Evaluation of lipolysis and toxicological parameters of low-level laser therapy at different wavelengths and doses in the abdominal subcutaneous tissue

• Published in: Lasers in medical science Vol. 37; no. 2; pp. 1235 - 1244
• Main Authors: Martins, Marcia Gerhardt, Martins, Maria Isabel Morgan, de Souza, Alessandra Hubner, Antunes, Flavia Tasmin Techera, Pail, Priscilla Batista, de Fátima Wiilland, Elenir, Picada, Jaqueline Nascimento, da Silva Brum, Lucimar Filot
• Format: Journal Article
• Language: English
• Published: London Springer London 01.03.2022; Springer Nature B.V
• Subjects: Abdomen; Adipocytes; Alanine; Alanine transaminase; Alkaline phosphatase; Animals; Aspartate aminotransferase; Aspartate Aminotransferases - metabolism; Aspartate Aminotransferases - pharmacology; Body weight; Bone marrow; Catalase; Cholesterol; Density; Dentistry; Female; High density lipoprotein; Lasers; Lipolysis; Liver; Liver - pathology; Low density lipoprotein; Low-Level Light Therapy - adverse effects; Medicine; Medicine & Public Health; Optical Devices; Optics; Original Article; Parameters; Peripheral blood; Photonics; Quantum Optics; Rats; Rats, Wistar; Subcutaneous Tissue; Thiobarbituric acid; Tissues; Transaminases; Triglycerides; Wavelength; Wavelengths; Red laser; Mutagenicity; Cholesterol; Lipolysis; Infra-red laser
• ISSN: 0268-8921; 1435-604X
• DOI: 10.1007/s10103-021-03378-y

Investigate the effects of low-level lasers therapy (LLLT) aiming abdominal lipolysis. Female Wistar rats received applications of LLLT directly in the abdominal skin twice a week (5 weeks). Except the control group ( n  = 5), animals received treatments with red wavelength 660 nm being (I) R3.3 group ( n  = 5): 3.3 J/cm 2 , and (II) R5 group ( n  = 5): 5 J/cm 2 , or infrared wavelength 808 nm being (III) IR3.3 group ( n  = 5): 3.3 J/cm 2 , and (IV) IR5 group ( n  = 5): 5 J/cm 2 . Abdominal subcutaneous and liver tissues were evaluated histologically. Levels of thiobarbituric acid reactive substances (TBARS) and catalase (CAT) activity were analyzed in liver tissue. In the peripheral blood aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), high-density lipoprotein (HDL), low-density lipoprotein (LDL), triglycerides, and total cholesterol were investigated. Micronucleus assay was performed in the bone marrow. Except for the IR3.3 group, all treated groups reduced the body weight ( p  < 0.001). The R5 group reduced the abdominal subcutaneous tissue weight and thickness ( p  < 0.05), even though all treated groups reduced the number of adipocytes and its size ( p  < 0.001). No histological changes in the liver. There were no alterations in the triglycerides and LDL levels. The IR5 group increased the total cholesterol levels and decreased the HDL, ALT (both p  < 0.05), and AST levels ( p  < 0.001). The group IR3.3 showed higher levels of ALP ( p  < 0.01). The R3.3 group increased the TBARS and CAT activity ( p  < 0.05). No mutagenic effects were found. The red laser treatment at 5 J/cm 2 led to lipolysis and did not alter the liver’s parameters.