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Platelet Rich Blood

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https://www.readbyqxmd.com/read/28302625/silencing-of-anticoagulant-protein-c-evokes-low-incident-but-spontaneous-atherothrombosis-in-apolipoprotein-e-deficient-mice
#1
Amber B Ouweneel, Marco Heestermans, Robin A F Verwilligen, Marion J J Gijbels, Pieter H Reitsma, Miranda van Eck, Bart J M van Vlijmen
OBJECTIVE: Murine atherosclerosis models do not spontaneously develop atherothrombotic complications. We investigated whether disruption of natural anticoagulation allows preexisting atherosclerotic plaques to progress toward an atherothrombotic phenotype. APPROACH AND RESULTS: On lowering of plasma protein C levels with small interfering RNA (siProc) in 8-week Western-type diet-fed atherosclerotic apolipoprotein E-deficient mice, one out of 4 mice displayed a large, organized, and fibrin- and leukocyte-rich thrombus on top of an advanced atherosclerotic plaque located in the aortic root...
March 16, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28295124/evaluation-of-the-effect-of-platelet-rich-fibrin-on-long-bone-healing-an-experimental-rat-model
#2
Turan Cihan Dülgeroglu, Hasan Metineren
Pseudoarthrosis, or nonunion, of the long bones is a challenging medical condition for orthopedic surgeons to treat. Therefore, healing enhancer materials are commonly used. The authors investigated whether platelet-rich fibrin accelerates long bone healing by comparing radiological and histological findings in a rat model of open femoral fracture. Platelet-rich fibrin is a current biomaterial that contains many growth factors and platelets. There are no studies in the literature investigating the effects of platelet-rich fibrin on fracture healing...
March 14, 2017: Orthopedics
https://www.readbyqxmd.com/read/28292729/pre-analytical-effects-of-pneumatic-tube-system-transport-on-routine-haematology-and-coagulation-tests-global-coagulation-assays-and-platelet-function-assays
#3
Sandra Le Quellec, Mickaël Paris, Christophe Nougier, Frédéric Sobas, Lucia Rugeri, Sandrine Girard, Jean-Claude Bordet, Claude Négrier, Yesim Dargaud
INTRODUCTION: Pneumatic tube system (PTS) in hospitals is commonly used for the transport of blood samples to clinical laboratories, as it is rapid and cost-effective. The aim was to compare the effects on haematology samples of a newly acquired ~2km-long PTS that links 2 hospitals with usual transport (non-pneumatic tube system, NPTS). METHODS: Complete blood cell count, routine coagulation assays, platelet function tests (PFT) with light-transmission aggregometry and global coagulation assays including ROTEM® and thrombin generation assay (TGA) were performed on blood samples from 30 healthy volunteers and 9 healthy volunteers who agreed to take aspirin prior to blood sampling...
December 28, 2016: Thrombosis Research
https://www.readbyqxmd.com/read/28283682/reduction-of-relative-centrifugation-force-within-injectable-platelet-rich-fibrin-prf-concentrates-advances-patients-own-inflammatory-cells-platelets-and-growth-factors-the-first-introduction-to-the-low-speed-centrifugation-concept
#4
J Choukroun, S Ghanaati
PURPOSE: The aim of this study was to analyze systematically the influence of the relative centrifugation force (RCF) on leukocytes, platelets and growth factor release within fluid platelet-rich fibrin matrices (PRF). MATERIALS AND METHODS: Systematically using peripheral blood from six healthy volunteers, the RCF was reduced four times for each of the three experimental protocols (I-III) within the spectrum (710-44 g), while maintaining a constant centrifugation time...
March 10, 2017: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/28277063/quantification-of-growth-factors-in-different-platelet-concentrates
#5
Jing Qiao, Na An, Xiangying Ouyang
Concentrated growth factor (CGF), a new generation of platelet concentrate product, appears to have more abundant growth factors because of its special centrifugation process. However, there are few studies supporting this. This study was designed to evaluate the contents of major growth factors in CGF and compare them with those found in PRP (platelet-rich plasma) and PRF (platelet-rich fibrin). PRP, PRF, and CGF were obtained from the same samples of peripheral blood. Concentrations of five representative growth factors in platelets were measured with enzyme-linked immunosorbent assay (ELISA): platelet-derived growth factor-BB (PDGF-BB), transforming growth factor β-1 (TGF-β1), insulin-like growth factor-1 (IGF-1), vascular endothelial growth factor (VEGF), and basic fibroblast growth factor (bFGF)...
February 21, 2017: Platelets
https://www.readbyqxmd.com/read/28273236/three-dimensional-structure-and-cytokine-distribution-of-platelet-rich-fibrin
#6
Meng-Yi Bai, Ching-Wei Wang, Jyun-Yi Wang, Ming-Fang Lin, Wing P Chan
OBJECTIVES: Previous reports have revealed that several cytokines (including platelet-derived growth factor-BB, transforming growth factors-β1 and insulin-like growth factor-1) can enhance the rate of bone formation and synthesis of extracellular matrix in orthopaedics or periodontology. This study aimed to determine the concentration of cytokines within platelet-rich fibrin microstructures and investigate whether there are differences in the different portions of platelet-rich fibrin, which has implications for proper clinical use of platelet-rich fibrin gel...
February 1, 2017: Clinics
https://www.readbyqxmd.com/read/28272145/improved-survival-of-full-thickness-skin-graft-with-low-molecular-weight-heparin-protamine-micro-nanoparticles-including-platelet-rich-plasma
#7
Yuki Takabayashi, Masayuki Ishihara, Masahiro Kuwabara, Makoto Takikawa, Shingo Nakamura, Hidemi Hattori, Tomoharu Kiyosawa
BACKGROUND: Activated platelet-rich plasma secrets many growth factors (GFs), and low-molecular weight heparin-protamine micro/nanoparticles (LMWH-P M/NPs) significantly interact with, enhance, and stabilize the secreted GFs. OBJECTIVE: The purpose of this study was to evaluate the effects of LMWH-P M/NPs and GFs (from platelet-rich plasma) on full-thickness skin graft (FTSG). METHODS: A total of 96 inbred male rats were anesthetized and 4-cm full-thickness skin wound were created on dorsal skin of rats...
March 8, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28269759/effects-of-different-concentrations-of-platelet-rich-plasma-and-platelet-poor-plasma-on-vitality-and-differentiation-of-autologous-adipose-tissue-derived-stem-cells
#8
Oliver Felthaus, Lukas Prantl, Mona Skaff-Schwarze, Silvan Klein, Alexandra Anker, Marco Ranieri, Britta Kühlmann
BACKGROUND: Autologous fat grafts and adipose-derived stem cells (ASCs) can be used to treat soft tissue defects. However, the results are inconsistent and sometimes comprise tissue resorption and necrosis. This might be due to insufficient vascularization. Platelet-rich plasma (PRP) is a source of concentrated autologous platelets. The growth factors and cytokines released by platelets can facilitate angiogenesis. The simultaneous use of PRP might improve the regeneration potential of fat grafts...
February 28, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28263863/the-influence-of-surface-chemistry-on-adsorbed-fibrinogen-conformation-orientation-fiber-formation-and-platelet-adhesion
#9
Liudi Zhang, Brendan Casey, Dennis K Galanakis, Clement Marmorat, Shelby Skoog, Katherine Vorvolakos, Marcia Simon, Miriam H Rafailovich
Thrombosis is a clear risk when any foreign material is in contact with the bloodstream. Here we propose an immunohistological stain-based model for non-enzymatic clot formation that enables a facile screen for the thrombogenicity of blood-contacting materials. We exposed polymers with different surface chemistries to protease-free human fibrinogen. We observed that on hydrophilic surfaces, fibrinogen is adsorbed via αC regions, while the γ400-411 platelet-binding dodecapeptide on the D region becomes exposed, and fibrinogen fibers do not form...
March 2, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28260184/co2-laser-for-the-treatment-of-diabetic-foot-ulcers-with-exposed-bone-a-consecutive-series-of-type-2-diabetic-patients
#10
M Monami, C Mirabella, A Scatena, B Nreu, S Zannoni, S Aleffi, L Giannoni, E Mannucci
AIM: The treatment of foot ulcers with exposed bone is challenging, because of the risk of infection and of difficulties in the development of granulation tissue. A CO2 laser beam could be used to produce discontinuities in periosteum, allowing the exposure of blood containing multipotent stem cells, capable of initiating the healing process. The local application of platelet-rich plasma (PRP) has been proposed as a therapeutic tool for accelerating healing in foot ulcers, including those in patients with diabetes...
March 4, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28251561/platelet-rich-fibrin-prepared-from-stored-whole-blood-samples
#11
Kazushige Isobe, Masashi Suzuki, Taisuke Watanabe, Yutaka Kitamura, Taiji Suzuki, Hideo Kawabata, Masayuki Nakamura, Toshimitsu Okudera, Hajime Okudera, Kohya Uematsu, Koh Nakata, Takaaki Tanaka, Tomoyuki Kawase
BACKGROUND: In regenerative therapy, self-clotted platelet concentrates, such as platelet-rich fibrin (PRF), are generally prepared on-site and are immediately used for treatment. If blood samples or prepared clots can be preserved for several days, their clinical applicability will expand. Here, we prepared PRF from stored whole-blood samples and examined their characteristics. METHODS: Blood samples were collected from non-smoking, healthy male donors (aged 27-67 years, N = 6), and PRF clots were prepared immediately or after storage for 1-2 days...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28249049/platelet-independent-adhesion-of-calcium-loaded-erythrocytes-to-von-willebrand-factor
#12
Michel W J Smeets, Ruben Bierings, Henriet Meems, Frederik P J Mul, Dirk Geerts, Alexander P J Vlaar, Jan Voorberg, Peter L Hordijk
Adhesion of erythrocytes to endothelial cells lining the vascular wall can cause vaso-occlusive events that impair blood flow which in turn may result in ischemia and tissue damage. Adhesion of erythrocytes to vascular endothelial cells has been described in multiple hemolytic disorders, especially in sickle cell disease, but the adhesion of normal erythrocytes to endothelial cells has hardly been described. It was shown that calcium-loaded erythrocytes can adhere to endothelial cells. Because sickle erythrocyte adhesion to ECs can be enhanced by ultra-large von Willebrand factor multimers, we investigated whether calcium loading of erythrocytes could promote binding to endothelial cells via ultra-large von Willebrand factor multimers...
2017: PloS One
https://www.readbyqxmd.com/read/28245395/-preparation-of-platelet-rich-plasma-from-the-white-slurry-and-its-effect-on-msc-proliferation
#13
Ke-Tao Wang, Zhong-Li Li, Heng Zhu, Yuan-Yuan Qin, Yi-Meng Yang, Ji Li, Ru-Ju Lv, Yuan-Lin Liu, Ning Mao, Yi Zhang
OBJECTIVE: To isolate platelet-rich plasma(PRP) from the white slurry(WS), a depleted fraction of the clinical blood supply, so as to provide an easier method to harvest PRP for related studies and clinical use. METHODS: The protocols preparing PRP from whole blood and WS were compared. The morphological characteristics of the different PRPs were observed under transmission electron microscope; the expression of the platelet markers CD41a and CD42b were detected by the flow cytometry...
February 2017: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/28241824/treatment-of-chronic-non-healing-ulcers-using-autologous-platelet-rich-plasma-a-case-series
#14
Manish Suthar, Saniya Gupta, Suhail Bukhari, Venkatesh Ponemone
BACKGROUND: Non-healing ulcers are a major health problem worldwide and have great impact at personal, professional and social levels, with high cost in terms of human and material resources. Recalcitrant non-healing ulcers are inevitable and detrimental to the lower limb and are a major cause of non-traumatic lower limb amputations. Application of autologous Platelet Rich Plasma (PRP) has been a major breakthrough for the treatment of non-healing and diabetic foot ulcers, as it is an easy and cost-effective method, and provides the necessary growth factors that enhance tissue healing...
February 27, 2017: Journal of Biomedical Science
https://www.readbyqxmd.com/read/28229135/the-colonic-metabolites-dihydrocaffeic-acid-and-dihydroferulic-acid-are-more-effective-inhibitors-of-in-vitro-platelet-activation-than-their-phenolic-precursors
#15
Gema Baeza, Eva-Maria Bachmair, Sharon Wood, Raquel Mateos, Laura Bravo, Baukje de Roos
Cardiovascular disease (CVD) is the major cause of morbidity and mortality worldwide. The consumption of a healthy diet rich in polyphenols has been inversely associated with the development of CVD. This study evaluated the effects of green coffee bean extract (GCBE) and yerba mate phenolic extract (YMPE), the main phenolic and methylxanthine constituents (5-caffeoylquinic acid, 3,5-dicaffeoylquinic acid, caffeine, and theobromine), and their main metabolites (caffeic acid, ferulic acid, dihydrocaffeic acid (DHCA) and dihydroferulic acid (DHFA)) on platelet activation in vitro...
February 23, 2017: Food & Function
https://www.readbyqxmd.com/read/28216604/evaluation-of-not-activated-and-activated-prp-in-hair-loss-treatment-role-of-growth-factor-and-cytokine-concentrations-obtained-by-different-collection-systems
#16
Pietro Gentile, John P Cole, Megan A Cole, Simone Garcovich, Alessandra Bielli, Maria Giovanna Scioli, Augusto Orlandi, Chiara Insalaco, Valerio Cervelli
Platelet rich plasma (PRP) was tested as a potential therapy for androgenetic alopecia (AGA) through two different clinical protocols in which one population (18 participants) received half-head treatment with autologous non-activated PRP (A-PRP) produced by CPunT Preparation System (Biomed Device, Modena, Italy) and the other half-head with placebo, and a second separated population in which all participants (n = 6, 3 participants per group) received treatment with calcium-activated PRP (AA-PRP) produced from one of two different PRP collection devices (Regen Blood Cell Therapy or Arthrex Angel System)...
February 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28210651/analysis-of-platelet-rich-plasma-extraction-variations-in-platelet-and-blood-components-between-4-common-commercial-kits
#17
Jane Fitzpatrick, Max K Bulsara, Paul Robert McCrory, Martin D Richardson, Ming Hao Zheng
BACKGROUND: Platelet-rich plasma (PRP) has been extensively used as a treatment in tissue healing in tendinopathy, muscle injury, and osteoarthritis. However, there is variation in methods of extraction, and this produces different types of PRP. PURPOSE: To determine the composition of PRP obtained from 4 commercial separation kits, which would allow assessment of current classification systems used in cross-study comparisons. STUDY DESIGN: Controlled laboratory study...
January 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28207887/platelet-monocyte-derived-and-tissue-factor-carrying-circulating-microparticles-are-related-to-acute-myocardial-infarction-severity
#18
Gemma Chiva-Blanch, Kristian Laake, Peder Myhre, Vibeke Bratseth, Harald Arnesen, Svein Solheim, Lina Badimon, Ingebjørg Seljeflot
OBJECTIVE: Circulating microparticles (cMPs) are phospholipid-rich vesicles released from cells when activated or injured, and contribute to the formation of intracoronary thrombi. Tissue factor (TF, CD142) is the main trigger of fibrin formation and TF-carrying cMPs are considered one of the most procoagulant cMPs. Similar types of atherosclerotic lesions may lead to different types of AMI, although the mechanisms behind are unresolved. Therefore, we aimed to investigate the phenotype of cMPs found in plasma of ACS patients and its relation to AMI severity and thrombotic burden...
2017: PloS One
https://www.readbyqxmd.com/read/28202370/to-evaluate-the-role-of-platelet-rich-plasma-in-healing-of-acute-diaphyseal-fractures-of-the-femur
#19
Roop Singh, Rajesh Rohilla, Jeetesh Gawande, Paramjit Kumar Sehgal
PURPOSE: New research is focusing on the use of autologous growth factors to increase the effect of bone fracture healing while decreasing the amount of healing time for the patient. Platelets have been demonstrated to be the natural storage vessel for several growth factors and cytokines that promote blood coagulation, tissue repair, and the process of bone mineralization. The present study aims to evaluate the role of platelet-rich plasma (PRP) in healing of acute femoral shaft fractures radiologically...
February 2017: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
https://www.readbyqxmd.com/read/28186691/balancing-microbial-and-mammalian-cell-functions-on-calcium-ion-modified-implant-surfaces
#20
Eduardo Anitua, Ricardo Tejero, Miguel Ángel Pacha-Olivenza, María Coronada Fernández-Calderón, María Delgado-Rastrollo, Mari Mar Zalduendo, María Troya, Ciro Pérez-Giraldo, María Luisa González-Martín
Implant integration is a complex process mediated by the interaction of the implant surface with the surrounding ions, proteins, bacteria, and tissue cells. Although most implants achieve long-term bone-tissue integration, preventing pervasive implant-centered infections demands further advances, particularly in surfaces design. In this work, we analyzed classical microrough implant surfaces (only acid etched, AE; sandblasted then acid etching, SB + AE) and a new calcium-ion-modified implant surface (AE + Ca) in terms of soft- and hard-tissue integration, bacterial adhesion, and biofilm formation...
February 10, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
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