In vitro effects of platelet-rich gel supernatants on histology and chondrocyte apoptosis scores, hyaluronan release and gene expression of equine cartilage explants challenged with lipopolysaccharide.
Authors: Carmona Jorge U, Ríos Diana L, López Catalina, Álvarez María E, Pérez Jorge E, Bohórquez Mabel E
Journal: BMC veterinary research
Summary
# Editorial Summary Platelet-rich plasma therapies dominate equine OA treatment, yet optimal platelet and leukocyte concentrations remain contentious; this Colombian research team used cartilage explants challenged with lipopolysaccharide (an inflammatory insult mimicking joint disease) to compare whether leukocyte-rich platelet gel (L-PRG) or pure platelet gel (P-PRG) supernatants offered superior chondroprotective effects. Both gel types reduced chondrocyte apoptosis and hyaluronan loss compared to LPS-challenged controls alone, though they measured differences in gene expression patterns—notably, both preparations downregulated NFκβ and MMP-13 expression, critical mediators of cartilage destruction, whilst maintaining favourable COL2A1 expression required for matrix integrity. The findings suggest that leukocyte presence does not necessarily enhance the anti-inflammatory or matrix-protective benefit, challenging the assumption that higher leukocyte counts automatically improve clinical outcomes. For practitioners, these results indicate that standardisation of PRP/PRG formulation towards platelet concentration (rather than pursuing higher leukocyte counts) may yield more predictable therapeutic responses in naturally occurring equine joint disease, though translating in vitro cartilage explant data to living arthritic joints requires cautious interpretation.
Read the full abstract on PubMed
Practical Takeaways
- •Leukocyte content in PRP preparations significantly affects the cartilage response; clinicians should consider whether L-PRG or P-PRG is more appropriate for their intended application in OA management
- •This research helps clarify optimal platelet and leukocyte concentrations for intra-articular use, informing which PRP preparation type may provide superior anti-inflammatory and tissue-protective effects
- •Results provide mechanistic evidence for how different PRP formulations influence cartilage metabolism and breakdown, supporting more targeted treatment protocols
Key Findings
- •L-PRG and P-PRG supernatants demonstrated differential effects on LPS-challenged equine cartilage explants in terms of anti-inflammatory and anabolic responses
- •Study evaluated gene expression of NFkβ, MMP-13, ADAMTS-4, COL1A1, COL2A1, and COMP in treated cartilage explants
- •Leukocyte presence in PRG preparations influenced chondrocyte apoptosis scores and hyaluronan release differently
- •Histological changes and cartilage matrix degradation markers were assessed to compare L-PRG versus P-PRG efficacy