Growth Factor and Catabolic Cytokine Concentrations Are Influenced by the Cellular Composition of Platelet-Rich Plasma

Department of Clinical Sciences, Cornell University, Ithaca, NY 14853, USA.
The American Journal of Sports Medicine (Impact Factor: 4.36). 08/2011; 39(10):2135-40. DOI: 10.1177/0363546511417792
Source: PubMed


Previous studies of bioactive molecules in platelet-rich plasma (PRP) have documented growth factor concentrations that promote tissue healing. However, the effects of leukocytes and inflammatory molecules in PRP have not been defined.
The hypothesis for this study was that the concentration of growth factors and catabolic cytokines would be dependent on the cellular composition of PRP.
Controlled laboratory study.
Platelet-rich plasma was made from 11 human volunteers using 2 commercial systems: Arthrex ACP (Autologous Conditioned Plasma) Double Syringe System (PRP-1), which concentrates platelets and minimizes leukocytes, and Biomet GPS III Mini Platelet Concentrate System (PRP-2), which concentrates both platelets and leukocytes. Transforming growth factor-β1 (TGF-β1), platelet-derived growth factor-AB (PDGF-AB), matrix metalloproteinase-9 (MMP-9), and interleukin-1β (IL-1β) were measured with enzyme-linked immunosorbent assay (ELISA).
The PRP-1 system consisted of concentrated platelets (1.99×) and diminished leukocytes (0.13×) compared with blood, while PRP-2 contained concentrated platelets (4.69×) and leukocytes (4.26×) compared with blood. Growth factors were significantly increased in PRP-2 compared with PRP-1 (TGF-β1: PRP-2 = 89 ng/mL, PRP-1 = 20 ng/mL, P < .05; PDGF-AB: PRP-2 = 22 ng/mL, PRP-1 = 6.4 ng/mL, P < .05). The PRP-1 system did not have a higher concentration of PDGF-AB compared with whole blood. Catabolic cytokines were significantly increased in PRP-2 compared with PRP-1 (MMP-9: PRP-2 = 222 ng/mL, PRP-1 = 40 ng/mL, P < .05; IL-1β: PRP-2 = 3.67 pg/mL, PRP-1 = 0.31 pg/mL, P < .05). Significant, positive correlations were found between TGF-β1 and platelets (r(2) = .75, P < .001), PDGF-AB and platelets (r(2) = .60, P < .001), MMP-9 and neutrophils (r(2) = .37, P < .001), IL-1β and neutrophils (r(2) = .73, P < .001), and IL-1β and monocytes (r(2) = .75, P < .001).
Growth factor and catabolic cytokine concentrations were influenced by the cellular composition of PRP. Platelets increased anabolic signaling and, in contrast, leukocytes increased catabolic signaling molecules. Platelet-rich plasma products should be analyzed for content of platelets and leukocytes as both can influence the biologic effects of PRP.
Depending on the clinical application, preparations of PRP should be considered based on their ability to concentrate platelets and leukocytes with sensitivity to pathologic conditions that will benefit most from increased platelet or reduced leukocyte concentration.

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    • "Despite the wealth of recent publications, many uncertainties persist regarding the use of PRP to treat disorders of bone and cartilage [9]. A key issue is the variability in the composition of PRP [10] [11]. The platelet concentration in PRP varies 5-fold across studies (from 300,000/mm 3 to over 1,500,000/mm 3 ). "
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    ABSTRACT: Platelet-rich plasma (PRP) has been generating considerable attention as an intra-articular treatment to alleviate the symptoms of osteoarthritis. Activated platelets release a host of soluble mediators such as growth factors and cytokines, thereby inducing complex interactions that vary across tissues within the joint. In vivo, PRP may promote chondrocyte proliferation and differentiation. The available data are somewhat conflicting regarding potential effects on synovial cells and angiogenesis modulation. PRP probably exerts an early anti-inflammatory effect, which may be chiefly mediated by inhibition of the NF-κB pathway, a hypothesis that requires confirmation by proof-of-concept studies. It is far too early to draw conclusions about the efficacy of PRP as a treatment for hip osteoarthritis. The only randomized trial versus hyaluronic acid showed no significant difference in effects, and no placebo-controlled trials are available. Most of the randomized trials in knee osteoarthritis support a slightly greater effect in alleviating the symptoms compared to visco-supplementation, most notably at the early stages of the disease, although only medium-term data are available. Many uncertainties remain, however, regarding the best administration regimen. Serious adverse effects, including infections and allergies, seem rare, although post-injection pain is more common than with other intra-articular treatments for osteoarthritis. Copyright © 2015 Société française de rhumatologie. Published by Elsevier SAS. All rights reserved.
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    • "In general, a high content of leukocyte has been associated with antimicrobial activity, as studies have shown that L- PRP has a negative effect on the growth of Staphylococcus aureus and Escherichia coli in vitro [31]. A L-PRP is also associated with a greater presence of catabolic cytokines as matrix metalloproteinase-9 (MMP-9) and interleukin-1 beta (IL-1beta) [32] [33] as well as a greater number of platelets. As a consequence, a theoretical greater content of growth factors like PDGF and TGF-beta is linked to L-PRP. "
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    ABSTRACT: The convincing background of the recent studies, investigating the different potentials of platelet-rich plasma, offers the clinician an appealing alternative for the treatment of cartilage lesions and osteoarthritis. Recent evidences in literature have shown that PRP may be helpful both as an adjuvant for surgical treatment of cartilage defects and as a therapeutic tool by intra-articular injection in patients affected by osteoarthritis. In this review, the authors introduce the trophic and anti-inflammatory properties of PRP and the different products of the available platelet concentrates. Then, in a complex scenario made of a great number of clinical variables, they resume the current literature on the PRP applications in cartilage surgery as well as the use of intra-articular PRP injections for the conservative treatment of cartilage degenerative lesions and osteoarthritis in humans, available as both case series and comparative studies. The result of this review confirms the fascinating biological role of PRP, although many aspects yet remain to be clarified and the use of PRP in a clinical setting has to be considered still exploratory.
    No preview · Article · May 2015
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    • "Despite the wealth of recent publications, many uncertainties persist regarding the use of PRP to treat disorders of bone and cartilage [9]. A key issue is the variability in the composition of PRP [10] [11]. The platelet concentration in PRP varies 5-fold across studies (from 300,000/mm 3 to over 1,500,000/mm 3 ). "

    Full-text · Article · Mar 2015
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