title: Intervertebral disc regeneration using platelet-rich plasma and biodegradable gelatin hydrogel microspheres.
abstract: This study evaluated the regenerative effects of platelet-rich plasma (PRP) for the degenerated intervertebral disc (IVD) in vivo. After induction of IVD degeneration in rabbits, we prepared PRP by centrifuging blood obtained from these rabbits. These PRP were injected into the nucleus pulposus (NP) of the degenerated IVDs after impregnation into gelatin hydrogel microspheres that can immobilize PRP growth factors physiochemically and release them in a sustained manner with the degradation of the microspheres. As controls, microspheres impregnated with phosphate-buffered saline (PBS) and PRP without microspheres were similarly injected. Histologically, notable progress in IVD degeneration with time courses was observed in the PBS control, PRP-only, and sham groups. In contrast, progress was remarkably suppressed over the 8-week period in the PRP group. Moreover, in immunohistochemistry, intense immunostaining for proteoglycan in the NP and inner layer of the annulus fibrosus was observed 8 weeks after administration of PRP-impregnated microspheres. Almost all microspheres were indistinct 8 weeks after the injection, and there were no apparent side effects in this study. Our results suggest that the combined administration of PRP and gelatin hydrogel microspheres into the IVD may be a promising therapeutic modality for IVD degeneration.
authors.affiliation: Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
authors.forename: Masateru
authors.initials: M
authors.lastname: Nagae
authors.forename: Takumi
authors.initials: T
authors.lastname: Ikeda
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Mikami
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Hase
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Ozawa
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Matsuda
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Sakamoto
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Tabata
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Kawata
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Kubo
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D001861:Bone Regeneration / Q000502:physiology*; D016503:Drug Delivery Systems; D005780:Gelatin / Q000138:chemical synthesis; D020100:Hydrogels / Q000138:chemical synthesis; D036341:Intercellular Signaling Peptides and Proteins / Q000097:blood; D007403:Intervertebral Disc / Q000473:pathology / Q000503:physiopathology* / Q000648:ultrastructure; D007405:Intervertebral Disc Displacement / Q000097:blood / Q000503:physiopathology / Q000628:therapy*; D008297:Male; D008863:Microspheres; D010976:Platelet Count; D053657:Platelet-Rich Plasma / Q000502:physiology*; D011817:Rabbits
chemical_list: D020100:Hydrogels; D036341:Intercellular Signaling Peptides and Proteins; D005780:Gelatin