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Type 2 collagen

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https://www.readbyqxmd.com/read/28211947/insulin-like-growth-factor-1-promotes-osteogenic-differentiation-and-collagen-i-alpha-2-synthesis-via-induction-of-mrna-binding-protein-larp6-expression
#1
Yue Guo, Chen-Yi Tang, Xiao-Fei Man, Hao-Neng Tang, Jun Tang, Ci-La Zhou, Shu-Wen Tan, Min Wang, Yun-Zhi Feng, Hou-De Zhou
This study explored the mechanism underlying the stimulation of collagen synthesis and osteoblastic differentiation by insulin-like growth factor 1 (IGF1) in primary mouse osteoblasts. Primary mouse calvarial osteoblasts were cultured and treated with various doses of IGF1 before transfection with siRNA targeting the collagen type I alpha 2 (Col1a2) or La ribonucleoprotein domain family member 6 (Larp6) genes. Alkaline phosphatase (ALP) activity, osteocalcin staining, alizarin red quantification and the expression level of runt-related transcription factor 2 (RUNX2) were performed to assess the differentiation of pre-osteoblasts...
February 17, 2017: Development, Growth & Differentiation
https://www.readbyqxmd.com/read/28210626/osteogenic-differentiation-capacity-of-in-vitro-cultured-human-skeletal-muscle-for-expedited-bone-tissue-engineering
#2
Chunlei Miao, Lulu Zhou, Lufeng Tian, Yingjie Zhang, Wei Zhang, Fanghong Yang, Tianyi Liu, Shengjian Tang, Fangjun Liu
Expedited bone tissue engineering employs the biological stimuli to harness the intrinsic regenerative potential of skeletal muscle to trigger the reparative process in situ to improve or replace biological functions. When genetically modified with adenovirus mediated BMP2 gene transfer, muscle biopsies from animals have demonstrated success in regenerating bone within rat bony defects. However, it is uncertain whether the human adult skeletal muscle displays an osteogenic potential in vitro when a suitable biological trigger is applied...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28209710/a-model-for-the-conformational-activation-of-the-structurally-quiescent-metalloprotease-adamts13-by-von-willebrand-factor
#3
Kieron South, Marta O Freitas, David A Lane
Blood loss is prevented by the multi-domain glycoprotein von Willebrand factor (VWF), which binds exposed collagen at damaged vessels and captures platelets. VWF is regulated by the metalloprotease ADAMTS13, which, in turn, is conformationally activated by VWF. To delineate the structural requirements for VWF-mediated conformational activation of ADAMTS13, we performed binding and functional studies with a panel of truncated ADAMTS13 variants. We demonstrate that both the isolated CUB1 and CUB2 domains in ADAMTS13 bind to the spacer domain exosite of a truncated ADAMTS13 variant, MDTCS (KD of 135 ± 10...
February 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28206698/fkbp10-deletion-in-osteoblasts-leads-to-qualitative-defects-in-bone
#4
Caressa D Lietman, Joohyun Lim, Ingo Grafe, Yuqing Chen, Hao Ding, Xiaohong Bi, Catherine G Ambrose, Nadja Fratzl-Zelman, Paul Roschger, Klaus Klaushofer, Wolfgang Wagermaier, Ingo Schmidt, Peter Fratzl, Jyoti Rai, MaryAnn Weis, David Eyre, Douglas R Keene, Deborah Krakow, Brendan H Lee
Osteogenesis Imperfecta (OI), also known as brittle bone disease, displays a spectrum of clinical severity from mild (OI type I) to severe early lethality (OI type II), with clinical features including low bone mass, fractures and deformities. Mutations in the FK506 Binding Protein 10 (FKBP10), gene encoding the 65KDa protein FKBP65, cause a recessive form of OI and Bruck syndrome, the latter being characterized by joint contractures in addition to low bone mass. We previously showed that Fkbp10 expression is limited to bone, tendon and ligaments in postnatal tissues...
February 16, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28202394/platelet-rich-plasma-prp-induces-chondroprotection-via-increasing-autophagy-anti-inflammatory-markers-and-decreasing-apoptosis-in-human-osteoarthritic-cartilage
#5
Mayssam Moussa, Daniel Lajeunesse, George Hilal, Oula El Atat, Gaby Haykal, Rim Serhal, Antonio Chalhoub, Charbel Khalil, Nada Alaaeddine
OBJECTIVES: Autophagy constitutes a defense mechanism to overcome aging and apoptosis in osteoarthritic cartilage. Several cytokines and transcription factors are linked to autophagy and play an important role in the degradative cascade in osteoarthritis (OA). Cell therapy such as platelet rich plasma (PRP) has recently emerged as a promising therapeutic tool for many diseases including OA. However, its mechanism of action on improving cartilage repair remains to be determined. The purpose of this study is to investigate the effect of PRP on osteoarthritic chondrocytes and to elucidate the mechanism by which PRP contributes to cartilage regeneration...
February 12, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28199387/dermatan-sulfate-is-a-player-in-the-transglutaminase-2-interaction-network
#6
Grzegorz Wisowski, Ewa M Koźma, Tomasz Bielecki, Adam Pudełko, Krystyna Olczyk
Transglutaminase 2 (TG2) is a multifunctional protein that is primarily engaged in cell adhesion/signaling or shows Ca2+-dependent transglutaminase activity in the extracellular space of tissues. This latter action leads to the cross-linking of the extracellular matrix (ECM) proteins. The enhanced extracellular expression of TG2 is associated with processes such as wound healing, fibrosis or vascular remodeling that are also characterized by a high deposition of dermatan sulfate (DS) proteoglycans in the ECM...
2017: PloS One
https://www.readbyqxmd.com/read/28197741/correlation-between-the-col4a3-mmp-9-and-timp-1-polymorphisms-and-risk-of-keratoconus
#7
Ramin Saravani, Davood Yari, Samira Saravani, Farzaneh Hasanian-Langroudi
PURPOSE: Keratoconus (KC) is thinning of the central cornea. Its etiology is unknown, but it may result from degrading of collagen type IV. The major protein in the cornea is collagen. Matrix metalloproteinase-9 (MMP-9) is able to degrade collagen type IV from the basement membrane and extracellular matrix (ECM). MMP-9 enzymatic activity is inhibited by the tissue inhibitor of metalloproteinase-1 (TIMP-1). In the present study, we sought to investigate and evaluate the effects of single nucleotide polymorphisms in COL4A3, MMP-9, and TIMP-1 on the risk of KC in an Iranian population sample...
February 14, 2017: Japanese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28196866/sglt2-expression-is-increased-in-human-diabetic-nephropathy-sglt2-inhibition-decreases-renal-lipid-accumulation-inflammation-and-the-development-of-nephropathy-in-diabetic-mice
#8
Xiaoxin X Wang, Jonathan Levi, Yuhuan Luo, Komuraiah Myakala, Michal Herman-Edelstein, Liru Qiu, Dong Wang, Yingqiong Peng, Almut Grenz, Scott Lucia, Evgenia Dobrinskikh, Vivette D D'Agati, Hermann Koepsell, Jeffrey B Kopp, Avi Rosenberg, Moshe Levi
There is very limited human renal sodium gradient dependent glucose transporter protein SGLT2 mRNA and protein expression data reported in the literature. Aim 1 of this study was to determine SGLT2 mRNA and protein levels in human and animal models of diabetic nephropathy. We have found that the expression of SGLT2 mRNA and protein is increased in renal biopsies from human subjects with diabetic nephropathy. This is in contrast to db-db mice which had no changes in renal SGLT-2 protein expression. Furthermore, the effect of SGLT2 inhibition on renal lipid content and inflammation is not known...
February 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28196225/blood-vessel-basement-membrane-alterations-in-human-retinal-microaneurysms-during-aging
#9
Mariana López-Luppo, Victor Nacher, David Ramos, Joana Catita, Marc Navarro, Ana Carretero, Alfonso Rodriguez-Baeza, Luísa Mendes-Jorge, Jesús Ruberte
Purpose: Microaneurysms, considered a hallmark of retinal vascular disease, are present in aged retinas. Here, the basement membrane of human retinal microaneurysms has been analyzed during aging. Methods: Retinas were obtained from 17 nondiabetic donors. Whole mount retinas and paraffin sections were marked immunohistochemically with antibodies against the main components of the blood basement membrane. Trypsin digestion and transmission electron microscopy also were performed...
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28195085/histological-evaluation-of-the-possible-transformation-of-peripheral-giant-cell-granuloma-and-peripheral-ossifying-fibroma-a-preliminary-study
#10
Ömür Dereci, Şivge Akgün, Bülent Celasun, Adnan Öztürk, Ömer Günhan
AIMS: The objective of this study is to describe shared morphological features of peripheral giant cell granuloma (PGCG) and peripheral ossifying fibroma (POF) in detail and discuss the possible relationship between them. MATERIALS AND METHODS: Ten intermediate cases with features resembling to both POF and PGCG were selected and type 3 and 1 collagen immunostainings were performed for evaluation of the connective tissue maturation. Immunohistochemical staining percentage (SP) for stromal cells in the slides of POF and PGCG counterparts of intermediate lesions was scored as 1 when the SP was above 10%, 2 when the SP was above 25%, 3 when the SP was above 50% and 4 when the SP was above 75%...
January 2017: Indian Journal of Pathology & Microbiology
https://www.readbyqxmd.com/read/28188756/therapeutic-effect-and-mechanism-of-electrical-stimulation-in-female-stress-urinary-incontinence
#11
Jie Min, Bingshu Li, Cheng Liu, Shasha Hong, Jianming Tang, Ming Hu, Yaodan Liu, Suting Li, Li Hong
OBJECTIVE: To investigate the therapeutic effect and underlying molecular mechanism of electrical stimulation (ES) in a murine SUI model. MATERIALS AND METHODS: Sixty female C57BL/6 mice were divided into four groups: CON group, no intervention; VD group, vaginal distension (VD) with an 8-mm dilator for 1 h; VD+ES 20 group, 20 Hz ES for 0.5 h for 7 days after VD; VD+ES 50 group, 50 Hz ES for 7 days after VD. For functional studies, assessments of urodynamics and sneezing test were performed; then, anterior vaginal wall specimens were collected...
February 7, 2017: Urology
https://www.readbyqxmd.com/read/28186995/microrna-214-regulates-smooth-muscle-cell-differentiation-from-stem-cells-by-targeting-rna-binding-protein-qki
#12
Yutao Wu, Zhoubin Li, Mei Yang, Bing Dai, Feng Hu, Feng Yang, Jianhua Zhu, Ting Chen, Li Zhang
MicroRNA-214(miR-214) has been recently reported to regulate angiogenesis and embryonic stem cells (ESCs) differentiation. However, very little is known about its functional role in vascular smooth muscle cells (VSMCs) differentiation from ESCs. In the present study, we assessed the hypothesis that miR-214 and its target genes play an important role in VSMCs differentiation. Murine ESCs were seeded on collagen-coated flasks and cultured in differentiation medium for 2 to 8 days to allow VSMCs differentiation...
February 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28183637/surface-modification-of-tio2-nanotubes-with-osteogenic-growth-peptide-to-enhance-osteoblast-differentiation
#13
Min Lai, Ziyang Jin, Zhiguo Su
To investigate the influence of surface-biofunctionalized substrates on osteoblast behavior, a layer of aligned TiO2 nanotubes with a diameter of around 70nm was fabricated on titanium surface by anodization, and then osteogenic growth peptide (OGP) was conjugated onto TiO2 nanotubes through the intermediate layer of polydopamine. The morphology, composition and wettability of different surfaces were characterized by field-emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and contact angle measurements, respectively...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28180919/pathophysiology-of-bone-fragility-in-patients-with-diabetes
#14
REVIEW
Andrea Palermo, Luca D'Onofrio, Raffaella Buzzetti, Silvia Manfrini, Nicola Napoli
It has been well established that bone fragility is one of the chronic complications of diabetes mellitus, and both type 1 and type 2 diabetes are risk factors for fragility fractures. Diabetes may negatively affect bone health by unbalancing several pathways: bone formation, bone resorption, collagen formation, inflammatory cytokine, muscular and incretin system, bone marrow adiposity and calcium metabolism. The purpose of this narrative review is to explore the current understanding of pathophysiological pathways underlying bone fragility in diabetics...
February 8, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28179160/tubular-collagen-scaffolds-with-radial-elasticity-for-hollow-organ-regeneration
#15
Luuk R Versteegden, Kenny A van Kampen, Heinz P Janke, Dorien M Tiemessen, Theo G Hafmans, Edwin A Roozen, Roger M Lomme, Harry van Goor, Egbert Oosterwijk, Wout F Feitz, Toin H van Kuppevelt, Willeke F Daamen
: Tubular collagen scaffolds have been used for the repair of damaged hollow organs in regenerative medicine, but they generally lack the ability to reversibly expand in radial direction, a physiological characteristic seen in many native tubular organs. In this study, tubular collagen scaffolds were prepared that display a shape recovery effect and therefore exhibit radial elasticity. Scaffolds were constructed by compression of fibrillar collagen around a star-shaped mandrel, mimicking folds in a lumen, a typical characteristic of empty tubular hollow organs, such as ureter or urethra...
February 5, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28178186/exogenous-pthrp-repairs-the-damaged-fracture-healing-of-pthrp-mice-and-accelerates-fracture-healing-of-wild-mice
#16
Yinhe Wang, Xin Fang, Chun Wang, Congzhu Ding, Hua Lin, Anlong Liu, Lei Wang, Yang Cao
Bone fracture healing is a complicated physiological regenerative process initiated in response to injury and is similar to bone development. To demonstrate whether an exogenous supply of parathyroid hormone-related protein (PTHrP) helps in bone fracture healing, closed mid-diaphyseal femur fractures were created and stabilized with intramedullary pins in eight-week-old wild-type (WT) PTHrP+/+ and PTHrP+/- mice. After administering PTHrP for two weeks, callus tissue properties were analyzed at one, two, and four weeks post-fracture (PF) by various methods...
February 6, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28177155/a-chaperone-complex-formed-by-hsp47-fkbp65-and-bip-modulates-telopeptide-lysyl-hydroxylation-of-type-i-procollagen
#17
Ivan Duran, Jorge H Martin, Mary Ann Weis, Pavel Krejci, Peter Konik, Bing Li, Yasemin Alanay, Caressa Lietman, Brendan Lee, David Eyre, Daniel H Cohn, Deborah Krakow
Lysine hydroxylation of type I collagen telopeptides varies from tissue to tissue and these distinct hydroxylation patterns modulate collagen crosslinking to generate a unique extracellular matrix. Abnormalities in these patterns contribute to pathologies that include osteogenesis imperfecta (OI), fibrosis and cancer. Telopeptide procollagen modifications are carried out by lysyl hydroxylase 2 (LH2), however, little is known regarding how this enzyme regulates hydroxylation patterns. We identified an ER complex of resident chaperones that includes HSP47, FKBP65 and BiP regulating the activity of LH2...
February 8, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28162947/fty720-supplementation-partially-improves-erectile-dysfunction-in-rats-with-streptozotocin-induced-type-1-diabetes-through-inhibition-of-endothelial-dysfunction-and-corporal-fibrosis
#18
Kai Cui, Yajun Ruan, Tao Wang, Ke Rao, Zhong Chen, Shaogang Wang, Jihong Liu
INTRODUCTION: Erectile dysfunction (ED) in patients with diabetes mellitus (DM) seriously affects their quality of life. However, these patients show a poor effect rate for oral phosphodiesterase type 5 inhibitors. Thus, new treatment methods are urgently needed. Fingolimod hydrochloride (FTY720) was approved in 2010 for the treatment of patients with the relapsing-remitting form of multiple sclerosis. AIM: To investigate whether FTY720 supplementation could ameliorate ED induced by DM (DMED)...
February 2, 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28162174/-viability-of-osteoblasts-under-cell-hypoxia-condition
#19
C Wu, W W Zheng, M Yang
Objective: To investigate the effects of hypoxia condition and hypoxia-reoxygenation condition on the cell viability, apoptosis rate and gene expression of osteoblasts cultured in vitro. Methods: The cranium osteoblasts from newborn Sprague Dawley rats within 48 hours were cultured and purified through tissue block method.The morphological changes of cells were evaluated by the Alizarin Red S staining and Alkaline phosphatase staining.The third-generation osteoblasts were cultured in normal condition for 36 hours (group A), in hypoxic condition for 24hours (group B), in hypoxic condition for 24hours thereafter reoxygenated for 12 hours (group D), in hypoxic condition for 36 hours (group C)...
January 17, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28161589/women-with-type-2-diabetes-mellitus-have-lower-cortical-porosity-of-the-proximal-femoral-shaft-using-low-resolution-ct-than-nondiabetic-women-and-increasing-glucose-is-associated-with-reduced-cortical-porosity
#20
Marit Osima, Rita Kral, Tove T Borgen, Ingvild K Høgestøl, Ragnar M Joakimsen, Erik F Eriksen, Åshild Bjørnerem
Increased cortical porosity has been suggested as a possible factor increasing fracture propensity in patients with type 2 diabetes mellitus (T2DM). This is a paradox because cortical porosity is generally associated with high bone turnover, while bone turnover is reduced in patients with T2DM. We therefore wanted to test the hypothesis that women with T2DM have lower bone turnover markers (BTM) and lower cortical porosity than those without diabetes, and that higher serum glucose and body mass index (BMI) are associated with lower BTM, and with lower cortical porosity...
February 1, 2017: Bone
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