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Effect of Low-level Laser Therapy on Propylthiouracil-induced Hypothyroidism Model Mice: A Pilot Study

  • Mun, In Kwon (Department of Otolaryngology-Head and Neck Surgery, Dankook University College of Medicine) ;
  • Yoo, Won Sang (Department of Internal Medicine, Dankook University college of Medicine) ;
  • Lee, Sang Joon (Department of Otolaryngology-Head and Neck Surgery, Dankook University College of Medicine) ;
  • Chung, Phil-Sang (Department of Otolaryngology-Head and Neck Surgery, Dankook University College of Medicine) ;
  • Woo, Seung Hoon (Department of Otolaryngology-Head and Neck Surgery, Dankook University College of Medicine)
  • Received : 2020.10.27
  • Accepted : 2020.12.03
  • Published : 2021.03.31

Abstract

Background and Objectives Hypothyroidism is the most common endocrine disease. On the other hand, there is no treatment that can improve the thyroid function. Low-level laser therapy (LLLT) can improve the cellular activity. The effect of hypothyroidism is not obvious. This study examined the effects of LLLT on the thyroid gland function of a propylthiouracil (PTU)-induced hypothyroidism mouse model. Materials and Methods Twenty-five male ICR mice were distributed into five groups of five animals each: Negative control (none PTU animal) and positive control (PTU animal) of unirradiated animals, and three experimental groups with LLLT (3J, 6J, and 12J). Each mouse was exposed to a distinct dose of a 632-nm laser once a week for three rounds. The positive control group and three LLLT groups were induced into a hypothyroidism state by PTU administration. The animals' thyroid-stimulating hormone and thyroxine levels were measured using an ELISA kit, and their thyroid tissue was harvested and analyzed after sacrifice at the end of the experiment. The hormone level and morphological changes in the tissue of the five groups were compared. Results The thyroid hormone levels in the control group and LLLT groups were similar. On the other hand, the thyroid tissue of the LLLT groups showed some morphological changes that were similar to those of iodine deficiency thyroid. Conclusion LLLT did not affect the thyroid gland function in PTU-induced hypothyroidism mice.

Keywords

Acknowledgement

This work was supported through the National Research Foundation of Korea (NRF-2020R1I1A3072797).

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