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Leukocyte rich platelet rich plasma

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https://www.readbyqxmd.com/read/28424777/influence-of-cellular-composition-and-exogenous-activation-on-growth-factor-and-cytokine-concentrations-in-canine-platelet-rich-plasmas
#1
Samuel P Franklin, Kate E Birdwhistell, Alena Strelchik, Bridget C Garner, Benjamin M Brainard
OBJECTIVE: The purposes of this study were to (1) evaluate correlations among platelet, leukocyte, growth factor, and cytokine concentrations in canine platelet-rich plasmas (PRPs) produced from five different canine PRP-concentrating systems and (2) compare the effects of different activation protocols on platelet activation and growth factor release from one of these PRPs. METHODS: PRP was made using blood from 15 dogs and each of 5 different PRP systems in a cross-over design...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28375975/autologous-pure-platelet-rich-plasma-dermal-injections-for-facial-skin-rejuvenation-clinical-instrumental-and-flow-cytometry-assessment
#2
Norma Cameli, Maria Mariano, Iole Cordone, Elva Abril, Serena Masi, Maria Laura Foddai
BACKGROUND: Platelet-rich plasma (PRP) is an emerging treatment in dermatology recently proposed for skin rejuvenation. OBJECTIVE: To evaluate the efficacy and safety of autologous pure PRP dermal injections on facial skin rejuvenation, investigating the cellularity of PRP samples. MATERIALS AND METHODS: Twelve patients underwent 3 sessions of PRP injection at 1-month intervals. The clinical and instrumental outcomes were evaluated before (T0) and 1 month (T1) after the end of treatment by means of transepidermal water loss, corneometry, Cutometer, Visioscan, and Visioface...
April 3, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28351189/effects-of-an-injectable-platelet-rich-fibrin-on-osteoblast-behavior-and-bone-tissue-formation-in-comparison-to-platelet-rich-plasma
#3
Xuzhu Wang, Yufeng Zhang, Joseph Choukroun, Shahram Ghanaati, Richard J Miron
Platelet-rich plasma (PRP) has been utilized for many years as a regenerative agent capable of inducing vascularization of various tissues using blood-derived growth factors. Despite this, drawbacks mostly related to the additional use of anti-coagulants found in PRP have been shown to inhibit the wound healing process. For these reasons, a novel platelet concentrate has recently been developed with no additives by utilizing lower centrifugation speeds. The purpose of this study was therefore to investigate osteoblast behavior of this novel therapy (injectable-platelet-rich fibrin; i-PRF, 100% natural with no additives) when compared to traditional PRP...
March 29, 2017: Platelets
https://www.readbyqxmd.com/read/28341267/in-vivo-clinical-and-radiological-effects-of-platelet-rich-plasma-on-interstitial-supraspinatus-lesion-case-series
#4
A Lädermann, M A Zumstein, F C Kolo, M Grosclaude, L Koglin, A J P Schwitzguebel
BACKGROUND: Rotator cuff tear (RCT) is a frequent condition of clinical relevance that can be managed with a symptomatic conservative treatment, but surgery is often needed. Biological components like leukocytes and platelet rich plasma (L-PRP) could represent an alternative curative method for interstitial RCT. HYPOTHESES: It has been hypothesized that an ultrasound guided L-PRP injection in supraspinatus interstitial RCT could induce radiological healing. MATERIAL AND METHODS: A prospective case series including 25 patients was performed in order to assess the effect of L-PRP infiltration into supraspinatus interstitial RCTs...
December 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28339078/comparative-evaluation-of-the-effects-of-platelet%C3%A2-rich-plasma-formulations-on-extracellular-matrix-formation-and-the-nf%C3%A2-%C3%AE%C2%BAb-signaling-pathway-in-human-articular-chondrocytes
#5
Wenjing Yin, Haitao Xu, Jiagen Sheng, Zhengliang Xu, Xuetao Xie, Changqing Zhang
Concentrated leukocytes in leukocyte and platelet‑rich plasma (L‑PRP) may deliver increased levels of pro‑inflammatory cytokines to activate the nuclear factor (NF)‑κB signaling pathway, to counter or overwhelm the beneficial effects of growth factors on cartilage regeneration. However, to date, no relevant studies have substantiated this. In the present study, L‑PRP and pure platelet‑rich plasma (P‑PRP) were prepared, and leukocytes, platelets, pro‑inflammatory cytokines and growth factor concentrations were quantified; they were then used to treat human articular chondrocytes (HACs)...
May 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28302625/silencing-of-anticoagulant-protein-c-evokes-low-incident-but-spontaneous-atherothrombosis-in-apolipoprotein-e-deficient-mice
#6
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/28301205/intratendon-delivery-of-leukocyte-poor-platelet-rich-plasma-improves-healing-compared-with-leukocyte-rich-platelet-rich-plasma-in-a-rabbit-achilles-tendinopathy-model
#7
Ruijian Yan, Yanjia Gu, Jisheng Ran, Yejun Hu, Zefeng Zheng, Mengfeng Zeng, Boon Chin Heng, Xiao Chen, Zi Yin, Weishan Chen, Weiliang Shen, Hongwei Ouyang
BACKGROUND: Chronic tendinopathy is a commonly occurring clinical problem that affects both athletes and inactive middle-aged patients. Although some studies have shown that different platelet-rich plasma (PRP) preparations could exert various therapeutic effects in vitro, the role of leukocytes in PRP has not yet been defined under tendinopathy conditions in vivo. PURPOSE: This study compared the effects of the intratendon delivery of leukocyte-poor PRP (Lp-PRP) versus leukocyte-rich PRP (Lr-PRP) in a rabbit chronic tendinopathy model in vivo...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28296518/effect-of-platelet-rich-plasma-on-rat-achilles-tendon-healing-is-related-to-microbiota
#8
Franciele Dietrich, Malin Hammerman, Parmis Blomgran, Love Tätting, Vinicius Faccin Bampi, Jefferson Braga Silva, Per Aspenberg
Background and purpose - In 3 papers in Acta Orthopaedica 10 years ago, we described that platelet-rich plasma (PRP) improves tendon healing in a rat Achilles transection model. Later, we found that microtrauma has similar effects, probably acting via inflammation. This raised the suspicion that the effect ascribed to growth factors within PRP could instead be due to unspecific influences on inflammation. While testing this hypothesis, we noted that the effect seemed to be related to the microbiota. Material and methods - We tried to reproduce our old findings with local injection of PRP 6 h after tendon transection, followed by mechanical testing after 11 days...
March 15, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28265109/comparative-evaluation-of-leukocyte-and-platelet-rich-plasma-and-pure-platelet-rich-plasma-for-cartilage-regeneration
#9
Zhengliang Xu, Wenjing Yin, Yuelei Zhang, Xin Qi, Yixuan Chen, Xuetao Xie, Changqing Zhang
Platelet-rich plasma (PRP) has gained growing popularity in the treatment of articular cartilage lesions in the last decade. However, the potential harmful effects of leukocytes in PRP on cartilage regeneration have seldom been studied in vitro, and not at all in vivo yet. The objective of the present study is to compare the effects of leukocyte- and platelet-rich plasma (L-PRP) and pure platelet-rich plasma (P-PRP) on cartilage repair and NF-κB pathway, in order to explore the mechanism underlying the function of leukocytes in PRP in cartilage regeneration...
March 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28255569/platelet-rich-plasma-injections-for-advanced-knee-osteoarthritis-a-prospective-randomized-double-blinded-clinical-trial
#10
Nayana Joshi Jubert, Luciano Rodríguez, Maria Mercedes Reverté-Vinaixa, Aurora Navarro
BACKGROUND: Intra-articular injections of platelet-rich plasma (PRP) to treat symptoms of knee osteoarthritis (OA) have been successfully used in young patients and in the early stages of disease. No previous studies have analyzed outcomes of PRP injections during the late stages. HYPOTHESIS: PRP reduces pain and leads to a more effective and lasting functional recovery than corticosteroid with local anesthetic. STUDY DESIGN: Randomized controlled trial; Level of evidence, 2...
February 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28210651/analysis-of-platelet-rich-plasma-extraction-variations-in-platelet-and-blood-components-between-4-common-commercial-kits
#11
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/28146403/hyaluronic-acid-versus-platelet-rich-plasma-a-prospective-double-blind-randomized-controlled-trial-comparing-clinical-outcomes-and-effects-on-intra-articular-biology-for-the-treatment-of-knee-osteoarthritis
#12
Brian J Cole, Vasili Karas, Kristen Hussey, Kyle Pilz, Lisa A Fortier
BACKGROUND: The use of platelet-rich plasma (PRP) for the treatment of osteoarthritis (OA) has demonstrated mixed clinical outcomes in randomized controlled trials when compared with hyaluronic acid (HA), an accepted nonsurgical treatment for symptomatic OA. Biological analysis of PRP has demonstrated an anti-inflammatory effect on the intra-articular environment. PURPOSE: To compare the clinical and biological effects of an intra-articular injection of PRP with those of an intra-articular injection of HA in patients with mild to moderate knee OA...
February 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28056978/short-term-storage-stability-at-room-temperature-of-two-different-platelet-rich-plasma-preparations-from-equine-donors-and-potential-impact-on-growth-factor-concentrations
#13
Gregor Hauschild, Florian Geburek, Georg Gosheger, Maria Eveslage, Daniela Serrano, Arne Streitbürger, Sara Johannlükens, Dirk Menzel, Reinhard Mischke
BACKGROUND: The increasing interest in platelet-rich plasma (PRP) based therapies is as yet accompanied by inconsistent information regarding nearly all aspects of handling and application. Among these storage stability of processed platelet-rich products may be the basis for a more flexible application mode. The objective of this study was (1) to estimate the storage stability of growth factors platelet derived growth factor BB (PDGF-BB) and transforming growth factor ß1 (TGF-ß1) in both, a single-step softspin centrifugation-based pure-PRP (P-PRP, ACP®), and a gravity filtration system-based leukocyte-rich-PRP (L-PRP, E-PET), over a six hours time span after preparation at room temperature and (2) to identify possible factors influencing these growth factor concentrations in an equine model...
January 5, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28027451/the-use-of-platelet-rich-and-platelet-poor-plasma-to-enhance-differentiation-of-skeletal-myoblasts-implications-for-the-use-of-autologous-blood-products-for-muscle-regeneration
#14
Olga Miroshnychenko, Wen-Teh Chang, Jason L Dragoo
BACKGROUND: Platelet-rich plasma (PRP) has been used to augment tissue repair and regeneration after musculoskeletal injury. However, there is increasing clinical evidence that PRP does not show a consistent clinical effect. Purpose/Hypothesis: This study aimed to compare the effects of the following non-neutrophil-containing (leukocyte-poor) plasma fractions on human skeletal muscle myoblast (HSMM) differentiation: (1) PRP, (2) modified PRP (Mod-PRP), in which transforming growth factor β1 (TGF-β1) and myostatin (MSTN) were depleted, and (3) platelet-poor plasma (PPP)...
March 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28018086/leukocyte-poor-platelet-rich-plasma-to-treat-degenerative-meniscal-tear-a-case-report
#15
J P Betancourt, W D Murrell
A traumatic and/or degenerative meniscus lesion is thought to be a clinical manifestation of early-onset osteoarthritis (OA), which is a chronic progressive condition that can cause substantial pain and disability. Platelet-rich plasma (PRP) is an emerging treatment option that has been reported to improve healing. Here, we present a case of a 29-year-old woman, with left anterior and medial knee pain, without history of trauma or injury. The patient was managed with leukocyte-poor PRP injections derived from her peripheral blood with high concentrations of platelets, platelet-derived growth factors, and bioactive proteins, with a total follow-up of 30 months...
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/27900294/efficacy-of-autologous-leukocyte-reduced-platelet-rich-plasma-therapy-for-patellar-tendinopathy-in-a-rat-treadmill-model
#16
Mamoru Yoshida, Hiroki Funasaki, Keishi Marumo
BACKGROUND: An autologous platelet-rich plasma (PRP) therapy has currently been applied for the tendinopathy; however, its efficacy and an optimal platelets concentration in PRP were uncertain. We analyzed them in an animal model prepared using a repetitive running exercise. METHODS: We made the tendinopathy rat model of patellar tendon using a rodent treadmill machine. Rats with tendinopathy were injected with leukocyte-reduced PRP at the platelets concentration of 1...
April 2016: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/27849108/influence-of-calcium-salts-and-bovine-thrombin-on-growth-factor-release-from-equine-platelet-rich-gel-supernatants
#17
Carlos E Giraldo, María E Álvarez, Jorge U Carmona
OBJECTIVE: To compare five activation methods in equine platelet-rich plasma (PRP) by determination of platelet-derived growth factor BB (PDGF-BB) and transforming growth factor beta 1 (TGF-β1) concentrations in platelet-rich gel (PRG) supernatants. METHODS: Platelet-rich plasma from 20 horses was activated by calcium chloride (CC), calcium gluconate (CG), bovine thrombin (BT), and their combinations, BTCC and BTCG. Both growth factor concentrations in PRG supernatants were measured by ELISA and compared with plasma and platelet lysates (PL) over time...
November 16, 2016: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/27775049/a-high-throughput-microfluidic-approach-for-1000-fold-leukocyte-reduction-of-platelet-rich-plasma
#18
Hui Xia, Briony C Strachan, Sean C Gifford, Sergey S Shevkoplyas
Leukocyte reduction of donated blood products substantially reduces the risk of a number of transfusion-related complications. Current 'leukoreduction' filters operate by trapping leukocytes within specialized filtration material, while allowing desired blood components to pass through. However, the continuous release of inflammatory cytokines from the retained leukocytes, as well as the potential for platelet activation and clogging, are significant drawbacks of conventional 'dead end' filtration. To address these limitations, here we demonstrate our newly-developed 'controlled incremental filtration' (CIF) approach to perform high-throughput microfluidic removal of leukocytes from platelet-rich plasma (PRP) in a continuous flow regime...
October 24, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27759829/analysis-of-cytokine-profile-and-growth-factors-in-platelet-rich-plasma-obtained-by-open-systems-and-commercial-columns
#19
Alberto de Castro Pochini, Eliane Antonioli, Daniella Zanetti Bucci, Luiz Roberto Sardinha, Carlos Vicente Andreoli, Mario Ferretti, Benno Ejnisman, Anna Carla Goldberg, Moisés Cohen
Objective: To evaluate growth factors and cytokines in samples of platelet-rich plasma obtained by three different centrifugation methods. Methods: Peripheral blood of six individuals with no hematological diseases, aged 18 to 68 years, was drawn to obtain platelet-rich plasma, using the open method and commercial columns by Medtronic and Biomet. The products obtained with the different types of centrifugation were submitted to laboratory analysis, including pro-inflammatory cytokines and chemokines by flow cytometry assays, the concentration of fibroblast growth factors-2 (FGF-2) and transforming growth factor-beta1 (TGF-β1)...
July 2016: Einstein
https://www.readbyqxmd.com/read/27706013/the-early-histological-effects-of-intravesical-instillation-of-platelet-rich-plasma-in-cystitis-models
#20
M İrfan Dönmez, Kubilay İnci, Naciye Dilara Zeybek, H Serkan Doğan, Ali Ergen
PURPOSE: To evaluate the early histological effects of the intravesical instillation of platelet-rich plasma (PRP) in rabbit models of interstitial and hemorrhagic cystitis. METHODS: Thirty-six rabbits were classified into 6 groups: saline (S), S+PRP, hydrochloric acid (HCl), HCl+PRP, cyclophosphamide (CyP), and CyP+PRP. At 48 hours after induction, PRP was prepared and intravesically administered to the S+PRP, HCl+PRP, and CyP+PRP groups. Bladder sections were stained with toluidine blue for mast cell counting and with hematoxylin and eosin for histopathology and mitotic index determination...
September 2016: International Neurourology Journal
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