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Collagen dysfunction

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https://www.readbyqxmd.com/read/28069497/a-modified-collagen-scaffold-facilitates-endogenous-neurogenesis-for-acute-spinal-cord-injury-repair
#1
Caixia Fan, Xing Li, Zhifeng Xiao, Yannan Zhao, Hui Liang, Bin Wang, Sufang Han, Xiaoran Li, Bai Xu, Nuo Wang, Sumei Liu, Weiwei Xue, Jianwu Dai
Due to irreversible neuronal loss and glial scar deposition, spinal cord injury (SCI) ultimately results in permanent neurological dysfunction. Neuronal regeneration of neural stem cells (NSCs) residing in the spinal cord could be an ideal strategy for replenishing the lost neurons and restore function. However, many myelin-associated inhibitors in the SCI microenvironment limit the ability of spinal cord NSCs to regenerate into neurons. Here, a linearly ordered collagen scaffold was used to prevent scar deposition, guide nerve regeneration and carry drugs to neutralize the inhibitory molecules...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28065360/intracavernous-injection-of-human-umbilical-cord-blood-mononuclear-cells-improves-erectile-dysfunction-in-streptozotocin-induced-diabetic-rats
#2
Tugba Cengiz, Ecem Kaya, Didem Yilmaz Oral, Isil Ozakca, Nur Bayatli, Arzu Zeynep Karabay, Tugba Altun Ensari, Tuna Karahan, Enis Yilmaz, Serap Gur
INTRODUCTION: Erectile dysfunction (ED) worsens in men with diabetes. Human umbilical cord blood (HUCB), because of its widespread availability and low immunogenicity, is a valuable source for stem cell-based therapies. AIM: To determine the effect of intracavernous injection of HUCB mononuclear cells (MNCs) on ED in rats with diabetes induced by streptozotocin. METHODS: Thirty adult male Sprague-Dawley rats were equally divided into three groups: (i) control, (ii) diabetes induced by streptozotocin (35 mg/kg intravenously for 8 weeks), and (iii) diabetic rats treated with MNCs (1 × 10(6) cells by intracavernosal injection)...
January 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28064474/the-effect-of-alcohol-administration-on-the-corpus-cavernosum
#3
See Min Choi, Deok Ha Seo, Sin Woo Lee, Chunwoo Lee, Seong Uk Jeh, Sung Chul Kam, Jeong Seok Hwa, Ky Hyun Chung, Jae Seog Hyun
PURPOSE: We studied the effects of alcohol administration on the corpus cavernosum (CC) using an animal model. MATERIALS AND METHODS: CC sections and the aortic ring of rabbits were used in an organ bath study. After acute alcohol administration, changes in blood alcohol concentration and electrical stimulation induced intracavernosal pressure/mean arterial pressure (ICP/MAP) percentage were compared in rats. Cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) levels in the CC were measured using immunoassays...
December 22, 2016: World Journal of Men's Health
https://www.readbyqxmd.com/read/28062404/endothelial-to-mesenchymal-transition-contributes-to-endothelial-dysfunction-and-dermal-fibrosis-in-systemic-sclerosis
#4
Mirko Manetti, Eloisa Romano, Irene Rosa, Serena Guiducci, Silvia Bellando-Randone, Amato De Paulis, Lidia Ibba-Manneschi, Marco Matucci-Cerinic
OBJECTIVE: Systemic sclerosis (SSc) features multiorgan fibrosis orchestrated predominantly by activated myofibroblasts. Endothelial-to-mesenchymal transition (EndoMT) is a transdifferentiation by which endothelial cells (ECs) lose their specific morphology/markers and acquire myofibroblast-like features. Here, we determined the possible contribution of EndoMT to the pathogenesis of dermal fibrosis in SSc and two mouse models. METHODS: Skin sections were immunostained for endothelial CD31 or vascular endothelial (VE)-cadherin in combination with α-smooth muscle actin (α-SMA) myofibroblast marker...
January 6, 2017: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/28056723/chronic-treatment-with-minoxidil-induces-elastic-fiber-neosynthesis-and-functional-improvement-in-the-aorta-of-aged-mice
#5
Marion Coquand-Gandit, Marie Paule Jacob, Wassim Fhayli, Beatriz Romero Ruiz de la Hermosa, Miglena Georgieva, Stéphanie Bouillot, Eric Estève, Jean-Pierre Andrieu, Sandrine Brasseur, Sophie Bouyon, Natalio Garcia-Honduvilla, Philippe Huber, Julia Bujan, Milena Atanasova, Gilles Faury
Normal arterial aging processes involve vascular cell dysfunction associated with wall stiffening, the latter being due to progressive elastin and elastic fiber degradation, as well as elastin and collagen cross-linking by advanced glycation end-products (AGE). These processes progressively lead to cardiovascular dysfunction during aging. Elastin is only synthesized during late gestation and childhood, and further degradation occurring throughout adulthood cannot be physiologically compensated by replacement of altered material...
January 5, 2017: Rejuvenation Research
https://www.readbyqxmd.com/read/28051771/proarrhythmic-remodelling-of-the-right-ventricle-in-a-porcine-model-of-repaired-tetralogy-of-fallot
#6
David Benoist, Virginie Dubes, François Roubertie, Stephen H Gilbert, Sabine Charron, Marion Constantin, Delphine Elbes, Delphine Vieillot, Bruno Quesson, Hubert Cochet, Michel Haïssaguerre, Caroline Rooryck, Pierre Bordachar, Jean-Benoit Thambo, Olivier Bernus
OBJECTIVE: The growing adult population with surgically corrected tetralogy of Fallot (TOF) is at risk of arrhythmias and sudden cardiac death. We sought to investigate the contribution of right ventricular (RV) structural and electrophysiological remodelling to arrhythmia generation in a preclinical animal model of repaired TOF (rTOF). METHODS AND RESULTS: Pigs mimicking rTOF underwent cardiac MRI functional characterisation and presented with pulmonary regurgitation, RV hypertrophy, dilatation and dysfunction compared with Sham-operated animals (Sham)...
October 8, 2016: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28051762/impact-of-long-term-high-fat-diet-intake-gestational-protein-restricted-offspring-on-kidney-morphology-and-function
#7
V H G Rizzi, L D B Sene, C D B Fernandez, J A R Gontijo, P A Boer
Emerging evidence highlights the far-reaching consequences of high-fat diet (HFD) and obesity on kidney morphological and functional disorders. In the present study, we aim to evaluate the effects of early HFD intake on renal function and morphology in maternal protein-restricted offspring (LP). LP and normal protein-intake offspring (NP) were fed HFD (LPH and NPH, respectively) or standard rodent (LPN and NPN) diet from the 8th to 13th week of age. Blood pressure, kidney function, immunohistochemistry and scanning electron microscopy were analyzed...
February 2017: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/28049736/glp-1-analogue-induced-weight-loss-does-not-improve-obesity-induced-at-dysfunction
#8
Emilie Pastel, Laura J McCulloch, Rebecca Ward, Shivam Joshi, Kim M Gooding, Angela C Shore, Katarina Kos
Glucagon-like peptide-1 (GLP-1) analogues aid weight loss which improves obesity-associated adipose tissue (AT) dysfunction. GLP-1 treatment may however also directly influence AT which expresses GLP-1 receptors. This study aimed to assess the impact of GLP-1 analogue treatment on subcutaneous AT inflammatory and fibrotic responses, compared to weight loss by calorie reduction (control). Among the 39 participants with type 2 diabetes recruited, 30 age-matched participants were randomised to 4 months treatment with Liraglutide (n=22) or calorie restriction-based on dietetic counselling (n=8)...
January 3, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28049497/two-differentially-structured-collagen-scaffolds-for-potential-urinary-bladder-augmentation-proof-of-concept-study-in-a-g%C3%A3-ttingen-minipig-model
#9
Dorothea Leonhäuser, Katja Stollenwerk, Volker Seifarth, Isabella M Zraik, Michael Vogt, Pramod K Srinivasan, Rene H Tolba, Joachim O Grosse
BACKGROUND: The repair of urinary bladder tissue is a necessity for tissue loss due to cancer, trauma, or congenital abnormalities. Use of intestinal tissue is still the gold standard in the urological clinic, which leads to new problems and dysfunctions like mucus production, stone formation, and finally malignancies. Therefore, the use of artificial, biologically derived materials is a promising step towards the augmentation of this specialised tissue. The aim of this study was to investigate potential bladder wall repair by two collagen scaffold prototypes, OptiMaix 2D and 3D, naïve and seeded with autologous vesical cells, as potential bladder wall substitute material in a large animal model...
January 4, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28049007/cellular-aging-towards-osteoarthritis
#10
REVIEW
Yu-Sheng Li, Wen-Feng Xiao, Wei Luo
Osteoarthritis (OA) is a common form of degenerative joint disease. Aging process is supposed to be a leading predictor for developing OA. In this review, we have discussed the potential roles of aging in OA, a better understanding of which might delay or stop the development and progression of OA. Different cellular signaling mechanisms are involved process of aging that induces age-related changes in chondrocytes. These changes influence the expression of catabolic factors resulting in increased production of matrix metalloproteinases and cytokines, reduced levels of collagen type II and aggrecan synthesis, and increased production of reactive oxygen species (ROS)...
December 31, 2016: Mechanisms of Ageing and Development
https://www.readbyqxmd.com/read/28042617/temporary-systemic-inhibition-of-the-wnt-%C3%AE-catenin-pathway-promotes-regenerative-cardiac-repair-following-myocardial-infarct
#11
Dikshya Bastakoty, Sarika Saraswati, Piyush Joshi, James Atkinson, Igor Feoktistov, Jun Liu, Jennifer L Harris, Pampee P Young
AIMS: The WNT/β-catenin pathway is temporarily activated in the heart following myocardial infarction (MI). Despite data from genetic models indicating both positive and negative roles for the WNT pathway depending on the model used, the effect of therapeutic inhibition of WNT pathway on post-injury outcome and the cellular mediators involved are not completely understood. Using a newly available, small molecule, GNF-6231, which averts WNT pathway activation by blocking secretion of all WNT ligands, we sought to investigate whether therapeutic inhibition of the WNT pathway temporarily after infarct can mitigate post injury cardiac dysfunction and fibrosis and the cellular mechanisms responsible for the effects...
November 2016: Cell Stem Cells Regen Med
https://www.readbyqxmd.com/read/28031479/peptidylarginine-deiminase-4-promotes-age-related-organ-fibrosis
#12
Kimberly Martinod, Thilo Witsch, Luise Erpenbeck, Alexander Savchenko, Hideki Hayashi, Deya Cherpokova, Maureen Gallant, Maximilian Mauler, Stephen M Cifuni, Denisa D Wagner
Aging promotes inflammation, a process contributing to fibrosis and decline in organ function. The release of neutrophil extracellular traps (NETs [NETosis]), orchestrated by peptidylarginine deiminase 4 (PAD4), damages organs in acute inflammatory models. We determined that NETosis is more prevalent in aged mice and investigated the role of PAD4/NETs in age-related organ fibrosis. Reduction in fibrosis was seen in the hearts and lungs of aged PAD4(-/-) mice compared with wild-type (WT) mice. An increase in left ventricular interstitial collagen deposition and a decline in systolic and diastolic function were present only in WT mice, and not in PAD4(-/-) mice...
December 28, 2016: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28030486/non-human-primate-model-of-poly-traumatic-hemorrhagic-shock-recapitulates-early-platelet-dysfunction-observed-following-severe-injury-in-humans
#13
Leasha J Schaub, Hunter B Moore, Andrew P Cap, Jacob J Glaser, Ernest E Moore, Forest R Sheppard
BACKGROUND: Platelet dysfunction has been described as an early component of trauma induced coagulopathy (TIC). The platelet component of TIC remains to be fully elucidated and translatable animal models are required to facilitate mechanistic investigations. We sought to determine if the early platelet dysfunction described in trauma patients could be recapitulated in an non-human primate (NHP) model of poly-traumatic hemorrhagic shock. METHODS: Twenty-four male Rhesus Macaques weighting 7-14 kilograms were subjected to 60 minutes (min) severe pressure-targeted controlled hemorrhagic shock (HS) with and without other injuries...
December 23, 2016: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28026135/protective-effects-of-trans-caryophyllene-on-maintaining-osteoblast-function
#14
Jinghua Shan, Lixia Chen, Keliang Lu
Age-related osteoblast dysfunction is the main cause of age-related bone loss. Trans-caryophyllene (TC) is an important constituent of the essential oils derived from several species of medicinal plants. In this study, we investigated the effects of TC on osteoblast function in osteoblastic MC3T3-E1 cells. The results indicate that TC caused a significant elevation in collagen content, alkaline phosphatase activity, osteocalcin production, and mineralization, which are the four markers that account for the various stages of osteoblastic differentiation...
January 2017: IUBMB Life
https://www.readbyqxmd.com/read/28024102/elevated-ischaemia-associated-lysyl-oxidase-activity-in-delayed-graft-failure-6-12%C3%A2-months-after-renal-transplantation
#15
Zhi Chen, Yiyang Li, Hongmei Xu, Fuzhe Ma, Jia Li, Lei Zhao, Ying Xu
What is the central question of this study? What potential biochemical changes are associated with renal parenchyma 6-12 months after renal transplantation and delayed graft failure? What is the main finding and its importance? Tissue fibrosis, mediated by tissue ischaemia-induced induction of hypoxia-inducible factor-1α and fibronectin and consequent activation of lysyl oxidase, is a major underlying pathophysiological mechanism that contributes to delayed graft failure several months after renal transplantation...
November 7, 2016: Experimental Physiology
https://www.readbyqxmd.com/read/28017832/autosomal-recessive-keratoderma-ichthyosis-deafness-arkid-syndrome-is-caused-by-vps33b-mutations-affecting-rab-protein-interaction-and-collagen-modification
#16
Robert Gruber, Clare Rogerson, Christian Windpassinger, Blerida Banushi, Anna Straatman-Iwanowska, Joanna Hanley, Federico Forneris, Robert Strohal, Peter Ulz, Debra Crumrine, Gopinathan K Menon, Stefan Blunder, Matthias Schmuth, Thomas Müller, Holly Smith, Kevin Mills, Peter Kroisel, Andreas R Janecke, Paul Gissen
Here we report three patients with severe palmoplantar keratoderma associated with ichthyosis and sensorineural deafness. Bi-allelic mutations were found in VPS33B, encoding VPS33B, a Sec1/Munc18 family protein which interacts with Rab11a and Rab25 proteins and is involved in trafficking of the collagen modifying enzyme LH3. Two patients were homozygous for the missense variant p.Gly131Glu, whilst one patient was compound heterozygous for p.Gly131Glu and the splice site mutation c.240-1G>C, previously reported in patients with Arthrogryposis Renal dysfunction and Cholestasis syndrome...
December 22, 2016: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28007558/aryl-hydrocarbon-receptor-suppresses-the-osteogenesis-of-mesenchymal-stem-cells-in-collagen-induced-arthritic-mice-through-the-inhibition-of-%C3%AE-catenin
#17
Yulong Tong, Menglin Niu, Yuxuan Du, Wentong Mei, Wei Cao, Yunpeng Dou, Haitao Yu, Xiaonan Du, Huihui Yuan, Wenming Zhao
The contributions of aryl hydrocarbon receptor (Ahr) to the pathogenesis of rheumatoid arthritis (RA), particularly bone loss, have not been clearly explored. The imbalance between osteoblasts and osteoclasts is a major reason for bone loss. The dysfunction of osteoblasts, which are derived from mesenchymal stem cells (MSCs), induced bone erosion occurs earlier and is characterized as more insidious. Here, we showed that the nuclear expression and translocation of Ahr were both significantly increased in MSCs from collagen-induced arthritis (CIA) mice...
December 20, 2016: Experimental Cell Research
https://www.readbyqxmd.com/read/28006767/a-2-year-longitudinal-prospective-study-of-the-effects-of-eltrombopag-on-bone-marrow-in-patients-with-chronic-immune-thrombocytopenia
#18
Russell K Brynes, Raymond S M Wong, Maung M Thein, Kalpana K Bakshi, Paul Burgess, Dickens Theodore, Attilio Orazi
BACKGROUND: The long-term effects of eltrombopag on bone marrow (BM) reticulin and/or collagen deposition in previously treated adults with chronic immune thrombocytopenia (ITP) were assessed. METHODS: Three BM biopsies were collected at baseline and after 1 and 2 years of eltrombopag treatment. Specimens were centrally processed, stained for reticulin and collagen, independently reviewed by 2 hematopathologists, and rated according to the European Consensus 0-3 scale of marrow fibrosis (MF)...
December 23, 2016: Acta Haematologica
https://www.readbyqxmd.com/read/28005398/the-paracrine-effect-of-degenerated-disc-cells-on-healthy-human-nucleus-pulposus-cells-is-mediated-by-mapk-and-nf-%C3%AE%C2%BAb-pathways-and-can-be-reduced-by-tgf-%C3%AE-1
#19
Feng Cai, Lei Zhu, Feng Wang, Rui Shi, Xin-Hui Xie, Xin Hong, Xiao-Hu Wang, Xiao-Tao Wu
Inflammation is thought to have a major role in the pathogenesis of disc degeneration. Studies have shown that nucleus pulposus cells (NPCs) respond to one or two specific cytokines by regulating cell proliferation or matrix synthesis. However, the effects of a cocktail of factors secreted by degenerated disc cells on transplanted exogenous healthy NPCs remain unknown. Concentrations of multiple cytokines in degenerated disc tissue-conditioned medium (dCM) were measured using enzyme-linked immunosorbent assay (ELISA)...
December 22, 2016: DNA and Cell Biology
https://www.readbyqxmd.com/read/28000916/pathological-changes-of-adipose-tissue-in-secondary-lymphedema
#20
K Tashiro, J Feng, S-H Wu, T Mashiko, K Kanayama, M Narushima, H Uda, S Miyamoto, I Koshima, K Yoshimura
BACKGROUND: The pathophysiology of lymphedema is poorly understood. Current treatment options include compression therapy, resection, liposuction, and lymphatic microsurgery, but determining the optimal treatment approach for each patient remains challenging. OBJECTIVES: We characterized skin and adipose tissue alterations in the setting of secondary lymphedema. METHODS: Morphologic and histopathologic evaluations were conducted for 70 specimens collected from 26 female patients with lower extremity secondary lymphedema following surgical intervention for gynecologic cancers...
December 21, 2016: British Journal of Dermatology
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