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Leukocyte rich platelet rich plasma

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https://www.readbyqxmd.com/read/29722762/prp-as-an-adjunct-to-rotator-cuff-tendon-repair
#1
F Alan Barber
Arthroscopic rotator cuff repair is a commonly performed repair. Technical developments provide surgeons the tools to create biomechanically robust repairs. How can the biological response mirror the strong and stable surgery? Platelet-rich plasma (PRP) is a supraphysiological platelet concentration which may positively augment rotator cuff healing. Not all PRPs are the same. High leukocyte levels and thrombin activation may be detrimental to tendon healing. Thrombin activation triggers an immediate release of growth factors and may actually inhibit some parts of the healing response...
June 2018: Sports Medicine and Arthroscopy Review
https://www.readbyqxmd.com/read/29719011/short-term-storage-of-platelet-rich-plasma-at-room-temperature-does-not-affect-growth-factor-or-catabolic-cytokine-concentration
#2
Brooke H Wilson, Brian J Cole, Margaret B Goodale, Lisa A Fortier
The aim of this study was to provide clinical recommendations about the use of platelet-rich plasma (PRP) that was subjected to short-term storage at room temperature. We determined bioactive growth factor and cytokine concentrations as indicators of platelet and white blood cell degranulation in blood and PRP. Additionally, this study sought to validate the use of manual, direct smear analysis as an alternative to automated methods for platelet quantification in PRP. Blood was used to generate low-leukocyte PRP (Llo PRP) or high-leukocyte PRP (Lhi PRP)...
April 2018: American Journal of Orthopedics
https://www.readbyqxmd.com/read/29684380/sustained-or-higher-levels-of-growth-factors-in-platelet-rich-plasma-during-7-day-storage
#3
Ying-Hao Wen, Wan-Ying Lin, Chi-Jui Lin, Yu-Chen Sun, Pi-Yueh Chang, Hsin-Yao Wang, Jang-Jih Lu, Wen-Lin Yeh, Tzong-Shi Chiueh
BACKGROUND: The effectiveness of platelet-rich plasma (PRP) for treating soft tissue injuries is still controversial. Most of PRPs were prepared simply by concentrating in volume and were injected right after preparation in physician offices. Neither platelet count nor growth factors were quantitated in advance. We prepared and stored leukocyte and platelet-rich plasma (L-PRP) by regular separation protocols for blood components in the blood bank. And we investigated the dynamic change of growth factors in the L-PRPs over the period of storage...
April 20, 2018: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/29566102/facilitated-recruitment-of-mesenchymal-stromal-cells-by-bone-marrow-concentrate-and-platelet-rich-plasma
#4
Hannah L Holmes, Brooke Wilson, Julian P Goerger, Jesse L Silverberg, Itai Cohen, Warren R Zipfel, Lisa A Fortier
BACKGROUND: Biologics containing growth factors are frequently used to enhance healing after musculoskeletal injuries. One mechanism of action is thought to be though the ability of biologics to induce homing and migration of endogenous mesenchymal stromal cells (MSCs) to a target tissue. However, the ability of biologics to stimulate chemotaxis (directed migration of cells) and chemokinesis (increase rate of cell migration) of MSCs is unknown. HYPOTHESIS/PURPOSE: The aim of this study was to directly compare the ability of biologics including platelet rich plasma (PRP) and bone marrow concentrate (BMC) to induce MSC migration...
2018: PloS One
https://www.readbyqxmd.com/read/29556269/leukocyte-depletion-does-not-affect-the-in-vitro-healing-ability-of-platelet-rich-plasma
#5
Ilaria Giusti, Marianna Di Francesco, Sandra D'Ascenzo, Paola Palumbo, Anna Rughetti, Luigi Dell'Orso, Paola Annunziata Varasano, Gabriella Lucidi Pressanti, Vincenza Dolo
The clinical use of platelet-rich plasma (PRP) containing or deprived of leukocytes remains a subject of debate and a controversial issue. It is not yet clear whether leukocyte content has a positive or negative effect on tissue healing processes. Several studies, conducted mainly in the orthopedic field, support the use of leukocyte-poor (LP) PRP, whereas other studies have not identified any significant differences between the use of LP and leukocyte-rich PRP. In the present study, the role of leukocytes contained in PRP was assessed to verify their in vitro effect on fibroblasts and endothelial cells, which have a leading role in the biological processes associated with wound healing (including angiogenesis and matrix remodeling)...
April 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29554150/effect-of-leukocyte-reduced-platelet-rich-plasma-on-osteoarthritis-caused-by-cranial-cruciate-ligament-rupture-a-canine-gait-analysis-model
#6
José M Vilar, Maria E Manera, Angelo Santana, Giuseppe Spinella, Oliver Rodriguez, Mónica Rubio, José M Carrillo, Joaquín Sopena, Miguel Batista
The goal of this study was to objectively assess the effect of a platelet-rich plasma (PRP) derivate in English bulldogs with stifle degenerative joint disease secondary to cranial cruciate ligament rupture (CCLR). We used a force platform and affixed electrogoniometers to measure peak vertical force (PVF), vertical impulse (VI), stance time (ST), and angular range of motion (AROM), from 12 lame client-owned English bulldogs with post-CCLR stifle joint abnormalities. The 12 affected subjects were treated with 4 intra-articular injections of PRP, at 30-day intervals...
2018: PloS One
https://www.readbyqxmd.com/read/29534999/diverse-signalling-of-the-platelet-p2y-1-receptor-leads-to-a-dichotomy-in-platelet-function
#7
Richard T Amison, Shirin Jamshidi, Khondaker M Rahman, Clive P Page, Simon C Pitchford
Platelet P2Y1 receptor signalling via RhoGTPases is necessary for platelet-dependent leukocyte recruitment, where no platelet aggregation is observed. We investigated signalling cascades involved in distinct P2Y1 -dependent platelet activities in vitro, using specific inhibitors for phospholipase C (PLC) (U73122, to inhibit the canonical pathway), and RhoGTPases: Rac1 (NSC23766) and RhoA (ROCK inhibitor GSK429286). Human platelet rich plasma (for platelet aggregation) or isolated washed platelets (for chemotaxis assays) was treated with U73122, GSK429286 or NSC23766 prior to stimulation with adenosine diphosphate (ADP) or the P2Y1 specific agonist MRS2365...
May 15, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29411322/the-role-of-biologic-therapy-in-rotator-cuff-tears-and-repairs
#8
REVIEW
Michael D Charles, David R Christian, Brian J Cole
PURPOSE OF REVIEW: The purpose of this review was to establish the foundation of the major biologic adjuvants to rotator cuff repairs and review recent scientific findings. RECENT FINDINGS: Platelet-rich plasma (PRP) overall has no significant impact on functional outcomes and repair integrity, but may be more advantageous in small to medium tears. Further studies should focus on leukocyte-rich versus poor preparations and the use of PRP in patients that are high risk for repair failure...
March 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29337592/concentrations-of-blood-components-in-commercial-platelet-rich-plasma-separation-systems-a-review-of-the-literature
#9
Bart W Oudelaar, Joost C Peerbooms, Rianne Huis In 't Veld, Anne J H Vochteloo
BACKGROUND: Platelet-rich plasma (PRP) has proven to be a very safe therapeutic option in the treatment of tendon, muscle, bone, and cartilage injuries. Currently, several commercial separation systems are available for the preparation of PRP. The concentrations of blood components in PRP among these separation systems vary substantially. PURPOSE: To systematically review and evaluate the differences between the concentrations of blood components in PRP produced by various PRP separation systems...
January 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29316815/effect-of-l-prp-treatment-on-wound-healing-after-surgical-skin-incision-in-an-experimental-animal-model
#10
Agata Cieślik-Bielecka, Marcin Pierchała, Aleksandra Królikowska, Paweł Reichert
AIM OF THE STUDY: The aim of the study was to evaluate the effect of leukocyte- and platelet-rich plasma (L-PRP) treatment on a noncomplicated would healing after surgical skin incision in an experimental animal model. MATERIALS AND METHODS: The blood from 64 male Wistar rats was used to prepare L-PRP before a transverse dorsal incision was made and consecutively closed. At the same time after the surgery was completed, autologous L-PRP in the rats from the L-PRP group (n = 32) and NaCl in the control group (n = 32) were injected subcutaneously into the wound...
January 9, 2018: Connective Tissue Research
https://www.readbyqxmd.com/read/29313321/the-matrix-synthesis-and-anti-inflammatory-effect-of-autologous-leukocyte-poor-platelet-rich-plasma-in-human-cartilage-explants
#11
Mario Simental-Mendía, Félix Vilchez-Cavazos, Rubén García-Garza, Jorge Lara-Arias, Roberto Montes-de-Oca-Luna, Salvador Said-Fernández, Herminia G Martínez-Rodríguez
OBJECTIVE: To determine the effects of autologous leukocyte-poor platelet-rich plasma (LP-PRP) on the expression of markers involved in cartilage-extracellular matrix production and inflammation in cartilage explants bearing osteoarthritis. MATERIALS AND METHODS: Cartilage explants and LP-PRP were obtained from 10 patients who underwent total knee arthroplasty. The explants were cultured in spinner flasks for 28 days in the presence of interleukin (IL)-1β and/or LP-PRP...
January 9, 2018: Histology and Histopathology
https://www.readbyqxmd.com/read/29211968/men-and-women-differ-in-the-biochemical-composition-of-platelet-rich-plasma
#12
Grace Xiong, Nithya Lingampalli, Jayme C B Koltsov, Lawrence L Leung, Nidhi Bhutani, William H Robinson, Constance R Chu
BACKGROUND: Autologous platelet-rich plasma (PRP) is widely used for a variety of clinical applications. However, clinical outcome studies have not consistently shown positive effects. The composition of PRP differs based on many factors. An improved understanding of factors influencing the composition of PRP is important for the optimization of PRP use. HYPOTHESIS: Age and sex influence the PRP composition in healthy patients. STUDY DESIGN: Controlled laboratory study...
February 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29209937/sugar-based-collagen-membrane-cross-linking-increases-barrier-capacity-of-membranes
#13
Po-Ju Chia-Lai, Anna Orlowska, Sarah Al-Maawi, Andre Dias, Yunxin Zhang, Xuejiu Wang, Niklas Zender, Robert Sader, C James Kirkpatrick, Shahram Ghanaati
OBJECTIVES: This study examines the permeability and barrier capacity of a sugar cross-linked resorbable collagen membrane ex vivo and in vivo. MATERIALS AND METHODS: In an ex vivo study, injectable platelet-rich fibrin (i-PRF), a peripheral blood-derived human leukocyte-and-platelet-rich plasma was used to analyze membrane permeability. in vivo subcutaneous implantation in Wistar rats (n = 4 per time point and group) was used to investigate the barrier capacity of the membrane...
December 6, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29207216/the-roles-of-cellular-and-molecular-components-of-a-hematoma-at-early-stage-of-bone-healing
#14
REVIEW
Hoi Ting Shiu, Ping Chung Leung, Chun Hay Ko
Bone healing is a complex repair process that commences with the formation of a blood clot at the injured bone, termed hematoma. It has evidenced that a lack of a stable hematoma causes delayed bone healing or non-union. The hematoma at the injured bone constitutes the early healing microenvironment. It appears to dictate healing pathways that ends in a regenerative bone. However, the hematoma is often clinically removed from the damaged site. Conversely, blood-derived products have been used in bone tissue engineering for treating critical sized defects, including fibrin gels and platelet-rich plasma...
December 5, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29194097/an-autologous-leukocyte-reduced-platelet-rich-plasma-therapy-for-chronic-injury-of-the-medial-collateral-ligament-in-the-knee-a-report-of-3-successful-cases
#15
Mamoru Yoshida, Keishi Marumo
Some patients complain of chronic persistent medial knee pain after isolated low-grade injuries of medial collateral ligaments (MCL). These injuries often respond to various conservative treatments but insufficient healing of ligaments is believed to be responsible for symptoms in this group of patients. We report on successful treatment of chronically symptomatic MCL injuries in 3 patients using autologous leukocyte-reduced platelet-rich plasma (PRP) injections. There were 3 men with a mean age of 39.3 years and a mean disease duration of 10 months...
November 29, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29164165/platelet-rich-plasma-for-primary-treatment-of-partial-ulnar-collateral-ligament-tears-mri-correlation-with-results
#16
J Banks Deal, Ed Smith, Wendell Heard, Michael J O'Brien, Felix H Savoie
Background: Jobe revolutionized the treatment of medial ulnar collateral ligament (MUCL) tears with his reconstruction technique. However, not all MUCL injuries require operative management; Rettig showed that 42% of MUCL injuries respond to conservative management. This was improved by Podesta, who showed that augmentation of nonoperative management with platelet-rich plasma (PRP) and magnetic resonance imaging (MRI) for detecting partial MUCL tears resulted in significantly higher success rates...
November 2017: Orthopaedic Journal of Sports Medicine
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
#17
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...
April 2018: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/29125811/does-leukocyte-poor-or-leukocyte-rich-platelet-rich-plasma-applied-with-biopolymers-have-superiority-to-conventional-platelet-rich-plasma-applications-on-chondrocyte-proliferation
#18
Duygu Yaşar Şirin, İbrahim Yılmaz, Mehmet İsyar, Kadir Öznam, Mahir Mahiroğulları
OBJECTIVES: This study aims to investigate the possible effects of leukocyte concentration in the content of platelet-rich plasma (PRP) and the administration of PRP using a drug delivery system on chondrocyte proliferation in vitro conditions. PATIENTS AND METHODS: Blood from nine male patients (mean age 65 years; range 49 to 81 years) with advanced stage osteoarthritis who had not responded to medical or conservative treatments and underwent total knee arthroplasty was used to prepare two formulations: PRP with low concentration leukocytes (2000-4000 leukocytes/µL) was designated as pure PRP (P-PRP), whereas PRP with high concentration leukocytes (9000-11000 leukocytes/µL) as leukocyte-rich PRP (L-PRP)...
December 2017: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
https://www.readbyqxmd.com/read/29099894/effects-of-platelet-rich-plasma-and-indomethacin-on-biomechanics-of-rotator-cuff-repair
#19
Molly C Meadows, David M Levy, Christopher M Ferry, Thomas R Gardner, Takeshi Teratani, Christopher S Ahmad
We conducted a study to determine if platelet-rich plasma (PRP) enhances the strength of rotator cuff repair (RCR) and if concomitant use of nonsteroidal anti-inflammatory drugs (NSAIDs) affects PRP efficacy. We also wanted to determine the optimal centrifugation protocol for making PRP from rats. This study used 48 rats, 14 in a centrifugation protocol and 34 in an operative protocol. Six syngeneic rats from the operative group were used as PRP blood donors; the other 28 operative rats underwent bilateral RCRs...
September 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/29096373/distribution-recovery-and-concentration-of-platelets-and-leukocytes-in-l-prp-prepared-by-centrifugation
#20
Bruna Alice Gomes de Melo, Andréa Arruda Martins Shimojo, Amanda Gomes Marcelino Perez, José Fabio Santos Duarte Lana, Maria Helena Andrade Santana
Platelet-rich plasma (PRP) is an autologous product prepared from whole blood (WB) that is widely used in regenerative medicine. In clinical practice, discontinuous centrifugation is used for both hand- and machine-prepared PRP. However, separation of WB fractions via centrifugation is a complex process, and the lack of clear mechanisms limits the understanding and evaluation of PRP preparation methods This paper focuses on the distribution, recovery and concentration factor of platelets and leukocytes in L-PRP (leukocyte and platelet-rich plasma) to define a concentration pattern for these blood components due to centrifugation conditions...
January 1, 2018: Colloids and Surfaces. B, Biointerfaces
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