Roopam Jain, Preeti Jain, S Sharma, Shivanshu Srivastava, VK Mahadik
Assistant Professor and In-Charge Transfusion Services, R. D. Gardi Medical College, Ujjain
Introduction: Non-healing cutaneous wounds represent a challenging problem and are commonly related to peripheral vascular disease, infection, trauma, neurologic and immunologic conditions, as well as neoplastic and metabolic disorders. As we have learned, growth factors and cytokines are bioactive proteins responsible for attracting macrophages, mesenchymal stem cells and osteoblasts, which not only promotes removal of necrotic tissue but also enhances tissue regeneration and healing. It is widely accepted that growth factors play a central role in the healing process and tissue regeneration. A recent strategy to promote the wound-healing cascade is to prepare autologous mesenchymal stem cells (MSCs), growth factors (GFs) and cytokines, and to administer it to the wound sites. It can affect inflammation, post-operative blood loss, infection, narcotic requirements, osteogenesis, wounds and soft tissue healing. In addition to local hemostasis at sites of vascular injury, this autologous material contains an abundance of growth factors and cytokines that are pivotal in soft tissue healing and bone mineralization. The purpose of this study was to quantitate growth factors released from a prepared platelet concentrate.
Aims and Objectives: (1) Quantification of growth factors by traditional enzyme-linked immunosorbent assay (ELISA) versus advanced bead-based multiplexing technologies in term of sensitivity and reproducibility of results, (2) to access the role of MSCs, GFs and cytokines in the healing process and tissue regeneration, (3) to access the role of MSCs, GFs and cytokines in early wound closure and epithelization and (4) to access the role of MSCs, GFs and cytokines in decreased pain, lower blood loss and fewer narcotic requirements.
Materials and Methods: The blood collection system should be closed, minimizing any opportunity for contamination, and sterile disposables should be used on the selected patients. About 100 ml of whole blood is drawn into the syringe in ACD or CPD, under aseptic techniques from the anticubital. An 18 or 19 g butterfly needle is advised, in efforts of avoiding irritation and trauma to the platelets that are in a resting state. The MSCs, GFs and cytokines are separated from blood by multiple buffering and activation procedures. Quantification of platelet and growth factors was carried out in terms of platelet-derived growth factor (PDGF)-BB, transforming growth factor (TGF)-(beta)1, vascular endothelial growth factor (VEGF), epidermal growth factor (EGF) and insulin-like growth factor (IGF)-1 measurements from whole blood by traditional ELISA versus advanced bead-based multiplexing technologies by assessing the sensitivity and reproducibility of the results. The growth factors applied on the non-healing cutaneous ulcers and the effect of these growth factors have been thoroughly studied.
Results: Quantification of GFs and interleukins was determined for each patient by the traditional ELISA versus fully automated bead-based multiplexing technologies. The PDGF, TGF-(beta)1, VEGF, and EGF cytokines were all significantly greater in the PRP samples than in the whole blood baseline samples by both methods. On average, the PDGF-BB increased from 3.3 ± 0.9 ng/ml to 17 ± 8 ng/ml, TGF-(beta)1 increased from 35.7 ± 7 ng/ml to 120 ± 42 ng/ml, VEGF increased from 155 ± 110 pg/ml to 955 ± 1030 pg/ml and EGF increased from 128 ± 61 pg/ml to 470 ± 317 pg/ml. The increase was calculated per patient for both platelet number and growth factor levels. The greatest increase is seen with VEGF (6.1-fold increase), followed by PDGF-BB (5-fold increase) and EGF and TGF-(beta)1 (4- and 3.7-fold, respectively) by advanced bead-based multiplexing ELISA. Results from this study demonstrate that GFs and cytokines can be sequestered and concentrated 8-fold from whole blood without activation before desired. To understand the better sensitivity/reproducibility of the results, we cross-checked our samples in a fully automated multiplex ELISA.
Conclusion: It is concluded that the fully automated advanced bead-based multiplexing ELISA method is highly sensitive and reproducible, is less time consumable and economic than the traditional ELISA. These GFs and cytokines are capable of decreasing inflammation, post-operative blood loss, infection and narcotic requirements and play a central role in the healing process and tissue regeneration.