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European Journal of Endocrinology Mar 2017To investigate the differences in bone turnover between diabetic patients and controls. (Meta-Analysis)
Meta-Analysis Review
OBJECTIVE
To investigate the differences in bone turnover between diabetic patients and controls.
DESIGN
A systematic review and meta-analysis.
METHODS
A literature search was conducted using the databases Medline at PubMed and EMBASE. The free text search terms 'diabetes mellitus' and 'bone turnover', 'sclerostin', 'RANKL', 'osteoprotegerin', 'tartrate-resistant acid' and 'TRAP' were used. Studies were eligible if they investigated bone turnover markers in patients with diabetes compared with controls. Data were extracted by two reviewers.
RESULTS
A total of 2881 papers were identified of which 66 studies were included. Serum levels of the bone resorption marker C-terminal cross-linked telopeptide (-0.10 ng/mL (-0.12, -0.08)) and the bone formation markers osteocalcin (-2.51 ng/mL (-3.01, -2.01)) and procollagen type 1 amino terminal propeptide (-10.80 ng/mL (-12.83, -8.77)) were all lower in patients with diabetes compared with controls. Furthermore, s-tartrate-resistant acid phosphatase was decreased in patients with type 2 diabetes (-0.31 U/L (-0.56, -0.05)) compared with controls. S-sclerostin was significantly higher in patients with type 2 diabetes (14.92 pmol/L (3.12, 26.72)) and patients with type 1 diabetes (3.24 pmol/L (1.52, 4.96)) compared with controls. Also, s-osteoprotegerin was increased among patients with diabetes compared with controls (2.67 pmol/L (0.21, 5.14)).
CONCLUSIONS
Markers of both bone formation and bone resorption are decreased in patients with diabetes. This suggests that diabetes mellitus is a state of low bone turnover, which in turn may lead to more fragile bone. Altered levels of sclerostin and osteoprotegerin may be responsible for this.
Topics: Adaptor Proteins, Signal Transducing; Biomarkers; Bone Morphogenetic Proteins; Bone Remodeling; Case-Control Studies; Collagen Type II; Diabetes Mellitus, Type 1; Diabetes Mellitus, Type 2; Genetic Markers; Humans; Osteocalcin; Osteoprotegerin; Peptide Fragments; Procollagen; Tartrate-Resistant Acid Phosphatase
PubMed: 28049653
DOI: 10.1530/EJE-16-0652 -
Journal of Diabetes Research 2016Recent studies have shown the positive association between increased circulating BCAAs (valine, leucine, and isoleucine) and insulin resistance (IR) in obese or diabetic... (Review)
Review
Recent studies have shown the positive association between increased circulating BCAAs (valine, leucine, and isoleucine) and insulin resistance (IR) in obese or diabetic patients. However, results seem to be controversial in different races, diets, and distinct tissues. Our aims were to evaluate the relationship between BCAA and IR as well as later diabetes risk and explore the phenotypic and genetic factors influencing BCAA level based on available studies. We performed systematic review, searching MEDLINE, EMASE, ClinicalTrials.gov, the Cochrane Library, and Web of Science from inception to March 2016. After selection, 23 studies including 20,091 participants were included. Based on current evidence, we found that BCAA is a useful biomarker for early detection of IR and later diabetic risk. Factors influencing BCAA level can be divided into four parts: race, gender, dietary patterns, and gene variants. These factors might not only contribute to the elevated BCAA level but also show obvious associations with insulin resistance. Genes related to BCAA catabolism might serve as potential targets for the treatment of IR associated metabolic disorders. Moreover, these factors should be controlled properly during study design and data analysis. In the future, more large-scale studies with elaborate design addressing BCAA and IR are required.
Topics: 3-Methyl-2-Oxobutanoate Dehydrogenase (Lipoamide); Adaptor Proteins, Signal Transducing; Amino Acids, Branched-Chain; Diabetes Mellitus; Diet; Genotype; Humans; Insulin Resistance; Metabolome; Minor Histocompatibility Antigens; Obesity; Phenotype; Pregnancy Proteins; Protein Phosphatase 2C; Racial Groups; Sex Factors; Transaminases; Weight Loss
PubMed: 27642608
DOI: 10.1155/2016/2794591 -
Critical Reviews in Oncology/hematology May 2016The prognostic value of phosphatase and tensin homolog (PTEN) negativity in breast cancer has been evaluated by many studies but remains controversial. We conducted a... (Meta-Analysis)
Meta-Analysis Review
The prognostic value of phosphatase and tensin homolog (PTEN) negativity in breast cancer has been evaluated by many studies but remains controversial. We conducted a meta-analysis to assess the association of PTEN negativity with overall survival and disease-free survival. Thirty-two studies with 4393 patients were identified. PTEN negativity was significantly associated with unfavorable overall survival in breast cancer (hazard ratio=1.89, 95% confidence interval 1.58-2.26), with low heterogeneity among the studies (I(2)=25%, P=0.160) and no evidence for publication bias. Meta-analysis of multivariate hazard ratios and sensitivity analyses did not materially change the results. The data on disease-free survival was heterogeneous (I(2)=61.9%, P<0.001), with a summary hazard ratio of 1.57 (95% confidence interval 1.31-1.89). The exact source of heterogeneity remains unclear. We thus concluded that PTEN negativity was significantly associated with unfavorable prognosis in terms of overall survival in breast cancer.
Topics: Breast Neoplasms; Disease-Free Survival; Humans; Phosphoprotein Phosphatases; Prognosis; Tensins
PubMed: 26951995
DOI: 10.1016/j.critrevonc.2016.01.013 -
Journal of Endodontics Nov 2015Signaling molecules and responding dental pulp stem cells are the 2 main control keys of dentin regeneration/dentinogenesis. The aim of this study was to present a... (Review)
Review
INTRODUCTION
Signaling molecules and responding dental pulp stem cells are the 2 main control keys of dentin regeneration/dentinogenesis. The aim of this study was to present a systematic review investigating the gene expression of various dental pulp cells in response to different variants of tricalcium silicate cements.
METHODS
A systematic search of the literature was performed by 2 independent reviewers followed by article selection and data extraction. Studies analyzing all sorts of dental pulp cells (DPCs) and any variant of tricalcium silicate cement either as the experimental or as the control group were included.
RESULTS
A total of 39 articles were included in the review. Among the included studies, ProRoot MTA (Dentsply, Tulsa Dental, OK) was the most commonly used tricalcium silicate cement variant. The extracellular signal regulated kinase/mitogen-activated protein kinase pathway was the most commonly activated pathway to be identified, and similarly, dentin sialophosphoprotein osteocalcin dentin matrix acidic phosphoprotein 1, alkaline phosphatase, bone sialoprotein, osteopontin, type I collagen, and Runx2 were the most commonly expressed genes in that order of frequency.
CONCLUSIONS
Biodentine (Septodont Ltd, Saint Maur des Faussés, France), Bioaggregate (Innovative Bioceramix, Vancouver, BC, Canada), and mineral trioxide aggregate stimulate the osteogenic/odontogenic capacity of DPCs by proliferation, angiogenesis, and biomineralization through the activation of the extracellular signal regulated kinase ½, nuclear factor E2 related factor 2, p38, c-Jun N-terminal kinase mitogen-activated protein kinase, p42/p44 mitogen-activated protein kinase, nuclear factor kappa B, and fibroblast growth factor receptor pathways. When DPCs are placed into direct contact with tricalcium silicate cements, they show higher levels of gene activation, which in turn could translate into more effective pulpal repair and faster and more predictable formation of reparative dentin.
Topics: Calcium Compounds; Cell Proliferation; Cytokines; Dental Materials; Dental Pulp; Gene Expression Profiling; Humans; Osteogenesis; Silicates
PubMed: 26381895
DOI: 10.1016/j.joen.2015.07.015 -
Human Reproduction Update 2010Uterine contractile activity plays an important role in many and varied reproductive functions including sperm and embryo transport, implantation, menstruation,... (Review)
Review
BACKGROUND
Uterine contractile activity plays an important role in many and varied reproductive functions including sperm and embryo transport, implantation, menstruation, gestation and parturition. Abnormal contractility might underlie common and important disorders such as infertility, implantation failure, dysmenorrhea, endometriosis, spontaneous miscarriage or preterm birth.
METHODS
A systematic review of the US National Library of Medicine was performed linking 'uterus' or 'uterine myocyte' with 'calcium ion' (Ca(2+)), 'myosin light chain kinase' and 'myosin light chain phosphatase'. This led to many cross-references involving non-uterine myocytes and, where relevant, these data have been incorporated into the following synthesis.
RESULTS
We have grouped the data according to three main components that determine uterine contractility: the contractile apparatus; electrophysiology of the myocyte including excitation-contraction coupling; and regulation of the sensitivity of the contractile apparatus to Ca(2+). We also have included information regarding potential therapeutic methods for regulating uterine contractility.
CONCLUSIONS
More research is necessary to understand the mechanisms that generate the frequency, amplitude, duration and direction of propagation of uterine contractile activity. On the basis of current knowledge of the molecular control of uterine myocyte function, there are opportunities for systematic testing of the efficacy of a variety of available potential pharmacological agents and for the development of new agents. Taking advantage of these opportunities could result in an overall improvement in reproductive health.
Topics: Actin Cytoskeleton; Calcium Signaling; Electrophysiology; Female; Humans; Models, Biological; Myocytes, Smooth Muscle; Myometrium; Myosin-Light-Chain Kinase; Myosin-Light-Chain Phosphatase; Uterine Contraction; rho-Associated Kinases; rhoA GTP-Binding Protein
PubMed: 20551073
DOI: 10.1093/humupd/dmq016