang Orthopedic Hospital of Henan Province, Orthopedic Hospital of Henan Province, Luoyang, Henan Province, People's Republic of China
| | - Fuxing Pei
- Department of Orthopaedic surgery, West China Hospital, Sichuan University, 37# Guoxue Road, Chengdu, Sichuan Province, 610041, People's Republic of China.
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Gao Q, Li Z, Rhee C, Xiang S, Maruyama M, Huang EE, Yao Z, Bunnell BA, Tuan RS, Lin H, Gold MS, Goodman SB. Macrophages Modulate the Function of MSC- and iPSC-Derived Fibroblasts in the Presence of Polyethylene Particles. Int J Mol Sci 2021; 22:12837. [PMID: 34884641 PMCID: PMC8657553 DOI: 10.3390/ijms222312837] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 11/21/2021] [Accepted: 11/24/2021] [Indexed: 01/15/2023] Open
Abstract
Fibroblasts in the synovial membrane secrete molecules essential to forming the extracellular matrix (ECM) and supporting joint homeostasis. While evidence suggests that fibroblasts contribute to the response to joint injury, the outcomes appear to be patient-specific and dependent on interactions between resident immune cells, particularly macrophages (Mφs). On the other hand, the response of Mφs to injury depends on their functional phenotype. The goal of these studies was to further explore these issues in an in vitro 3D microtissue model that simulates a pathophysiological disease-specific microenvironment. Two sources of fibroblasts were used to assess patient-specific influences: mesenchymal stem cell (MSC)- and induced pluripotent stem cell (iPSC)-derived fibroblasts. These were co-cultured with either M1 or M2 Mφs, and the cultures were challenged with polyethylene particles coated with lipopolysaccharide (cPE) to model wear debris generated from total joint arthroplasties. Our results indicated that the fibroblast response to cPE was dependent on the source of the fibroblasts and the presence of M1 or M2 Mφs: the fibroblast response as measured by gene expression changes was amplified by the presence of M2 Mφs. These results demonstrate that the immune system modulates the function of fibroblasts; furthermore, different sources of differentiated fibroblasts may lead to divergent results. Overall, our research suggests that M2 Mφs may be a critical target for the clinical treatment of cPE induced fibrosis.
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Affiliation(s)
- Qi Gao
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, CA 94304, USA; (Q.G.); (C.R.); (M.M.); (E.E.H.); (Z.Y.)
| | - Zhong Li
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA; (Z.L.); (S.X.); (R.S.T.); (H.L.)
| | - Claire Rhee
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, CA 94304, USA; (Q.G.); (C.R.); (M.M.); (E.E.H.); (Z.Y.)
| | - Shiqi Xiang
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA; (Z.L.); (S.X.); (R.S.T.); (H.L.)
| | - Masahiro Maruyama
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, CA 94304, USA; (Q.G.); (C.R.); (M.M.); (E.E.H.); (Z.Y.)
| | - Elijah Ejun Huang
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, CA 94304, USA; (Q.G.); (C.R.); (M.M.); (E.E.H.); (Z.Y.)
| | - Zhenyu Yao
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, CA 94304, USA; (Q.G.); (C.R.); (M.M.); (E.E.H.); (Z.Y.)
| | - Bruce A. Bunnell
- Department of Microbiology, Immunology and Genetics, University of North Texas Health Science Center, Fort Worth, TX 76107, USA;
| | - Rocky S. Tuan
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA; (Z.L.); (S.X.); (R.S.T.); (H.L.)
- Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Hang Lin
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA; (Z.L.); (S.X.); (R.S.T.); (H.L.)
| | - Michael S. Gold
- Department of Neurobiology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA;
| | - Stuart B. Goodman
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, CA 94304, USA; (Q.G.); (C.R.); (M.M.); (E.E.H.); (Z.Y.)
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Shang GQ, Xiang S, Guo CC, Guo JJ, Zhang HN, Wang YZ, Xu H. [Diagnostic value of platelet associated biomarkers in chronic periprosthetic joint infection]. Zhonghua Wai Ke Za Zhi 2021; 59:767-772. [PMID: 34404175 DOI: 10.3760/cma.j.cn112139-20210401-00152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To evaluate the diagnostic value of platelet count(PC),PC to mean platelet volume(MPV) ratio(PC/MPV) and plateletcrit(PCT) in chronic periprosthetic joint infection(PJI). Method: The medical records of 159 patients who underwent hip or knee revisions at Department of Joint Surgery,Affiliated Hospital of Qingdao University from August 2013 to June 2019 were retrospectively reviewed. There were 51 patients(26 knees and 25 hips) in the PJI group,which included 28 males and 23 females,aged (68.0±11.8)years (range:32 to 84 years)with a body mass index(BMI)of (26.1±3.6) kg/m².There were 116 patients(19 knees and 97 hips) in the aseptic loosening(AL) group,including 67 males and 49 females,aged (70.3±8.9)years(range:49 to 89 years)with a BMI of (25.0±3.6)kg/m².The plasma C-reactive protein(CRP),erythrocyte sedimentation rate(ESR),PC,MPV,PC/MPV and PCT levels of the two groups were recorded and analyzed. Receiver operating characteristic curve was used to calculate the sensitivity and specificity of each biomarker,expect for MPV,and the diagnostic value of each biomarker was compared according to the area under the curve(AUC).Independent-sample t test or Mann-Whitney U test were used for comparison between groups. Result: Compared with AL group,AJI group had significantly higher levels of CRP,ESR,PC,PC/MPV and PCT(all P<0.05),but lower level of MPV (P<0.05).The AUCs for CRP,ESR,PC,PC/MPV and PCT were 0.820, 0.829, 0.689, 0.668 and 0.676,respectively. Based on the Youden index,the optimal predictive cutoff for CRP was 11.12 mg/L,with a sensitivity of 74.4% and a specificity of 87.1%.The optimal predictive cutoff for ESR was 17.60 mm/1 h,with a sensitivity of 81.4% and a specificity of 75.3%.The optimal predictive cutoff for PC was 243.00×109/L,with a sensitivity of 60.6% and a specificity of 71.8%.The optimal predictive cutoff for PC/MPV was 24.95,the sensitivity was 58.1% and the specificity was 74.1%.And the optimal predictive cutoff for PCT was 0.24%,with a sensitivity of 69.8% and a specificity of 63.5%. Conclusion: PC,PC to MPV ratio and PCT were of limited value to diagnose PJI.
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Affiliation(s)
- G Q Shang
- Department of Joint Surgery,Affiliated Hospital of Qingdao University,Qingdao 266000,China
| | - S Xiang
- Department of Joint Surgery,Affiliated Hospital of Qingdao University,Qingdao 266000,China
| | - C C Guo
- Department of Joint Surgery,Affiliated Hospital of Qingdao University,Qingdao 266000,China
| | - J J Guo
- Department of Joint Surgery,Affiliated Hospital of Qingdao University,Qingdao 266000,China
| | - H N Zhang
- Department of Joint Surgery,Affiliated Hospital of Qingdao University,Qingdao 266000,China
| | - Y Z Wang
- Department of Joint Surgery,Affiliated Hospital of Qingdao University,Qingdao 266000,China
| | - H Xu
- Department of Joint Surgery,Affiliated Hospital of Qingdao University,Qingdao 266000,China
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Li Z, Xiang S, Lin Z, Li EN, Yagi H, Cao G, Yocum L, Li L, Hao T, Bruce KK, Fritch MR, Hu H, Wang B, Alexander PG, Khor KA, Tuan RS, Lin H. Graphene oxide-functionalized nanocomposites promote osteogenesis of human mesenchymal stem cells via enhancement of BMP-SMAD1/5 signaling pathway. Biomaterials 2021; 277:121082. [PMID: 34464823 DOI: 10.1016/j.biomaterials.2021.121082] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 08/07/2021] [Accepted: 08/21/2021] [Indexed: 12/28/2022]
Abstract
Biomaterials that can harness the intrinsic osteogenic potential of stem cells offer a promising strategy to accelerate bone regeneration and repair. Previously, we had used methacrylated gelatin (GelMA)-based scaffolds to achieve bone formation from human mesenchymal stem cells (hMSCs). In this study, we aimed to further enhance hMSC osteogenesis by incorporating graphene oxide (GO)-based nanosheets into GelMA. In vitro results showed high viability and metabolic activities in hMSCs encapsulated in the newly developed nanocomposites. Incorporation of GO markedly increased mineralization within hMSC-laden constructs, which was further increased by replacing GO with silica-coated graphene oxide (SiGO). Mechanistic analysis revealed that the nanosheet enhanced the production, retention, and biological activity of endogenous bone morphogenetic proteins (BMPs), resulting in robust osteogenesis in the absence of exogenous osteoinductive growth factors. Specifically, the osteoinductive effect of the nanosheets was abolished by inhibiting the BMP signaling pathway with LDN-193189 treatment. The bone formation potential of the technology was further tested in vivo using a mouse subcutaneous implantation model, where hMSCs-laden GO/GelMA and SiGO/GelMA samples resulted in bone volumes 108 and 385 times larger, respectively, than the GelMA control group. Taken together, these results demonstrate the biological activity and mechanism of action of GO-based nanosheets in augmenting the osteogenic capability of hMSCs, and highlights the potential of leveraging nanomaterials such as GO and SiGO for bone tissue engineering applications.
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Affiliation(s)
- Zhong Li
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Shiqi Xiang
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Zixuan Lin
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Eileen N Li
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, Pittsburgh, PA, USA
| | - Haruyo Yagi
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Guorui Cao
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Lauren Yocum
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - La Li
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Tingjun Hao
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Katherine K Bruce
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, Pittsburgh, PA, USA
| | - Madalyn R Fritch
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Huanlong Hu
- School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
| | - Bing Wang
- Molecular Therapeutics Laboratory, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Peter G Alexander
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Khiam Aik Khor
- School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
| | - Rocky S Tuan
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
| | - Hang Lin
- Center for Cellular & Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
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16
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Xiang S, Li Z, Fritch MR, Li L, Velankar S, Liu Y, Sohn J, Baker N, Lin H, Tuan RS. Caveolin-1 mediates soft scaffold-enhanced adipogenesis of human mesenchymal stem cells. Stem Cell Res Ther 2021; 12:347. [PMID: 34127047 PMCID: PMC8201886 DOI: 10.1186/s13287-021-02356-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Accepted: 04/26/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Human bone marrow-derived mesenchymal stem cells (hBMSCs) can differentiate into adipocytes upon stimulation and are considered an appropriate cell source for adipose tissue engineering. In addition to biochemical cues, the stiffness of a substrate that cells attach to has also been shown to affect hBMSC differentiation potential. Of note, most current studies are conducted on monolayer cultures which do not directly inform adipose tissue engineering, where 3-dimensional (3D) scaffolds are often used to create proper tissue architecture. In this study, we aim to examine the adipogenic differentiation of hBMSCs within soft or stiff scaffolds and investigate the molecular mechanism mediating the response of hBMSCs to substrate stiffness in 3D culture, specifically the involvement of the integral membrane protein, caveolin-1 (CAV1), known to regulate signaling in MSCs via compartmentalizing and concentrating signaling molecules. METHODS By adjusting the photo-illumination time, photocrosslinkable gelatin scaffolds with the same polymer concentration but different stiffnesses were created. hBMSCs were seeded within soft and stiff scaffolds, and their response to adipogenic induction under different substrate mechanical conditions was characterized. The functional involvement of CAV1 was assessed by suppressing its expression level using CAV1-specific siRNA. RESULTS The soft and stiff scaffolds used in this study had a compressive modulus of ~0.5 kPa and ~23.5 kPa, respectively. hBMSCs showed high viability in both scaffold types, but only spread out in the soft scaffolds. hBMSCs cultured in soft scaffolds displayed significantly higher adipogenesis, as revealed by histology, qRT-PCR, and immunostaining. Interestingly, a lower CAV1 level was observed in hBMSCs in the soft scaffolds, concomitantly accompanied by increased levels of Yes-associated protein (YAP) and decreased YAP phosphorylation, when compared to cells seeded in the stiff scaffolds. Interestingly, reducing CAV1 expression with siRNA was shown to further enhance hBMSC adipogenesis, which may function through activation of the YAP signaling pathway. CONCLUSIONS Soft biomaterials support superior adipogenesis of encapsulated hBMSCs in 3D culture, which is partially mediated by the CAV1-YAP axis. Suppressing CAV1 expression levels represents a robust method in the promotion of hBMSC adipogenesis.
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Affiliation(s)
- Shiqi Xiang
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Department of Orthopaedics, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Zhong Li
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Madalyn R Fritch
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - La Li
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Sachin Velankar
- Department of Chem/Petroleum Engineering and Mechanical Engineering & Materials Science, University of Pittsburgh Swanson School of Engineering, Pittsburgh, Pennsylvania, USA
| | - Yuwei Liu
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Jihee Sohn
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Present Address: Biogen, Boston, Massachusetts, USA
| | - Natasha Baker
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Present Address: Department of Oral Biology, University of Pittsburgh School of Dental Medicine, Pittsburgh, Pennsylvania, USA
| | - Hang Lin
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA. .,McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA. .,Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, Pittsburgh, Pennsylvania, USA.
| | - Rocky S Tuan
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA. .,McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA. .,Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, Pittsburgh, Pennsylvania, USA. .,Present Address: Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China.
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17
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Zhang M, Zhang M, Fu X, Meng H, Chen D, Wang M, Zhang L, Li L, Li X, Wang X, Sun Z, Yu H, Li Z, Nan F, Chang Y, Zhou Z, Yan J, Li J, Wang Y, You F, Wang Y, Xiang S, Chen Y, Pan G, Xu H, Zhang B, Yang L. A SINGLE‐ARM, OPEN‐LABEL, PILOT TRIAL OF AUTOLOGOUS CD7‐CAR‐T CELLS FOR CD7 POSITIVE RELAPSED AND REFRACTORY T‐LYMPHOBLASTIC LEUKEMIA/LYMPHOMA. Hematol Oncol 2021. [DOI: 10.1002/hon.181_2880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- M. Zhang
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - M. Zhang
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - X. Fu
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - H. Meng
- PersonGen BioTherapeutics (Suzhou) Co., Ltd. PersonGen BioTherapeutics (Suzhou) Co., Ltd. Suzhou China
| | - D. Chen
- PersonGen BioTherapeutics (Suzhou) Co., Ltd. PersonGen BioTherapeutics (Suzhou) Co., Ltd. Suzhou China
| | - M. Wang
- PersonGen BioTherapeutics (Suzhou) Co., Ltd. PersonGen BioTherapeutics (Suzhou) Co., Ltd. Suzhou China
| | - L. Zhang
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - L. Li
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - X. Li
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - X. Wang
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - Z. Sun
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - H. Yu
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - Z. Li
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - F. Nan
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - Y. Chang
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - Z. Zhou
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - J. Yan
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - J. Li
- The First Affiliated Hospital of Zhengzhou University Department of Oncology Zhengzhou China
| | - Y. Wang
- PersonGen‐Anke Cellular Therapeutics Co., Ltd PersonGen‐Anke Cellular Therapeutics Co., Ltd Suzhou China
| | - F. You
- PersonGen BioTherapeutics (Suzhou) Co., Ltd. PersonGen BioTherapeutics (Suzhou) Co., Ltd. Suzhou China
| | - Y. Wang
- PersonGen BioTherapeutics (Suzhou) Co., Ltd. PersonGen BioTherapeutics (Suzhou) Co., Ltd. Suzhou China
| | - S. Xiang
- PersonGen BioTherapeutics (Suzhou) Co., Ltd. PersonGen BioTherapeutics (Suzhou) Co., Ltd. Suzhou China
| | - Y. Chen
- PersonGen‐Anke Cellular Therapeutics Co., Ltd PersonGen‐Anke Cellular Therapeutics Co., Ltd Suzhou China
| | - G. Pan
- PersonGen‐Anke Cellular Therapeutics Co., Ltd PersonGen‐Anke Cellular Therapeutics Co., Ltd Suzhou China
| | - H. Xu
- PersonGen‐Anke Cellular Therapeutics Co., Ltd PersonGen‐Anke Cellular Therapeutics Co., Ltd Suzhou China
| | - B. Zhang
- PersonGen BioTherapeutics (Suzhou) Co., Ltd. PersonGen BioTherapeutics (Suzhou) Co., Ltd. Suzhou China
| | - L. Yang
- PersonGen BioTherapeutics (Suzhou) Co., Ltd. PersonGen BioTherapeutics (Suzhou) Co., Ltd. Suzhou China
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18
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Abstract
Aims Dystrophic calcification (DC) is the abnormal appearance of calcified deposits in degenerating tissue, often associated with injury. Extensive DC can lead to heterotopic ossification (HO), a pathological condition of ectopic bone formation. The highest rate of HO was found in combat-related blast injuries, a polytrauma condition with severe muscle injury. It has been noted that the incidence of HO significantly increased in the residual limbs of combat-injured patients if the final amputation was performed within the zone of injury compared to that which was proximal to the zone of injury. While aggressive limb salvage strategies may maximize the function of the residual limb, they may increase the possibility of retaining non-viable muscle tissue inside the body. In this study, we hypothesized that residual dead muscle tissue at the zone of injury could promote HO formation. Methods We tested the hypothesis by investigating the cellular and molecular consequences of implanting devitalized muscle tissue into mouse muscle pouch in the presence of muscle injury induced by cardiotoxin. Results Our findings showed that the presence of devitalized muscle tissue could cause a systemic decrease in circulating transforming growth factor-beta 1 (TGF-β1), which promoted DC formation following muscle injury. We further demonstrated that suppression of TGF-β signalling promoted DC in vivo, and potentiated osteogenic differentiation of muscle-derived stromal cells in vitro. Conclusion Taken together, these findings suggest that TGF-β1 may play a protective role in dead muscle tissue-induced DC, which is relevant to understanding the pathogenesis of post-traumatic HO. Cite this article: Bone Joint Res 2020;9(11):742–750.
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Affiliation(s)
- La Li
- Department of Orthopaedic Surgery, Center for Cellular and Molecular Engineering, Pittsburgh, Pennsylvania, USA.,Department of Pathology, Graduate Program of Cellular and Molecular Pathology, Pittsburgh, Pennsylvania, USA
| | - Shiqi Xiang
- Department of Orthopaedic Surgery, Center for Cellular and Molecular Engineering, Pittsburgh, Pennsylvania, USA
| | - Bing Wang
- Department of Orthopaedic Surgery, Center for Cellular and Molecular Engineering, Pittsburgh, Pennsylvania, USA.,Molecular Therapeutics Laboratory Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Hang Lin
- Department of Orthopaedic Surgery, Center for Cellular and Molecular Engineering, Pittsburgh, Pennsylvania, USA
| | - Guorui Cao
- Department of Orthopaedic Surgery, Center for Cellular and Molecular Engineering, Pittsburgh, Pennsylvania, USA
| | - Peter G Alexander
- Department of Orthopaedic Surgery, Center for Cellular and Molecular Engineering, Pittsburgh, Pennsylvania, USA
| | - Rocky S Tuan
- Department of Orthopaedic Surgery, Center for Cellular and Molecular Engineering, Pittsburgh, Pennsylvania, USA.,Department of Pathology, Graduate Program of Cellular and Molecular Pathology, Pittsburgh, Pennsylvania, USA.,The Chinese University of Hong Kong, Hong Kong, Hong Kong
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19
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Sun K, Lin H, Tang Y, Xiang S, Xue J, Yin W, Tan J, Peng H, Alexander PG, Tuan RS, Wang B. Injectable BMP-2 gene-activated scaffold for the repair of cranial bone defect in mice. Stem Cells Transl Med 2020; 9:1631-1642. [PMID: 32785966 PMCID: PMC7695643 DOI: 10.1002/sctm.19-0315] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 06/22/2020] [Accepted: 07/05/2020] [Indexed: 12/20/2022] Open
Abstract
Tissue engineering using adult human mesenchymal stem cells (MSCs) seeded within biomaterial scaffolds has shown the potential to enhance bone healing. Recently, we have developed an injectable, biodegradable methacrylated gelatin‐based hydrogel, which was especially effective in producing scaffolds in situ and allowed the delivery of high viable stem cells and gene vehicles. The well‐demonstrated benefits of recombinant adeno‐associated viral (rAAV) vector, including long‐term gene transfer efficiency and relative safety, combination of gene and cell therapies has been developed in both basic and translational research to support future bone tissue regeneration clinical trials. In this study, we have critically assessed the applicability of single‐step visible light (VL) photocrosslinking fabrication of gelatin scaffold to deliver rAAV encoding human bone morphogenetic protein‐2 (BMP‐2) gene to address the need for sustained BMP‐2 presence localized within scaffolds for the repair of cranial bone defect in mouse model. In this method, rAAV‐BMP‐2 and human bone marrow‐derived MSCs (hBMSCs) were simultaneously included into gelatin scaffolds during scaffold formation by VL illumination. We demonstrated that the subsequent release of rAAV‐BMP‐2 constructs from the scaffold matrix, which resulted in efficient in situ expression of BMP‐2 gene by hBMSCs seeded within the scaffolds, and thus induced their osteogenic differentiation without the supplement of exogenous BMP‐2. The reparative capacity of this novel stem cell‐seeded and gene‐activated scaffolds was further confirmed in the cranial defect in the severe combined immunodeficiency mice, revealed by imaging, histology, and immunohistochemistry at 6 weeks after cranial defect treatment.
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Affiliation(s)
- Kai Sun
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Hang Lin
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Ying Tang
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Shiqi Xiang
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Jingwen Xue
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Weifeng Yin
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Jian Tan
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | | | - Peter G Alexander
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Rocky S Tuan
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Bing Wang
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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20
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Li L, Xiang S, Wang B, Lin H, Kihara S, Sun H, Alexander PG, Tuan RS. TGF-β1 plays a protective role in glucocorticoid-induced dystrophic calcification. Bone 2020; 136:115355. [PMID: 32259685 DOI: 10.1016/j.bone.2020.115355] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 03/31/2020] [Accepted: 04/03/2020] [Indexed: 11/28/2022]
Abstract
Dystrophic calcification (DC) is the deposition of calcium in degenerated tissue which occurs as a reaction to tissue damage. Sometimes if tissue repair fails, it can progress into heterotopic ossification (HO), a pathological condition of abnormal bone formation. HO happens frequently in severe trauma patients such as in blast injury, central nervous system injury and burn injury, in which excessive endogenous glucocorticoid production has always been found. Glucocorticoids have a big impact on bone and muscle. However, few studies have investigated the impact of glucocorticoids on DC/HO formation in muscle. This study aimed to determine the role of glucocorticoids in DC/HO pathogenesis following muscular injury and the possible underlying mechanism. In this study, we administered a high dose of a synthetic glucocorticoid, dexamethasone (DEX), to animals with muscle injury induced by cardiotoxin (CTX) injection to mimic a glucocorticoid excess state following severe muscle trauma. The findings reported here showed that DEX treatment together with CTX-induced muscle injury led to a significant amount of DC in muscle. This effect was likely related to protein level alterations in the fibrinolytic system and resultant decreased circulating transforming growth factor-beta 1 (TGF-β1), given that supplementation of recombinant TGF-β1 markedly rescued this phenomenon. In summary, our results suggest that glucocorticoid excess impairs muscle regeneration and promotes DC/HO, and that TGF-β1 could be a key factor in modulating this process.
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Affiliation(s)
- La Li
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; Graduate Program of Cellular and Molecular Pathology, Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Shiqi Xiang
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Bing Wang
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; Molecular Therapeutics Laboratory, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Hang Lin
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; Graduate Program of Cellular and Molecular Pathology, Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Shinsuke Kihara
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Hui Sun
- Musculoskeletal Growth & Regeneration Laboratory, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Peter G Alexander
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Rocky S Tuan
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; Graduate Program of Cellular and Molecular Pathology, Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
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21
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Wu L, Xiang S, Hu X, Mo M, Zhao C, Cai Y, Tong S, Jiang H, Chen L, Wang Z, Xiong W, Ou Z. Prostate-specific antigen modulates the osteogenic differentiation of MSCs via the cadherin 11-Akt axis. Clin Transl Med 2020; 10:363-373. [PMID: 32508049 PMCID: PMC7240859 DOI: 10.1002/ctm2.27] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 04/02/2020] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND A high prevalence of osteoblastic bone metastases is characteristic of prostate cancer. Prostate-specific antigen (PSA) is a serine protease uniquely produced by prostate cancer cells and is an important serological marker for prostate cancer. However, whether PSA modulates the osteogenic process remains largely unknown. In this study, we explored the effect of PSA on modulating the osteoblastic differentiation of mesenchymal stem cells (MSCs). In this study, we used flow cytometry, CCK-8 assay, Alizarin red S (ARS) staining and quantification, alkaline phosphatase (ALP) activity and staining, Western blotting, and quantitative real-time PCR (qRT-PCR) to explore the effect of PSA on osteogenic differentiation of MSCs. RESULTS We first demonstrated that although PSA did not affect the proliferation, morphology, or phenotype of MSCs, it significantly promoted the osteogenic differentiation of MSCs in a concentration-dependent manner. Furthermore, we demonstrated that PSA promoted the osteogenic differentiation of MSCs by elevating the expression of Cadherin 11 in MSCs and, thus, activating the Akt signaling pathway. CONCLUSIONS In conclusion, we demonstrated that PSA could promote the osteogenesis of MSCs through Akt signaling pathway activation by elevating the expression of cadherin-11 in MSCs. These findings imply a possible role of PSA in osteoblastic bone metastases in prostate cancer.
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Affiliation(s)
- Longxiang Wu
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
| | - Shiqi Xiang
- Department of OrthopedicsThe Second Xiangya Hospital of Central South UniversityChangshaP.R. China
| | - Xiheng Hu
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
| | - Miao Mo
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
| | - Cheng Zhao
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
| | - Yi Cai
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
| | - Shiyu Tong
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
| | - Huichuan Jiang
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
| | - Linxiao Chen
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
| | - Zhi Wang
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
| | - Wei Xiong
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
| | - Zhenyu Ou
- Department of UrologyXiangya Hospital of Central South UniversityChangshaP.R. China
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22
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Abstract
Musculoskeletal injuries and associated conditions are the leading cause of physical disability worldwide. The concept of tissue engineering has opened up novel approaches to repair musculoskeletal defects in a fast and/or efficient manner. Biomaterials, cells, and signaling molecules constitute the tissue engineering triad. In the past 40 years, significant progress has been made in developing and optimizing all three components, but only a very limited number of technologies have been successfully translated into clinical applications. A major limiting factor of this barrier to translation is the insufficiency of two-dimensional cell cultures and traditional animal models in informing the safety and efficacy of in-human applications. In recent years, microphysiological systems, often referred to as organ or tissue chips, generated according to tissue engineering principles, have been proposed as the next-generation drug testing models. This chapter aims to first review the current tissue engineering-based approaches that are being applied to fabricate and develop the individual critical elements involved in musculoskeletal organ/tissue chips. We next highlight the general strategy of generating musculoskeletal tissue chips and their potential in future regenerative medicine research. Exemplary microphysiological systems mimicking musculoskeletal tissues are described. With sufficient physiological accuracy and relevance, the human cell-derived, three-dimensional, multi-tissue systems have been used to model a number of orthopedic disorders and to test new treatments. We anticipate that the novel emerging tissue chip technology will continually reshape and improve our understanding of human musculoskeletal pathophysiology, ultimately accelerating the development of advanced pharmaceutics and regenerative therapies.
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Affiliation(s)
- Zhong Li
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Shiqi Xiang
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Eileen N Li
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, Pittsburgh, PA, USA
| | - Madalyn R Fritch
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Peter G Alexander
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Hang Lin
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, Pittsburgh, PA, USA
| | - Rocky S Tuan
- Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
- Department of Bioengineering, University of Pittsburgh Swanson School of Engineering, Pittsburgh, PA, USA.
- Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China.
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Li Z, Du Y, Xiang S, Feng B, Bian Y, Qian W, Jin J, Lin J, Weng X. Risk factors of perioperative complications and transfusion following total hip arthroplasty in systemic lupus erythematosus patients. Lupus 2019; 28:1134-1140. [PMID: 31296142 DOI: 10.1177/0961203319862609] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND In recent years, hip arthroplasty rates in systemic lupus erythematosus (SLE) patients have been increasing rapidly. Although patients with SLE generally show beneficial or desirable functional outcomes following total hip arthroplasty (THA), it has been reported that SLE patients after THA have increased risk of postoperative complications, especially during the period of hospitalization. OBJECTIVES In the present study, we aimed to identify possible factors associated with complications or transfusion of THA in SLE patients during hospitalization. METHODS The present study was a retrospective study conducted in Peking Union Medical College Hospital. Data were collected from medical records of patients who underwent THA from January 2012 to June 2018. The primary outcome variable was perioperative complications, which was defined as having one or more of the following conditions: high fever, infection, impaired wound healing, venous thrombosis of the lower extremities, hematoma, arrhythmia, implant complications. The secondary outcome was perioperative transfusion. RESULTS During January 2012 to June 2018, 100 patients had taken the surgery of THA. After multivariate analysis, independent risk factors for perioperative complications were: age ≥ 45 years (p = 0.001), SLE with other connective tissue diseases (p = 0.029), high temperature (p = 0.030), positive anti-dsDNA antibody (p = 0.043), and Systemic Lupus International Collaborative Clinics/American College of Rheumatology (SLICC/ACR) Damage Index ≥ 3 (p = 0.008). Independent risk factors for perioperative transfusion were bilateral THA (p = 0.029), low hemoglobin (p = 0.021) and abnormal renal function (p = 0.021). CONCLUSION For SLE patients following THA, age > 45 years, SLE with other connective tissue disease, high temperature, positive anti-dsDNA antibody and SLICC/ACR Damage Index ≥ 3 were the risk factors of complications during hospitalization and bilateral THA, low hemoglobin and abnormal renal function were the risk factors of transfusion.
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Affiliation(s)
- Z Li
- 1 Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
| | - Y Du
- 2 Office of Clinical Epidemiology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
| | - S Xiang
- 3 Department of Joint Surgery, The Affiliated Hospital of Qingdao University, China
| | - B Feng
- 1 Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
| | - Y Bian
- 1 Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
| | - W Qian
- 1 Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
| | - J Jin
- 1 Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
| | - J Lin
- 1 Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
| | - X Weng
- 1 Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
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Zhang Y, Xiang S, Guo X, Wen A, Hao Y. All-optical inhibitory dynamics in photonic neuron based on polarization mode competition in a VCSEL with an embedded saturable absorber. Opt Lett 2019; 44:1548-1551. [PMID: 30933087 DOI: 10.1364/ol.44.001548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 02/15/2019] [Indexed: 06/09/2023]
Abstract
An all-optical spike inhibition scheme based on polarization-mode competition (PMC) in a vertical-cavity surface-emitting laser (VCSEL) with an embedded saturable absorber is proposed and investigated numerically. The inhibitory dynamics is characterized by spike amplitude and first-spike latency (FSL) for the first time, to the best of our knowledge. The effects of time differences between inhibitory and excitatory inputs, inputs strengths, bias current, as well as noise on the spike amplitude and FSL are examined. The results show that a spike can be triggered in the y-polarization mode by excitatory input and can be inhibited in the presence of inhibitory input due to PMC.
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Xiang S, Tang HW, Zhou J, Li XZ. Electrospinning of Hydroxypropyl-beta-cyclodextrin/Polyvinylpyrrolidone Resveratrol-loaded Nanofibers: Preparation and Characterization. Indian J Pharm Sci 2019. [DOI: 10.36468/pharmaceutical-sciences.552] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Xiang S, Lian F. Effects of bushen huatan recipe on the AKT-GLUT4 insulin signal pathway of ovarian granular cells in polycystic ovarian syndrome and IVF outcomes in these infertile patients. Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kern B, Budihardjo JD, Mermulla S, Quan A, Cadmi C, Lopez J, Khusheim M, Xiang S, Park J, Furtmüller GJ, Sarhane KA, Schneeberger S, Lee WPA, Hoke A, Tuffaha SH, Brandacher G. A Novel Rodent Orthotopic Forelimb Transplantation Model That Allows for Reliable Assessment of Functional Recovery Resulting From Nerve Regeneration. Am J Transplant 2017; 17:622-634. [PMID: 27500557 DOI: 10.1111/ajt.14007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 07/28/2016] [Accepted: 08/04/2016] [Indexed: 01/25/2023]
Abstract
Improved nerve regeneration and functional outcomes would greatly enhance the utility of vascularized composite allotransplantation (VCA) such as hand and upper extremity transplantation. However, research aimed at achieving this goal has been limited by the lack of a functional VCA animal model. We have developed a novel rat midhumeral forelimb transplant model that allows for the characterization of upper extremity functional recovery following transplantation. At the final end point of 12 weeks, we found that animals with forelimb transplantation including median, ulnar and radial nerve coaptation demonstrated significantly improved grip strength and forelimb function as compared to forelimb transplantation without nerve approximation (grip strength: 1.71N ± 0.57 vs. no appreciable recovery; IBB scale: 2.6 ± 0.7? vs. 0.8 ± 0.40; p = 0.0005), and similar recovery to nerve transection-and-repair only (grip strength: 1.71N ± 0.57 vs. 2.03 ± 0.42.6; IBB scale: 2.6 ± 0.7 vs. 2.8 ± 0.8; p = ns). Moreover, all forelimb transplant animals with nerve coaptation displayed robust axonal regeneration with myelination and reduced flexor muscle atrophy when compared to forelimb transplant animals without nerve coaptation. In conclusion, this is the first VCA small-animal model that allows for reliable and reproducible measurement of behavioral functional recovery in addition to histologic evaluation of nerve regeneration and graft reinnervation.
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Affiliation(s)
- B Kern
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD.,Department of Visceral, Transplant, and Thoracic Surgery, Innsbruck Medical University, Innsbruck, Austria
| | - J D Budihardjo
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - S Mermulla
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - A Quan
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - C Cadmi
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - J Lopez
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - M Khusheim
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - S Xiang
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - J Park
- Department of Neurology and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD
| | - G J Furtmüller
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - K A Sarhane
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - S Schneeberger
- Department of Visceral, Transplant, and Thoracic Surgery, Innsbruck Medical University, Innsbruck, Austria
| | - W P A Lee
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - A Hoke
- Department of Neurology and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD
| | - S H Tuffaha
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
| | - G Brandacher
- Department of Plastic and Reconstructive Surgery, Vascularized Composite Allotransplantation (VCA) Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD
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Li N, Liu B, Xiang S, Shi L. Similar enhancement of BK(Ca) channel function despite different aerobic exercise frequency in aging cerebrovascular myocytes. Physiol Res 2016; 65:447-59. [PMID: 27070745 DOI: 10.33549/physiolres.933111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Aerobic exercise showed beneficial influence on cardiovascular systems in aging, and mechanisms underlying vascular adaption remain unclear. Large-conductance Ca(2+)-activated K(+) (BK(Ca)) channels play critical roles in regulating cellular excitability and vascular tone. This study determined the effects of aerobic exercise on aging-associated functional changes in BK(Ca) channels in cerebrovascular myocytes, Male Wistar rats aged 20-22 months were randomly assigned to sedentary (O-SED), low training frequency (O-EXL), and high training frequency group (O-EXH). Young rats were used as control. Compared to young rats, whole-cell BK(Ca) current was decreased, and amplitude of spontaneous transient outward currents were reduced. The open probability and Ca(2+)/voltage sensitivity of single BK(Ca) channel were declined in O-SED, accompanied with a reduction of tamoxifen-induced BK(Ca) activation; the mean open time of BK(Ca) channels was shortened whereas close time was prolonged. Aerobic exercise training markedly alleviated the aging-associated decline independent of training frequency. Exercise three times rather than five times weekly may be a time and cost-saving training volume required to offer beneficial effects to offset the functional declines of BK(Ca) during aging.
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Affiliation(s)
- N Li
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China, Department of Exercise Physiology, Beijing Sport University, Beijing, China.
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Xiang S, Fuji K, Sato S, Xiao S, Bird JP, Aoki N, Ochiai Y. Metal-insulator transition in the quasi-one-dimensional transport of fractional quantum Hall states. J Phys Condens Matter 2015; 27:202201. [PMID: 25920938 DOI: 10.1088/0953-8984/27/20/202201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We investigate edge state transmission in quantum point contacts (QPCs) in the fractional quantum-Hall regime, finding behavior reminiscent of a metal-insulator transition. The transition is suggested by an unusual behavior of the differential conductance in the fractional-quantum-Hall regime, and by the presence of a fixed point and universal scaling in the temperature dependence of the linear conductance. Noting that the 0.7 feature evolves continuously into a last fractional plateau at high magnetic fields, we suggest that this still unresolved feature may itself be viewed as a manifestation of a local, microscopic, metal-insulator transition.
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Affiliation(s)
- S Xiang
- Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
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Cupelli ET, Escallier L, Galambos N, Xiang S, Franco I. Sensory processing differences and urinary incontinence in school-aged children. J Pediatr Urol 2014; 10:880-5. [PMID: 24636484 DOI: 10.1016/j.jpurol.2014.01.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2013] [Accepted: 01/03/2014] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Urinary Incontinence (UI) is a common problem among school-aged children (5-11 years). Symptoms such as urgency, diminished awareness of wetting, or apparent apathy may represent differences in sensory processing (SP). This study aims to describe the SP abilities of incontinent school-aged children with typical development to determine if they differ from established norms for continent children. MATERIALS AND METHODS The SP abilities of 209 school-aged children with UI were evaluated using the short sensory profile (SSP), a judgment-based caregiver questionnaire, then compared with established norms using descriptive and inferential statistics. RESULTS Forty-four percent of children showed significant differences in global SP with the greatest differences noted in tactile sensitivity. Higher section subscores were also noted in "seeks sensation/under responsive" and "auditory sensitivity". Children with dysfunctional voiding (DV) were more likely to show global differences (p = 0.015), differences in "seeks sensation" (p = 0.006), and auditory sensitivity (p = 0.041). The odds for low tactile sensitivity scores were five times greater for children with UI and DV (p = 0.006). CONCLUSION These results suggest that differences in SP may be found among typical school aged children with UI. Continued research is indicated to understand the significance of the study results.
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Affiliation(s)
- E T Cupelli
- Maimonides Medical Center & Pediatric Urology Associates, 909 49th Street, Brooklyn, New York 11219, NY, USA.
| | - L Escallier
- Stony Brook University HSC, Room 224, Stony Brook, New York 11794, NY, USA
| | - N Galambos
- Maimonides Medical Center & Pediatric Urology Associates, 909 49th Street, Brooklyn, New York 11219, NY, USA
| | - S Xiang
- Maimonides Medical Center & Pediatric Urology Associates, 909 49th Street, Brooklyn, New York 11219, NY, USA
| | - I Franco
- New York Medical College, Vallhalla, New York, USA; Pediatric Urology Associates, 909 49th St., Brooklyn, New York 11219, NY, USA
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Xiang S, Xiao S, Fuji K, Shibuya K, Endo T, Yumoto N, Morimoto T, Aoki N, Bird JP, Ochiai Y. On the zero-bias anomaly and Kondo physics in quantum point contacts near pinch-off. J Phys Condens Matter 2014; 26:125304. [PMID: 24599094 DOI: 10.1088/0953-8984/26/12/125304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We investigate the linear and non-linear conductance of quantum point contacts (QPCs), in the region near pinch-off where Kondo physics has previously been connected to the appearance of the 0.7 feature. In studies of seven different QPCs, fabricated in the same high-mobility GaAs/AlGaAs heterojunction, the linear conductance is widely found to show the presence of the 0.7 feature. The differential conductance, on the other hand, does not generally exhibit the zero-bias anomaly (ZBA) that has been proposed to indicate the Kondo effect. Indeed, even in the small subset of QPCs found to exhibit such an anomaly, the linear conductance does not always follow the universal temperature-dependent scaling behavior expected for the Kondo effect. Taken collectively, our observations demonstrate that, unlike the 0.7 feature, the ZBA is not a generic feature of low-temperature QPC conduction. We furthermore conclude that the mere observation of the ZBA alone is insufficient evidence for concluding that Kondo physics is active. While we do not rule out the possibility that the Kondo effect may occur in QPCs, our results appear to indicate that its observation requires a very strict set of conditions to be satisfied. This should be contrasted with the case of the 0.7 feature, which has been apparent since the earliest experimental investigations of QPC transport.
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Affiliation(s)
- S Xiang
- Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
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Cernicchiaro N, Renter DG, Xiang S, White BJ, Bello NM. Hierarchical Bayesian modeling of heterogeneous variances in average daily weight gain of commercial feedlot cattle. J Anim Sci 2013; 91:2910-9. [PMID: 23482583 DOI: 10.2527/jas.2012-5543] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Variability in ADG of feedlot cattle can affect profits, thus making overall returns more unstable. Hence, knowledge of the factors that contribute to heterogeneity of variances in animal performance can help feedlot managers evaluate risks and minimize profit volatility when making managerial and economic decisions in commercial feedlots. The objectives of the present study were to evaluate heteroskedasticity, defined as heterogeneity of variances, in ADG of cohorts of commercial feedlot cattle, and to identify cattle demographic factors at feedlot arrival as potential sources of variance heterogeneity, accounting for cohort- and feedlot-level information in the data structure. An operational dataset compiled from 24,050 cohorts from 25 U. S. commercial feedlots in 2005 and 2006 was used for this study. Inference was based on a hierarchical Bayesian model implemented with Markov chain Monte Carlo, whereby cohorts were modeled at the residual level and feedlot-year clusters were modeled as random effects. Forward model selection based on deviance information criteria was used to screen potentially important explanatory variables for heteroskedasticity at cohort- and feedlot-year levels. The Bayesian modeling framework was preferred as it naturally accommodates the inherently hierarchical structure of feedlot data whereby cohorts are nested within feedlot-year clusters. Evidence for heterogeneity of variance components of ADG was substantial and primarily concentrated at the cohort level. Feedlot-year specific effects were, by far, the greatest contributors to ADG heteroskedasticity among cohorts, with an estimated ∼12-fold change in dispersion between most and least extreme feedlot-year clusters. In addition, identifiable demographic factors associated with greater heterogeneity of cohort-level variance included smaller cohort sizes, fewer days on feed, and greater arrival BW, as well as feedlot arrival during summer months. These results support that heterogeneity of variances in ADG is prevalent in feedlot performance and indicate potential sources of heteroskedasticity. Further investigation of factors associated with heteroskedasticity in feedlot performance is warranted to increase consistency and uniformity in commercial beef cattle production and subsequent profitability.
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Affiliation(s)
- N Cernicchiaro
- Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan 66506, USA
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Xiang S, Mao L, Duplessis T, Yuan L, Dauchy R, Dauchy E, Blask DE, Frasch T, Hill SM. Oscillation of clock and clock controlled genes induced by serum shock in human breast epithelial and breast cancer cells: regulation by melatonin. Breast Cancer (Auckl) 2012; 6:137-50. [PMID: 23012497 PMCID: PMC3448497 DOI: 10.4137/bcbcr.s9673] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This study investigates differences in expression of clock and clock-controlled genes (CCGs) between human breast epithelial and breast cancer cells and breast tumor xenografts in circadian intact rats and examines if the pineal hormone melatonin influences clock gene and CCG expression. Oscillation of clock gene expression was not observed under standard growth conditions in vitro, however, serum shock (50% horse serum for 2 h) induced oscillation of clock gene and CCG expression in MCF-10A cells, which was repressed or disrupted in MCF-7 cells. Melatonin administration following serum shock differentially suppressed or induced clock gene (Bmal1 and Per2) and CCG expression in MCF10A and MCF-7 cells. These studies demonstrate the lack of rhythmic expression of clock genes and CCGs of cells in vitro and that transplantation of breast cancer cells as xenografts into circadian competent hosts re-establishes a circadian rhythm in the peripheral clock genes of tumor cells.
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Affiliation(s)
- S Xiang
- Department of Structural and Cellular Biology, Tulane University School of Medicine, 1430 Tulane Avenue, New Orleans, LA 70112, USA
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Tong L, Xiang S, Mandel C, Bai Y, Manley J. Structural studies of pre-mRNA 3′-end processing. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308097092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Zhang F, Chen XP, Zhang W, Dong HH, Xiang S, Zhang WG, Zhang BX. Combined hepatocellular cholangiocarcinoma originating from hepatic progenitor cells: immunohistochemical and double-fluorescence immunostaining evidence. Histopathology 2008; 52:224-32. [PMID: 18184271 DOI: 10.1111/j.1365-2559.2007.02929.x] [Citation(s) in RCA: 136] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
AIMS Combined hepatocellular cholangiocarcinoma (CHC) is a rare form of primary liver cancer, showing a mixture of hepatocellular and biliary features. Data suggest that most CHC arise from hepatic progenitor cells (HPCs). The aim was to investigate the origin of CHC. METHODS AND RESULTS Twelve cases of CHC were studied by immunohistochemistry for hepatocytic (hepPar1, alpha-fetoprotein), cholangiocytic cytokeratin [(CK) 7, CK19], hepatic progenitor cell (OV-6), haematopoietic stem cell (c-kit, CD34), as well as CD45 and chromogranin-A markers. The combination of double-fluorescence immunostaining consisted of HepPar1 with CK19, and c-kit with OV-6. All 12 cases demonstrated more or less transitional areas, with strands/trabeculae of small, uniform, oval-shaped cells including scant cytoplasm and hyperchromatic nuclei embedded within a thick, desmoplastic stroma; however, two cases were found to consist entirely of such transitional areas. Simultaneous co-expression of hepPar1 and CK7, or CK19, was demonstrated in 10/12 (83.3%) cases of CHC. c-kit expression was noted in 10/12 (83.3%) cases, of which 7/10 (70%) showed co-expression of OV-6. CONCLUSIONS The results suggest that CHC are of HPC origin, supporting the concept that human hepatocarcinogenesis may originate from the transformation of HPCs.
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Affiliation(s)
- F Zhang
- Hepatic Surgery Centre, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Yang Y, Ghiran I, Shields H, Xiang S, Fruehauf J, Upton M, LaMont T, Li C. 504 POSTER Centrosome abnormalities occur early and coexist with genomic instability during cancer progression in Barrett's esophagus. EJC Suppl 2006. [DOI: 10.1016/s1359-6349(06)70509-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Huang D, Yang J, Wan W, Ding F, Zhang L, Liu Y, Xiang S. Cholesteric Metallomesogens Containing Optically Active Metal-Tricarbony Moieties. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259608042230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- D. Huang
- a Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences , Chengdu , 610041 , P.R. China
| | - J. Yang
- a Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences , Chengdu , 610041 , P.R. China
| | - W. Wan
- a Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences , Chengdu , 610041 , P.R. China
| | - F. Ding
- a Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences , Chengdu , 610041 , P.R. China
| | - L. Zhang
- a Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences , Chengdu , 610041 , P.R. China
| | - Y. Liu
- b Department of Chemistry , Sichuan Normal University , Chengdu , 610066 , P.R. China
| | - S. Xiang
- b Department of Chemistry , Sichuan Normal University , Chengdu , 610066 , P.R. China
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Xiang S, Carter CW, Bricogne G, Gilmore CJ. Entropy maximization constrained by solvent flatness: a new method for macromolecular phase extension and map improvement. Acta Crystallogr D Biol Crystallogr 2005; 49:193-212. [PMID: 15299561 DOI: 10.1107/s0907444992008540] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A practical generally applicable procedure for exponential modeling to maximum likelihood of macromolecular data sets constrained by a moderately large basis set of reliable phases and a molecular envelope is described, based on the computer program MICE [Bricogne & Gilmore (1990). Acta Cryst. A46, 284-297]. Procedures were first tested with simulated data sets. Exact and randomly perturbed amplitudes and phases were generated, together with a known envelope for solvent-free protein and for protein in an electron-dense crystal mother liquor typical of many real protein crystals. These experiments established useful guidelines and values for various parameters. Tests with basis sets chosen from the largest amplitudes indicate that exponential models with considerable correct extrapolated phase and amplitude information can be constructed from as few as 16% of the total number of reflections, with mean phase errors of about 30 degrees, at resolution limits of either 5 or 3 A. When the shape of the solvent channels in macromolecular crystals is known, it offers an important additional source of information. MICE was, therefore, adapted to average the density outside the molecular boundary defined by an input envelope. This flattening process imposes a uniform density distribution in solvent-filled channels as an additional constraint on the exponential model and is analogous to the treatment of solvent in conventional solvent flattening. Experimental data for cytidine deaminase, a structure recently solved by making extensive use of conventional solvent flattening, provides an example of the performance of maximum-entropy methods in a real situation and a compelling comparison of this method to standard procedures. Exponential models of the electron density constrained by the most reliable phases obtained by multiple isomorphous replacement with anomalous scattering (MIRAS) (figure of merit > 0.7, representing 34% of the total number of reflections) and by the envelope give rise to centroid electron-density maps which are quantitatively superior by numerous statistical criteria to conventionally solvent-flattened density. Similarity of these maps to the 2F(obs) - F(calc) map calculated with phases obtained after crystallographic refinement of the model implies that maximum-entropy extrapolation provides better phases for the remaining 66% of the reflections than the original centroid MIRAS distributions. Importantly, the solvent-flattened electron density, although it did permit interpretation of the map which was not readily accomplished with the MIRAS map, contains substantial errors. It is proposed that errors of this sort may account for previously noted deficiencies of the solvent-flattening method [Fenderson, Herriott & Adman (1990). J. Appl. Cryst. 23, 115-131] and for the occasional tendency of incorrect interpretations to be 'locked in' by crystallographic refinement [Brändén & Jones (1990). Nature (London), 343, 687-689, and references cited therein]. Solvent flattening with combined maximization of entropy and likelihood represents a phase-refinement path independent of atomic models, using the experimental amplitudes and the most reliable phases. It should, therefore, become a valuable and generally useful procedure in macromolecular crystal structure determination.
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Affiliation(s)
- S Xiang
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, USA
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Poskitt KJ, Marotta T, Culham G, Xiang S. MR Quantification of Flow in Children with Vein of Galen Malformations. Interv Neuroradiol 2001; 7:213-22. [PMID: 20663350 DOI: 10.1177/159101990100700305] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2001] [Accepted: 07/15/2001] [Indexed: 11/17/2022] Open
Abstract
SUMMARY Vein of Galen vascular malformations are either Vein of Galen Aneurysmal malformations (VGAMs) or Vein of Galen Aneurysmal Dilatations (VGADs). VGAMs may be of the choroidal or mural type and are fistulas associated with the precursor of the vein of Galen. The treatment of VGAMs is aimed at controlling the size of the vascular shunt since it is believed that the shunt is responsible for venous hypertension, cardiac stress, delayed development and may be so large as to damage the brain. In VGAMs as noted by Berenstein and Lasjaunias. Absolute measures of flow may contribute to our understanding of CNS disease and permit objective measures of the success or failure of therapeutic interventions (5). MR phase contrast cine angiographic techniques can be employed to measure bulk flow in intracranial vessels. Vein of Galen vascular malformations are an ideal model to measure venous flow as the draining vein is large and angiographic evaluation is limited. Thus our goal was to develop an objective non-invasive method of measuring vascular flow in VGAMs and VGADs (6) . Herein we report our experience using this technique in a group of patients with Vein of Galen vascular malformations. We also hypothesized that the degree of shunting would correlate to the degree of cardiac stress and be an indicator of optimal timing for intervention. We believe that we have succeeded in our goal to develop an objective, non-invasive method of shunt quantification using velocity encoded MR sequences. This promises new insight into the hemodynamics, natural history and treatment response of vascular malformations.
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Affiliation(s)
- K J Poskitt
- Department of Radiology, Children's Hospital, Vancouver, Canada
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Sato S, Xiang S, Raleigh DP. On the relationship between protein stability and folding kinetics: a comparative study of the N-terminal domains of RNase HI, E. coli and Bacillus stearothermophilus L9. J Mol Biol 2001; 312:569-77. [PMID: 11563917 DOI: 10.1006/jmbi.2001.4968] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
There is currently a great deal of interest in proteins that fold in a single highly cooperative step. Particular attention has been focused on elucidating the factors that govern folding rates of simple proteins. Recently, the topology of the native state has been proposed to be the most important determinant of their folding rates. Here we report a comparative study of the folding of three topologically equivalent proteins that adapt a particularly simple alpha/beta fold. The folding kinetics of the N-terminal domain of RNase HI and the N-terminal domain of the ribosomal protein L9 from Escherichia coli (eNTL9) were compared to the previously characterized N-terminal domain of L9 from Bacillus stearothermophilus (bNTL9). This 6.2 kDa protein, which is one of simplest examples of the ABCalphaD motif, folds via a two-state mechanism on the millisecond to submillisecond time scale. The RNase HI domain and bNTL9 have very similar tertiary structures but there is little similarity in primary sequence. bNTL9 and eNTL9 share the same biological function and a similar primary sequence but differ significantly in stability. Fluorescence-detected stopped-flow experiments showed that the three proteins fold in a two-state fashion. The folding rates in the absence of denaturant were found to be very different, ranging form 21 s(-1) to 790 s(-1) at 10 degrees C. The diverse folding rates appear to reflect large differences in the stability of the proteins. When compared at an isostability point, the folding rates converged to a similar value and there is a strong linear correlation between the log of the folding rate and stability for this set of proteins. These observations are consistent with the idea that stability can play an important role in dictating relative folding rates among topologically equivalent proteins.
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Affiliation(s)
- S Sato
- Department of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794-3400, USA
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Boren J, Lookene A, Makoveichuk E, Xiang S, Gustafsson M, Liu H, Talmud P, Olivecrona G. Binding of low density lipoproteins to lipoprotein lipase is dependent on lipids but not on apolipoprotein B. J Biol Chem 2001; 276:26916-22. [PMID: 11331277 DOI: 10.1074/jbc.m011090200] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Lipoprotein lipase (LPL) efficiently mediates the binding of lipoprotein particles to lipoprotein receptors and to proteoglycans at cell surfaces and in the extracellular matrix. It has been proposed that LPL increases the retention of atherogenic lipoproteins in the vessel wall and mediates the uptake of lipoproteins in cells, thereby promoting lipid accumulation and plaque formation. We investigated the interaction between LPL and low density lipoproteins (LDLs) with special reference to the protein-protein interaction between LPL and apolipoprotein B (apoB). Chemical modification of lysines and arginines in apoB or mutation of its main proteoglycan binding site did not abolish the interaction of LDL with LPL as shown by surface plasmon resonance (SPR) and by experiments with THP-I macrophages. Recombinant LDL with either apoB100 or apoB48 bound with similar affinity. In contrast, partial delipidation of LDL markedly decreased binding to LPL. In cell culture experiments, phosphatidylcholine-containing liposomes competed efficiently with LDL for binding to LPL. Each LDL particle bound several (up to 15) LPL dimers as determined by SPR and by experiments with THP-I macrophages. A recombinant NH(2)-terminal fragment of apoB (apoB17) bound with low affinity to LPL as shown by SPR, but this interaction was completely abolished by partial delipidation of apoB17. We conclude that the LPL-apoB interaction is not significant in bridging LDL to cell surfaces and matrix components; the main interaction is between LPL and the LDL lipids.
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Affiliation(s)
- J Boren
- Wallenberg Laboratory, Göteborg University, S-41345 Göteborg, Sweden.
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Zhang X, Li L, Jung J, Xiang S, Hollmann C, Choi YS. The distinct roles of T cell-derived cytokines and a novel follicular dendritic cell-signaling molecule 8D6 in germinal center-B cell differentiation. J Immunol 2001; 167:49-56. [PMID: 11418631 DOI: 10.4049/jimmunol.167.1.49] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Germinal center-B (GC-B) cells differentiate into memory B cells and plasma cells (PC) through interaction with T cells and follicular dendritic cells (FDC). Activated T cell and FDC play distinct roles in this process. The detailed kinetic experiments revealed that cytokines secreted by activated T cells determined the pathway of GC-B cell differentiation. IL-4 directs GC-B cells to differentiate into memory B cells, whereas IL-10 steers them into PC. FDC/HK cells do not direct either pathway, but provide signals for proliferation of GC-B cells. A novel FDC-signaling molecule 8D6 (FDC-SM-8D6) produced by FDC augments PC generation in the GC. FDC-SM-8D6-specific mAb blocked PC generation and IgG secretion but not memory B cell proliferation. COS cells expressing FDC-SM-8D6 enhanced GC-B cell proliferation and Ab secretion, which was blocked by mAb 8D6. In the cultures with B cell subsets, PC generation was inhibited by mAb 8D6 in the cultures with CD27(+) B cells but not in the culture with CD27(-) B cells, suggesting that CD27(+) PC precursor is the specific target of FDC-SM-8D6 stimulation.
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Affiliation(s)
- X Zhang
- Laboratory of Cellular Immunology, Alton Ochsner Medical Foundation, New Orleans, LA 70121, USA
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Abstract
BACKGROUND Molybdenum cofactor (Moco) biosynthesis is an evolutionarily conserved pathway present in archaea, eubacteria, and eukaryotes. In humans, genetic abnormalities in the biosynthetic pathway result in Moco deficiency, which is accompanied by severe neurological symptoms and death shortly after birth. The Escherichia coli MoeA and MogA proteins are involved in the final step of Moco biosynthesis: the incorporation of molybdenum into molybdopterin (MPT), the organic pyranopterin moiety of Moco. RESULTS The crystal structure of E. coli MoeA has been refined at 2 A resolution and reveals that the highly elongated MoeA monomer consists of four clearly separated domains, one of which is structurally related to MogA, indicating a divergent evolutionary relationship between both proteins. The active form of MoeA is a dimer, and a putative active site appears to be localized to a cleft formed between domain II of the first monomer and domains III and IV of the second monomer. CONCLUSIONS In eukaryotes, MogA and MoeA are fused into a single polypeptide chain. The corresponding mammalian protein gephyrin has also been implicated in the anchoring of glycinergic receptors to the cytoskeleton at inhibitory synapses. Based on the structures of MoeA and MogA, gephyrin is surmised to be a highly organized molecule containing at least five domains. This multidomain arrangement could provide a structural basis for its functional diversity. The oligomeric states of MoeA and MogA suggest how gephyrin could assemble into a hexagonal scaffold at inhibitory synapses.
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Affiliation(s)
- S Xiang
- Department of Physiology and Biophysics, State University of New York at Stony Brook, 11794, USA
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Hori M, Xiang S, Qi CF, Chattopadhyay SK, Fredrickson TN, Hartley JW, Kovalchuk AL, Bornkamm GW, Janz S, Copeland NG, Jenkins NA, Ward JM, Morse HC. Non-Hodgkin Lymphomas of Mice. Blood Cells Mol Dis 2001; 27:217-22. [PMID: 11358382 DOI: 10.1006/bcmd.2000.0375] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Studies of lymphoid neoplasms occurring in normal or genetically engineered mice have revealed parallels and differences to non-Hodgkin lymphomas (NHL) of humans. Some mouse lymphomas have strong histologic similarities to the human NHL subsets including precursor B- and T-cell lymphoblastic, small lymphocytic, splenic marginal zone, and diffuse large-cell B-cell lymphomas (DLCL); whether molecular parallels also exist is under study. Others mouse types such as sIg+ lymphoblastic B-cell lymphoma have no histologic equivalent in human NHL even though they share molecular deregulation of BCL6 with human DLCL. Finally, Burkitt lymphoma does not appear to occur naturally in mice, but it can be induced with appropriately engineered transgenes.
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Affiliation(s)
- M Hori
- Laboratory of Immunopathology, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20892, USA
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Zhao Y, Chen Z, Saxer C, Shen Q, Xiang S, de Boer JF, Nelson JS. Doppler standard deviation imaging for clinical monitoring of in vivo human skin blood flow. Opt Lett 2000; 25:1358-60. [PMID: 18066216 DOI: 10.1364/ol.25.001358] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
We used a novel phase-resolved optical Doppler tomographic (ODT) technique with very high flow-velocity sensitivity (10microm/s) and high spatial resolution (10microm) to image blood flow in port-wine stain (PWS) birthmarks in human skin. In addition to the regular ODT velocity and structural images, we use the variance of blood flow velocity to map the PWS vessels. Our device combines ODT and therapeutic systems such that PWS blood flow can be monitored in situ before and after laser treatment. To the authors' knowledge this is the first clinical application of ODT to provide a fast semiquantitative evaluation of the efficacy of PWS laser therapy in situ and in real time.
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Xie L, Pang R, Jin Y, Xiang S, Li H. Effects of hepatic artery chemotherapeutic embolization combined with perfusing LAK cells into hepatic artery after radical operation of liver cancer. Zhonghua Gan Zang Bing Za Zhi 2000; 8:142-3. [PMID: 10880159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
OBJECTIVE To evaluate the effects of hepatic artery chemotherapeutic embolization combined with perfusing LAK cells/interleukin 2 into hepatic artery after radical operation of liver cancer. METHODS Random divide 42 cases into two groups who had accepted radical operation of liver cancer: 21 cases who accepted hepatic artery chemotherapeutic embolization combined with perfusing LAK cells/interleukin 2 into hepatic artery as observing group, 21 cases accepted simply hepatic artery chemotherapeutic embolization as control group. RESULTS The intrahepatic recurrence rates of 1, 2, and 3 years were 0, 19.05%, 57.14% in observing group, lower than 28.57%, 47.62%, 85.71% of control group (chi(2)=4.86, 3. 86 and 4.20 respectively, P<0.05). The survival rates of 2 and 3 years were 85.71%, 61.90% in observing group, higher than 57.14%, 28. 57% of control group (chi(2)=4.20 and 4.71, P<0.05). CONCLUSION Hepatic artery chemotherapeutic embolization combined with perfusing LAK cells/interleukin 2 into hepatic artery is an effective therapeutic method to control intrahepatic recurrence rates and raise the survival rates of the patients.
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Affiliation(s)
- L Xie
- The First Affiliated Hospital of Kunming Medical College, Kunming 650031, China
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Zhao Y, Chen Z, Saxer C, Xiang S, de Boer JF, Nelson JS. Phase-resolved optical coherence tomography and optical Doppler tomography for imaging blood flow in human skin with fast scanning speed and high velocity sensitivity. Opt Lett 2000; 25:114-6. [PMID: 18059800 DOI: 10.1364/ol.25.000114] [Citation(s) in RCA: 329] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
We have developed a novel phase-resolved optical coherence tomography (OCT) and optical Doppler tomography (ODT) system that uses phase information derived from a Hilbert transformation to image blood flow in human skin with fast scanning speed and high velocity sensitivity. Using the phase change between sequential scans to construct flow-velocity imaging, this technique decouples spatial resolution and velocity sensitivity in flow images and increases imaging speed by more than 2 orders of magnitude without compromising spatial resolution or velocity sensitivity. The minimum flow velocity that can be detected with an axial-line scanning speed of 400 Hz and an average phase change over eight sequential scans is as low as 10 microm/s, while a spatial resolution of 10 microm is maintained. Using this technique, we present what are to our knowledge the first phase-resolved OCT/ODT images of blood flow in human skin.
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Li G, Liu W, Yu X, Xiang S, Lin L, He H, Yu Q. [The development of Model Cihang-2000 mini multi-function electrocardiograph]. Zhongguo Yi Liao Qi Xie Za Zhi 1998; 22:133-136. [PMID: 12016780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The Model Cihang-2000 mini multi-function electrocardiograph is introduced in this paper. A lot of advanced electronic techniques and data processing techniques are used in this instrument. It is not only high in quality and small in size, but also strong in function.
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Abstract
A novel regulatory element (27 bp) which confers transcriptional repression was identified within the protein-coding region immediately after the translation start codon in the human cytochrome P450 (CYP) 2C9 gene. Deletion of this element increased transcriptional activity in HepG2 cells by transient transfection assay. Nuclear protein extracts from HepG2 cells and human liver were found in electrophoretic mobility shift assays to bind specifically to the 27 bp element. A putative binding protein was partially purified by DNA-affinity chromatography and was determined by Southwestern blotting to have a molecular weight of approx. 100 kDa. Studies with mutated competitor oligonucleotides established that binding of the nuclear protein to the 27 bp cis-element was dependent upon two 6 bp direct repeats (5'-CTTGTG-3') that were separated by three bases. It is possible that this novel cis-acting element may be involved in the negative regulation of CYP2C9.
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Affiliation(s)
- S Xiang
- Storr Liver Unit, Department of Medicine, University of Sydney, Westmead Hospital, Westmead, NSW 2145, Australia
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Bernstein JM, Ballow M, Xiang S, O'Neil K. Th1/Th2 cytokine profiles in the nasopharyngeal lymphoid tissues of children with recurrent otitis media. Ann Otol Rhinol Laryngol 1998; 107:22-7. [PMID: 9439384 DOI: 10.1177/000348949810700105] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The cytokine profile in adenoidal lymphoid tissue was studied in 22 patients. Lymphocytes from adenoid tissues and peripheral blood were submitted for cytokine assays using an enzyme-linked immunosorbent assay kit for interferon-gamma, interleukin (IL)-2, IL-4, IL-5, IL-6, and IL-10. Adenoidal lymphocytes appear to produce significantly less Th1 cytokines (IL-2, interferon gamma) compared to the patient's peripheral blood lymphocytes, whereas IL-4 and IL-5 (Th2 cytokines) appear to be synthesized to the same extent as, if not slightly more than, in the homologous peripheral blood lymphocytes. Because the relationship between Th1 and Th2 cytokines is extremely important in modulating the immune response, it is advisable to determine the role of the cytokine profiles of T-lymphocytes in the nasopharynx and its relationship to the development of inflammation of the eustachian tube and middle ear.
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Affiliation(s)
- J M Bernstein
- Department of Otolaryngology, Children's Hospital of Buffalo, State University of New York at Buffalo, USA
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