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Collagen AND PRP

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https://www.readbyqxmd.com/read/29130636/efficacy-of-subcutaneous-injection-of-platelet-rich-plasma-in-alopecia-a-clinical-and-histological-pilot-study-on-a-rat-model-with-a-six-month-long-term-follow-up-experience
#1
Sophie Orliac, Jean-Michel Serfaty, Anne Perozziello, Olivier Zurlinden, Liliane Louedec, Benjamin Dallaudière
PURPOSE: To assess the potential of platelet-rich plasma (PRP) subcutaneous injection of to treat alopecia and to evaluate local toxicity. MATERIALS-METHODS: Twelve Hairless rats were used. At D0, we performed systematic clinical examination and divided the rat back into four quadrants (Q). We initiated subcutaneous injection using either PRP in PRPQ+, platelet-poor plasma (PPP) in PPPQ+, physiological serum (PS) in PSQ+, or no treatment (Q4). At D7, D14, D21, and D28 but also second month (M2), M3, M4, M5, rats had exactly the same injection procedure...
November 11, 2017: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/29122407/three-dimensional-poly-lactic-co-glycolic-acid-scaffold-containing-autologous-platelet-rich-plasma-supports-keloid-fibroblast-growth-and-contributes-to-keloid-formation-in-a-nude-mouse-model
#2
Chunlin Chen, Haibin Wang, Guozhang Zhu, Zhongsheng Sun, Xiang Xu, Fangwei Li, Shengkang Luo
BACKGROUND: There is a lack of proper animal models to study keloid formation. AIM: To create three-dimensional poly lactic-co-glycolic acid (PLGA) scaffolds containing autologous platelet-rich plasma (PRP) as an in vitro culture environment for keloid fibroblasts (KL), and to study their implantation into nude mice to mimic the process of keloid formation. METHODS: Normal fibroblasts (FB) and KL cells were isolated from surgical specimens and transduced with lentivirus loaded with green fluorescent protein (GFP) and luciferase genes...
October 26, 2017: Journal of Dermatological Science
https://www.readbyqxmd.com/read/29040421/effect-of-use-of-platelet-rich-plasma-prp-in-skin-with-intrinsic-aging-process
#3
Luiz Charles-de-Sá, Natale Ferreira Gontijo-de-Amorim, Christina Maeda Takiya, Radovan Borojevic, Donatella Benati, Paolo Bernardi, Andrea Sbarbati, Gino Rigotti
Background: In previous papers, we demonstrated that the treatment of human photoaged skin with stromal-vascular fraction-enriched fat or expanded adipose-derived stem cells showed a decrease of elastosis and the appearance of new oxytalan elastic fibers in dermis and an increase in the vascular network. The utilization of fat plus platelet-rich plasma (PRP) led to an increase in the vascular permeability and reactivity of the nervous component. Objectives: The purpose of this study was to analyze the histologic and ultrastructural changes of human skin after the injection of only PRP in the retroauricular area that was not exposed to sun and did not present the photoaging process, in comparison with our previous results...
September 7, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/29026811/the-use-of-platelet-rich-plasma-for-storage-of-surplus-harvested-skin-grafts
#4
Ilknur Keskin, Nilufer Ayturk, Mustafa Sutcu, Mustafa Keskin, Tangul Mudok
BACKGROUND: There is a need for improved methods and storage media to sustain the tissue viability of autologous skin grafts. OBJECTIVE: To compare histological changes in human skin grafts stored in platelet-rich plasma (PRP) with those of grafts stored in saline. METHODS: Eight circular, 3-mm full-thickness skin graft samples were harvested from the abdominal skin of each of 5 patients scheduled to undergo an abdominoplasty procedure. Four of these graft samples were stored in saline, and the other 4 were stored in saline mixed with PRP prepared from the patient's own venous blood...
February 2017: Plastic Surgery
https://www.readbyqxmd.com/read/29022492/platelet-aggregation-impacts-thrombin-generation-assessed-by-calibrated-automated-thrombography
#5
Mélusine Didelot, Clémence Docq, Denis Wahl, Patrick Lacolley, Véronique Regnault, Jérémy Lagrange
A calibrated automated thrombogram (CAT) is performed usually with human platelet-free plasma (PFP) but may be more relevant with platelet-rich plasma (PRP). In this case, platelets are not stimulated by subendothelial molecules like collagen. Our aim was to assess the consequence of strong (collagen) or weak (ADP) induction of platelet release and aggregation on thrombin generation. Platelet aggregation in PRP was triggered with 10 µg/mL collagen or 10 µM ADP using a lumi-aggregometer. Thrombin generation curves were monitored by CAT in different conditions: PRP, PRP with activated platelets (actPRP), aggregated PRP (agPRP), aggregated platelets resuspended in autologous PFP (resPRP), PFP and PFP obtained after aggregation (agPFP)...
October 12, 2017: Platelets
https://www.readbyqxmd.com/read/28981200/soluble-fibrin-causes-an-acquired-platelet-glycoprotein-vi-signaling-defect-implications-for-coagulopathy
#6
M Y Lee, C C Verni, B A Herbig, S L Diamond
Essentials Collagen and thrombin when used simultaneously generate highly activated platelets. The effect of thrombin stimulation on subsequent glycoprotein VI (GPVI) function was observed. Soluble fibrin, but not protease activated receptor (PAR) activation, prevented GPVI activation. Circulating soluble fibrin in coagulopathic blood may cause an acquired GPVI signaling defect. SUMMARY: Background In coagulopathic blood, circulating thrombin may drive platelet dysfunction. Methods/Results Using calcium dye-loaded platelets, the effect of thrombin exposure and soluble fibrin generation on subsequent platelet GPVI function was investigated...
October 5, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28967470/involvement-of-synovial-matrix-degradation-and-angiogenesis-in-oxidative-stress-exposed-degenerative-rotator-cuff-tears-with-osteoarthritis
#7
Kyu-Cheol Noh, Sin-Hye Park, Cheol Jung Yang, Geun Woo Lee, Min Ki Kim, Young-Hee Kang
BACKGROUND: Shoulder osteoarthritis is a gradual wearing of the articular cartilage concomitant with degenerative rotator cuff tears (RCTs). This pathologic disorder is related to inflammation, oxidative stress, and angiogenesis. Degenerative alterations may prompt production of cytokines and angiogenesis-related proteins, evoking rotator cuff diseases. This study tested the hypothesis that oxidative stress-responsive mediators can influence joint inflammation of patients with RCT. METHODS: Twelve healthy RCT patients not suffering shoulder osteoarthritis were categorized as the control group, and 24 patients were allocated to 2 RCT groups (RCTP1 and RCTP2), according to severity of RCT and glenohumeral arthritis...
September 26, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28960933/autologous-bioscaffolds-based-on-different-concentrations-of-platelet-rich-plasma-and-synovial-fluid-as-a-vehicle-for-mesencymal-stem-cells
#8
Ane Garate, Pello Sánchez, Diego Delgado, Ane Miren Bilbao, Emma Muiños-López, Froilán Granero-Moltó, Gorka Orive, Felipe Prosper, José Luis Pedraz, Mikel Sánchez
In the field of tissue engineering, diverse types of bioscaffolds are being developed currently for osteochondral defect applications. In this work, a novel scaffold based on Platelet Rich Plasma and hyaluronic acid with Mesenchymal stem cells (MSCs) has been evaluated to observe its effect on immobilized cells. The bio-scaffolds were prepared by mixing different volumes of synovial fluid (SF) with Platelet Rich Plasma (PRP) from patients obtaining 3 formulations at PRP-SF ratios of 3:1, 1:1 and 1:3 (vol/vol)...
September 27, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28960123/assessment-of-platelet-function-on-the-routine-coagulation-analyzer-sysmex-cs-2000i
#9
Corinne Frère, Katsushi Kobayashi, Claire Dunois, Jean Amiral, Pierre-Emmanuel Morange, Marie-Christine Alessi
BACKGROUND: Light transmission aggregometry (LTA) is considered as the gold standard for testing platelet function in the setting of both platelet disorders suspicion and response to antiplatelet therapy evaluation. LTA requires however specialized equipment, substantial blood sample volumes, is technically challenging and time-consuming. AIM: To evaluate an automated platelet aggregation method performed on a routine coagulation analyzer Sysmex CS-2000i. METHODS: 46 patients presenting a bleeding syndrome and 62 patients with acute coronary syndrome receiving dual antiplatelet therapy were studied in total...
September 29, 2017: Platelets
https://www.readbyqxmd.com/read/28886194/a-new-rabbit-model-of-impaired-wound-healing-in-an-x-ray-irradiated-field
#10
Kazutoshi Fujita, Soh Nishimoto, Toshihiro Fujiwara, Yohei Sotsuka, Maki Tonooka, Kenichiro Kawai, Masao Kakibuchi
Radiation is an important therapy for cancer with many benefits; however, its side effects, such as impaired wound healing, are a major problem. While many attempts have been made to overcome this particular disadvantage, there are few effective treatments for impaired wound healing in an X-ray-irradiated field. One reason for this deficiency is the lack of experimental models, especially animal models. We have previously reported a mouse model of impaired wound healing in which the irradiation area was restricted to the hindlimbs...
2017: PloS One
https://www.readbyqxmd.com/read/28806294/the-tissue-engineered-tendon-bone-interface-in-vitro-and-in-vivo-synergistic-effects-of-adipo-derived-stem-cells-platelet-rich-plasma-and-extracellular-matrix-hydrogel
#11
Rory McGoldrick, Arhana Chattopadhyay, Christopher Crowe, Grace Chiou, Kenneth Hui, Simon Farnebo, Christopher Davis, Anais Le Grand, Molly Jacobs, Hung Pham, James Chang
INTRODUCTION: Suboptimal healing of the tendon bone interface (TBI) remains an unsolved problem. One solution is a biocompatible tissue engineered construct that promotes augmented healing. We hypothesisze that 1.) the presence of Platelet Rich Plasma (PRP) and prolonged in vitro incubation produces tissue engineered tendon bone interface scaffolds with greater reseeding of viable Adipo-derived Stem Cells (ADSC) and 2.) when implanted with extracellular matrix hydrogel, constructs will display superior in vivo strength repair and biocompatibility...
August 3, 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28765945/platelet-rich-plasma-exhibits-beneficial-effects-for-rheumatoid-arthritis-mice-by-suppressing-inflammatory-factors
#12
Shichao Tong, Changqing Zhang, Ji Liu
Platelet-rich plasma (PRP) is a multifunctional blood product containing highly concentrated platelets, and various cell growth factors which promote cell proliferation and differentiation. PRP exhibited benefits in injurious articular cartilage repair and the removal of inflammatory factors in clinical studies. Rheumatoid arthritis (RA) is an autoimmune disease manifesting primarily as inflammatory arthritis, which is associated with notable morbidity in humans. In the present study, the therapeutic effects and primary mechanism of PRP on a type II collagen‑induced arthritis (CIA) mouse model was investigated...
October 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28762630/comparison-of-multiple-electrode-aggregometry-with-lumi-aggregometry-for-the-diagnosis-of-patients-with-mild-bleeding-disorders
#13
R Al Ghaithi, S Drake, S P Watson, N V Morgan, P Harrison
Essentials There is a clinical need for new technologies to measure platelet function in whole blood. Mild bleeding disorders were evaluated using multiple electrode aggregometry (MEA). MEA is insensitive at detecting patients with mild platelet function and secretion defects. More studies are required to investigate MEA in patients with a defined set of platelet disorders. SUMMARY: Background Multiple electrode aggregometry (MEA) measures changes in electrical impedance caused by platelet aggregation in whole blood...
August 1, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28761774/proinflammatory-and-anabolic-gene-expression-effects-of-platelet-rich-gel-supernatants-on-equine-synovial-membrane-explants-challenged-with-lipopolysaccharide
#14
Jorge U Carmona, Diana L Ríos, Catalina López, María E Álvarez, Jorge E Pérez
Platelet-rich plasma (PRP) preparations are used in horses with osteoarthritis (OA). However, some controversies remain regarding the ideal concentration of platelets and leukocytes to produce an adequate anti-inflammatory and anabolic response in the synovial membrane. The aims of this study were to study the influence of leukoconcentrated platelet-rich gel (Lc-PRG) and leukoreduced platelet-rich gel (Lr-PRG) supernatants on the quantitative expression of some proinflammatory and anabolic genes in equine synovial membrane explants (SMEs) challenged with lipopolysaccharide (LPS)...
2017: Veterinary Medicine International
https://www.readbyqxmd.com/read/28760125/comparison-of-the-effects-of-human-recombinant-epidermal-growth-factor-and-platelet-rich-plasma-on-healing-of-rabbit-patellar-tendon
#15
Baran Sarıkaya, Nihat Yumuşak, Akın Yigin, Serkan Sipahioğlu, Ünal Yavuz, Mehmet Akif Altay
OBJECTIVES: This study aims to compare the histological healing process and gene expression profile in tendon after the administration of human recombinant epidermal growth factor (hrEGF) and platelet-rich plasma (PRP). MATERIALS AND METHODS: A total of 24 mature New Zealand white rabbits (6-month-old; weight 2.5-3.0 kg) were used in the study. Patellar tendons of rabbits were tenotomized and then repaired. Rabbits were separated into three groups and repair areas were injected with 1 mL hrEGF in group 1 (n=9) and 1 mL PRP in group 2 (n=9)...
August 2017: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
https://www.readbyqxmd.com/read/28752097/efficacy-of-platelet-rich-plasma-in-retarding-intervertebral-disc-degeneration-a-meta-analysis-of-animal-studies
#16
Pei Li, Ruijie Zhang, Qiang Zhou
OBJECTIVES: Several animal studies have demonstrated the positive effects of platelet-rich plasma (PRP) on disc degeneration retardation. The present meta-analysis was to verify the efficacy of PRP in retarding disc degeneration in animal. METHODS: Relevant studies were identified and evaluated according to our inclusion and exclusion criteria. The standardized mean difference (SMD) and related 95% confidence interval (95% CI) were estimated to assess PRP efficiency...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28733091/histological-analysis-of-the-association-of-low-level-laser-therapy-and-platelet-rich-plasma-in-regeneration-of-muscle-injury-in-rats
#17
Thiago Alves Garcia, Regina Celi Trindade Camargo, Tatiana Emy Koike, Guilherme Akio Tamura Ozaki, Robson Chacon Castoldi, José Carlos Silva Camargo Filho
OBJECTIVE: Muscle injuries are common, and their treatment requires costs and time off. Platelet rich plasma and low level laser therapy have been shown to be affordable and easy to use. The aim of this study was to evaluate the associated effects of low level laser therapy and platelet rich plasma on the treatment of the soleus muscle injured by strain in rats. METHODS: Thirty-five rats were randomly allocated into five groups: Control (C), Injury Control (IC), injury PRP (IP), injury LLLT (ILT) and injury LLLT and PRP (ILTP)...
July 4, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28697880/comparison-of-autologous-bone-marrow-and-adipose-tissue-derived-mesenchymal-stem-cells-and-platelet-rich-plasma-for-treating-surgically-induced-lesions-of-the-equine-superficial-digital-flexor-tendon
#18
COMPARATIVE STUDY
A Romero, L Barrachina, B Ranera, A R Remacha, B Moreno, I de Blas, A Sanz, F J Vázquez, A Vitoria, C Junquera, P Zaragoza, C Rodellar
Several therapies have been investigated for equine tendinopathies, but satisfactory long term results have not been achieved consistently and a better understanding of the healing mechanism elicited by regenerative therapies is needed. The aim of this study was to assess the separate effects of autologous bone marrow (BM) and adipose tissue (AT) derived mesenchymal stem cells (MSCs), and platelet rich plasma (PRP), for treating lesions induced in the superficial digital flexor tendon (SDFT) of horses. Lesions were created surgically in both SDFTs of the forelimbs of 12 horses and were treated with BM-MSCs (six tendons), AT-MSCs (six tendons) or PRP (six tendons)...
June 2017: Veterinary Journal
https://www.readbyqxmd.com/read/28694685/differential-effect-of-platelet-rich-plasma-fractions-on-%C3%AE-1-integrin-signaling-collagen-biosynthesis-and-prolidase-activity-in-human-skin-fibroblasts
#19
Tomasz Guszczyn, Arkadiusz Surażyński, Ilona Zaręba, Edyta Rysiak, Janusz Popko, Jerzy Pałka
The study was conducted to evaluate the effects of platelet-rich plasma (PRP), supernatant of PRP (SPRP) obtained by centrifugation, and supernatant of activated PRP (SActi-PRP) obtained by Ca(2+) solution-treated PRP on collagen biosynthesis, prolidase activity, and β1-integrin signaling in cultured human skin fibroblasts. Incubation of fibroblasts with 5% PRP for 24 h contributed to ~5-fold increase in collagen biosynthesis compared to the control. In the cells treated with 5% of SPRP or SActi-PRP, collagen biosynthesis showed a 3-fold increase of the control...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28692513/viability-and-biomechanics-of-diced-cartilage-blended-with-platelet-rich-plasma-and-wrapped-with-poly-lactic-co-glycolic-acid-membrane
#20
Jun-Lin Liao, Jia Chen, Bin He, Yong Chen, Jia-Qun Xu, Hong-Ju Xie, Feng Hu, Ai-Jun Wang, ChengQun Luo, Qing-Feng Li, Jian-Da Zhou
OBJECTIVES: The objective of this study was to investigate the viability and biomechanics of diced cartilage blended with platelet-rich plasma (PRP) and wrapped with poly (lactic-co-glycolic) acid (PLGA) membrane in a rabbit model. METHODS: A total of 10 New Zealand rabbits were used for the study. Cartilage grafts were harvested from 1 side ear. The grafts were divided into 3 groups for comparison: bare diced cartilage, diced cartilage wrapped with PLGA membrane, and diced cartilage blended with PRP and wrapped with PLGA membrane...
September 2017: Journal of Craniofacial Surgery
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