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Local administration of curcumin-loaded nanoparticles enhances periodontal repair in vivo

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Abstract

The aim was to assess the influence of local application of curcumin-loaded nanoparticles on an experimental model of periodontal repair. Periodontitis was induced by ligatures on both lower first molars of rats. After 15 days, ligatures were removed (“treatment”) and animals were randomly allocated to three experimental groups (n = 8/group): (i) 0.05 mg/ml curcumin-loaded nanoparticles, (ii) empty nanoparticles (vehicle control), and (iii) sterile saline (negative control). Experimental treatments were administered locally on days 0, 3, 5, 7, 9, and 11 after ligature removal. Animals were euthanized at 7 and 14 days. Bone repair was assessed by microcomputer tomography (µCT). Histological sections were stained with hematoxylin/eosin (H/E), Picrosirius Red, and Masson’s trichrome. Expression of Runx-2 was studied by immunohistochemistry. Gene expression of Itgam, Arg1, and Inos was assessed by RT-qPCR. At 7 days, there was increased gene expression of Itgam and Arg1 and of the relative expression of Arg1/Inos in curcumin-treated animals, but no difference in any other outcomes. At 14 days, curcumin-loaded nanoparticles significantly increased bone repair and collagen content, as well as the number of osteocytes, percentage of extracellular matrix, and expression of Runx2. The results demonstrate that local administration of curcumin-loaded nanoparticles enhanced tissue repair in an experimental model of periodontal repair. Nanoparticle-encapsulated curcumin enhances early post-treatment repair of periodontal tissues.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

This work was supported by the São Paulo Research Foundation (FAPESP 2020/11916-0) and Brazilian National Council for Scientific and Technological Development (CNPq 440588/2014-18).

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Authors and Affiliations

Authors

Contributions

CGPP and NARF conducted experiments, data analyses, manuscript preparation, and writing—review and editing; ACC, DPF, AFS, and MCZ conducted experiments; CFA and FLP—curcumin-loaded nanoparticles synthesis; MRGS—conceptualization and experimental design; CRJ—conceptualization, experimental design, supervision, manuscript preparation, writing—review and editing.

Corresponding author

Correspondence to Carlos Rossa Junior.

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Ethics approval

The experimental protocol was approved by the Ethical Committee for Animal Use (CEUA) of the School of Dentistry at Araraquara − UNESP (protocol number no. 37/2017) and performed in accordance with the guidelines from the National Council for the Control of Animal Experimentation the Brazilian College for Animal Experimentation (CONCEA).

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The authors declare no competing interests.

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Supplementary Information

SI Fig. 1

Bone volume at 7 days. (a) Quantification of the ratio of mineralized tissue (BV/TV). (b) Representative images of each experimental condition. The bars indicate the percentage average value and vertical lines the standard error of the mean (SEM) (PNG 36 kb)

High resolution image (TIF 2809 kb)

SI Fig. 2

Collagen content in the gingival tissues at 7 days. (a) Percentage of collagen content in Picrosirius red-stained samples. (b) Representative images of the picrosirius red staining according to the experimental group (100x magnification). (c) Percentage of collagen content in Masson’s trichrome-stained sections. (d) Representative images of Masson’s trichrome staining according to the experimental group (400x magnification). The bars indicate the percentage average value and vertical lines the standard error of the mean (SEM). (*), (**) and (***) p < 0.05. 1M = first molar; 2M = second molar (PNG 171 kb)

High resolution image (TIF 2809 kb)

SI Fig. 3

Stereometric analysis of the periodontal tissues according to treatments at 7 days (a) Extracellular matrix percentage. (b) Osteocyte density. (c) Cellular infiltrate. (d) Blood vessels. The bars indicate the percentage average value or osteocyte density (osteocyte/mm2) and vertical lines the standard error of the mean (SEM). (***) p < 0.05 (PNG 29 kb)

High resolution image (TIF 2809 kb)

SI Fig. 4

Immunohistochemical analysis of Runx2 according to treatments at 7 days. (a) H-score of cells positively stained with antibodies. (b) Representative images of the immunohistochemistry staining (400x magnification). The bars indicate the percentage average value and vertical lines the standard error of the mean (SEM) (PNG 90 kb)

High resolution image (TIF 2809 kb)

SI Fig. 5

Expression of target genes in the gingival tissues according to treatments at 14 days. Gene expression of (a) Arg1, (b) Inos and (c) Itgam. (d) Relative gene expression of Arg1/Inos. The bars indicate the average value of gene expression and vertical lines the standard error of the mean (SEM) (PNG 34 kb)

High resolution image (TIF 2809 kb)

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Perez-Pacheco, C.G., Fernandes, N.A.R., Camilli, A.C. et al. Local administration of curcumin-loaded nanoparticles enhances periodontal repair in vivo. Naunyn-Schmiedeberg's Arch Pharmacol 396, 311–321 (2023). https://doi.org/10.1007/s00210-022-02310-7

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