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In vivo retention and bioactivity of IL-1ra microspheres in the rat intervertebral disc: a preliminary investigation

BACKGROUND: Inflammatory cytokines such as interleukin-1 beta (IL-1β) contribute to the progression of intervertebral disc degeneration. Previously we demonstrated, in vitro, that by delivering interleukin-1 receptor antagonist (IL-1ra) from poly(lactic co-glycolic acid) (PLGA) microspheres, we coul...

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Autores principales: Gorth, Deborah J, Martin, John T, Dodge, George R, Elliott, Dawn M, Malhotra, Neil R, Mauck, Robert L, Smith, Lachlan J
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4545798/
https://www.ncbi.nlm.nih.gov/pubmed/26914760
http://dx.doi.org/10.1186/s40634-014-0015-8
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author Gorth, Deborah J
Martin, John T
Dodge, George R
Elliott, Dawn M
Malhotra, Neil R
Mauck, Robert L
Smith, Lachlan J
author_facet Gorth, Deborah J
Martin, John T
Dodge, George R
Elliott, Dawn M
Malhotra, Neil R
Mauck, Robert L
Smith, Lachlan J
author_sort Gorth, Deborah J
collection PubMed
description BACKGROUND: Inflammatory cytokines such as interleukin-1 beta (IL-1β) contribute to the progression of intervertebral disc degeneration. Previously we demonstrated, in vitro, that by delivering interleukin-1 receptor antagonist (IL-1ra) from poly(lactic co-glycolic acid) (PLGA) microspheres, we could attenuate the degradative effects of IL-1β on the nucleus pulposus (NP) for up to 20 days. The objective of this study was to undertake a preliminary investigation into whether microspheres could be successfully delivered to and retained in the disc in vivo, and whether IL-1ra released from those microspheres remained biologically active. For retention studies, fluorescently-labeled microspheres were delivered to the NPs of rat caudal discs. Rats were sacrificed at time points up to 56 days, and microspheres were localized using fluorescent microscopy. To investigate whether IL-1ra microspheres could effectively inhibit the effects of IL-1β in vivo, four disc levels were allocated to the following treatment groups: intact; saline; IL-1β; or IL-1β + IL-1ra microspheres. Rats were sacrificed after seven days and NP glycosaminoglycan content was measured. FINDINGS: Microspheres were visible in the disc at all time points up to 28 days, and localized to the NP, the annulus fibrosus (AF), or both. Glycosaminoglycan content for discs injected with IL-1β alone was significantly lower than for intact controls. For discs injected with IL-1β along with IL-1ra microspheres, glycosaminoglycan content was not significantly different from intact controls. CONCLUSIONS: Microspheres can successfully be delivered to the disc in vivo and retained for a clinically relevant time frame. IL-1ra released from microspheres can effectively prevent IL-1β-induced NP glycosaminoglycan loss in vivo.
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spelling pubmed-45457982015-08-26 In vivo retention and bioactivity of IL-1ra microspheres in the rat intervertebral disc: a preliminary investigation Gorth, Deborah J Martin, John T Dodge, George R Elliott, Dawn M Malhotra, Neil R Mauck, Robert L Smith, Lachlan J J Exp Orthop Short Report BACKGROUND: Inflammatory cytokines such as interleukin-1 beta (IL-1β) contribute to the progression of intervertebral disc degeneration. Previously we demonstrated, in vitro, that by delivering interleukin-1 receptor antagonist (IL-1ra) from poly(lactic co-glycolic acid) (PLGA) microspheres, we could attenuate the degradative effects of IL-1β on the nucleus pulposus (NP) for up to 20 days. The objective of this study was to undertake a preliminary investigation into whether microspheres could be successfully delivered to and retained in the disc in vivo, and whether IL-1ra released from those microspheres remained biologically active. For retention studies, fluorescently-labeled microspheres were delivered to the NPs of rat caudal discs. Rats were sacrificed at time points up to 56 days, and microspheres were localized using fluorescent microscopy. To investigate whether IL-1ra microspheres could effectively inhibit the effects of IL-1β in vivo, four disc levels were allocated to the following treatment groups: intact; saline; IL-1β; or IL-1β + IL-1ra microspheres. Rats were sacrificed after seven days and NP glycosaminoglycan content was measured. FINDINGS: Microspheres were visible in the disc at all time points up to 28 days, and localized to the NP, the annulus fibrosus (AF), or both. Glycosaminoglycan content for discs injected with IL-1β alone was significantly lower than for intact controls. For discs injected with IL-1β along with IL-1ra microspheres, glycosaminoglycan content was not significantly different from intact controls. CONCLUSIONS: Microspheres can successfully be delivered to the disc in vivo and retained for a clinically relevant time frame. IL-1ra released from microspheres can effectively prevent IL-1β-induced NP glycosaminoglycan loss in vivo. Springer Berlin Heidelberg 2014-11-21 /pmc/articles/PMC4545798/ /pubmed/26914760 http://dx.doi.org/10.1186/s40634-014-0015-8 Text en © Gorth et al.; licensee Springer. 2014 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
spellingShingle Short Report
Gorth, Deborah J
Martin, John T
Dodge, George R
Elliott, Dawn M
Malhotra, Neil R
Mauck, Robert L
Smith, Lachlan J
In vivo retention and bioactivity of IL-1ra microspheres in the rat intervertebral disc: a preliminary investigation
title In vivo retention and bioactivity of IL-1ra microspheres in the rat intervertebral disc: a preliminary investigation
title_full In vivo retention and bioactivity of IL-1ra microspheres in the rat intervertebral disc: a preliminary investigation
title_fullStr In vivo retention and bioactivity of IL-1ra microspheres in the rat intervertebral disc: a preliminary investigation
title_full_unstemmed In vivo retention and bioactivity of IL-1ra microspheres in the rat intervertebral disc: a preliminary investigation
title_short In vivo retention and bioactivity of IL-1ra microspheres in the rat intervertebral disc: a preliminary investigation
title_sort in vivo retention and bioactivity of il-1ra microspheres in the rat intervertebral disc: a preliminary investigation
topic Short Report
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4545798/
https://www.ncbi.nlm.nih.gov/pubmed/26914760
http://dx.doi.org/10.1186/s40634-014-0015-8
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