Nanostructure characteristics of three types of platelet-rich fibrin biomaterial: a histological and immunohistochemical study

Abstract

Abstract
Background: Platelet-rich fibrin (PRF) is a blood-derived biomaterial that has shown potential in regenerative medicine. The objective of this study was to characterize the structure of fibrin network nanoparticles and cellular components using histological and immunohistochemical techniques. 
Methods: Three different types of PRF were manufactured: Choukri's platelet-rich fibrin (Ch-PRF), pure platelet-rich fibrin (P-PRF), and leukocyte platelet-rich fibrin (L-PRF), according to established protocols. The histological structures of the biomaterials were evaluated using hematoxylin and eosin staining. The fibrin network nanostructure was confirmed by Sirius Red staining and immunohistochemical staining with a fibrinogen antibody. Leukocyte components were identified by immunohistochemical staining using CD45 antibody. 
Results: Histological and immunohistochemical staining of the fibrin network from the PRF biomaterial revealed a natural nanostructure characterized by porous and complex branching networks. The L-PRF and Ch-PRF fibrin networks were delicate and branched, whereas the P-PRF fibrin network displayed thicker bundles of fibers that were sometimes twisted and had noticeable pores. Nonetheless, the proportion of the fibrin network area in all three types of PRF biomaterials was not significantly different. No living cells were found in the P-PRF biomaterials, whereas Ch-PRF and L-PRF contained cells. A large number of red and white blood cells were observed within the Ch-PRF fibrin network, with a non-uniform distribution. The L-PRF biomaterial possesses a uniform structure with a high density of embedded leukocytes.
Conclusions: The use of peripheral blood-derived PRF biomaterials, which mimic the natural structure of fibrin nanostructures and living cell components, offers promising possibilities for tissue engineering and regenerative medicine. Additional investigation is necessary to assess the properties of PRF architecture and its practical application in medical treatment.
Keywords: Peripheral blood, platelet-rich fibrin, biomaterial, scaffold, natural nanostructure.