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Erschienen in: Lasers in Medical Science 3/2022

19.11.2021 | Original Article

Impact of photobiomodulation therapy on the morphological aspects of submandibular gland submitted to excretory duct ligation and hypothyroidism: an animal study

verfasst von: Ana Carolina Lemos Pimentel, Tânia Tavares Rodriguez, Manoela Domingues Martins, Luiz Carlos Ramos Filho, Iago Fonseca Silva Mota, Juliana Santos de Carvalho Monteiro, Patricia Rubia Manieri, Antônio Luiz Barbosa Pinheiro, Patrícia Ramos Cury, Jean Nunes Dos Santos

Erschienen in: Lasers in Medical Science | Ausgabe 3/2022

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Abstract

The aim of this study was to evaluate the impact of photobiomodulation therapy (PBMT) on histomorphological aspects of submandibular gland (SMG) submitted to salivary gland duct obstruction in hypothyroid rats. Fifty-six male Wistar rats (250 to 300 g) were divided into 4 groups (n = 14): euthyroid (EU), EU + PBMT, hypothyroid (HYPO), and HYPO + PBMT. Duct obstruction of the left submandibular gland (LSMG) was performed in all animals by a ligature procedure. For the induction of hypothyroidism, total thyroidectomy was performed. PBMT groups received irradiation with AlGaInP diode laser (808 nm, 0.04 W, 0.04cm2 spot size, 60 s, 2.4 J per point, 60 J/cm2, 1 W/cm2). Irradiation was performed immediately, 24 h, and 48 h after the obstruction of the salivary gland duct, in one point, extra oral and perpendicular to the gland. Animals were sacrificed after 24 h and 72 h after duct ligature. Our results indicated that salivary duct obstruction and hypothyroidism caused negative modifications on the salivary glands’ histomorphology, especially acinar atrophy, after 24 h and 72 h. HYPO + PBMT showed a significant reduction of the inflammatory infiltrate, congested blood vessels, and acinar atrophy in the SMG submandibular salivary gland in 72 h compared to 24 h (p < 0.05). In conclusion, obstruction of the salivary gland excretory duct and hypothyroidism causes severe sialoadenitis with expressive atrophy of the glandular parenchyma. However, PBMT was able to modulate the inflammatory process and delaying acinar atrophy. This study provided insights to better understand the role of the PBMT on the altered salivary gland by duct ligation and associate hypothyroidism.
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Metadaten
Titel
Impact of photobiomodulation therapy on the morphological aspects of submandibular gland submitted to excretory duct ligation and hypothyroidism: an animal study
verfasst von
Ana Carolina Lemos Pimentel
Tânia Tavares Rodriguez
Manoela Domingues Martins
Luiz Carlos Ramos Filho
Iago Fonseca Silva Mota
Juliana Santos de Carvalho Monteiro
Patricia Rubia Manieri
Antônio Luiz Barbosa Pinheiro
Patrícia Ramos Cury
Jean Nunes Dos Santos
Publikationsdatum
19.11.2021
Verlag
Springer London
Erschienen in
Lasers in Medical Science / Ausgabe 3/2022
Print ISSN: 0268-8921
Elektronische ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-021-03463-2

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