The effect of natural products in animal models of temporomandibular disorders.

Treatment of temporomandibular disorders (TMD) is a challenge for health care professionals. Therefore, new approaches have been investigated, such as the use of natural products. Objective This systematic review aims to summarize the natural products used in treatment of experimental models of TMD. Methodology A systematic search was performed in the databases Medline, Web of Science, Scopus, Embase, SciELO, LILACS, and Scholar Google databases in January 2020, dating from their inception. Pre-clinical studies with natural products for intervention in experimental TMD were included. Two reviewers independently selected the studies, extracted the data, and evaluated the risk of bias. Results 17 records were selected, and 17 different natural products were found, including three lectins, three plants or algae extracts, three sulfated polysaccharides, three cocoa preparations, and five isolated compounds. Concerning the risk of bias, most studies lacked on randomization and blinding. Nociception induced by phlogistic agents was evaluated in most articles, and in five studies it was associated with analysis of inflammatory parameters. In order to investigate the mechanism of action of the natural products used, eight studies evaluated expression of neural or glial molecular markers. Conclusions 16 of 17 natural products found in this review presented positive results, showing their potential for treatment of TMD. However, the lack of methodological clarity can influence these results.

The effect of natural products in animal models of temporomandibular disorders

Abstract Treatment of temporomandibular disorders (TMD) is a challenge for health care professionals. Therefore, new approaches have been investigated, such as the use of natural products. Objective This systematic review aims to summarize the natural products used in treatment of experimental models of TMD. Methodology A systematic search was performed in the databases Medline, Web of Science, Scopus, Embase, SciELO, LILACS, and Scholar Google databases in January 2020, dating from their inception. Pre-clinical studies with natural products for intervention in experimental TMD were included. Two reviewers independently selected the studies, extracted the data, and evaluated the risk of bias. Results 17 records were selected, and 17 different natural products were found, including three lectins, three plants or algae extracts, three sulfated polysaccharides, three cocoa preparations, and five isolated compounds. Concerning the risk of bias, most studies lacked on randomization and blinding. Nociception induced by phlogistic agents was evaluated in most articles, and in five studies it was associated with analysis of inflammatory parameters. In order to investigate the mechanism of action of the natural products used, eight studies evaluated expression of neural or glial molecular markers. Conclusions 16 of 17 natural products found in this review presented positive results, showing their potential for treatment of TMD. However, the lack of methodological clarity can influence these results.

Hydroalcoholic extract of Brazilian red propolis exerts protective effects on acetic acid-induced ulcerative colitis in a rodent model.

Ulcerative colitis (UC) is a common intestinal inflammatory disease with an etiology that is not well understood. Although the anti-inflammatory and anti-oxidant effects of the hydroalcoholic extract of Brazilian red propolis (HERP) have been reported in various experimental models, its protective effect in models of UC have not been evaluated. The purpose of this study was to investigate the chemopreventive effect of hydroalcoholic extract of Brazilian red propolis (HERP) in acetic acid-induced colitis (AAIC) using a rodent model. The HERP was chemically characterised by HPLC/DAD analyses. Male rats were randomly assigned into four groups: sham, vehicle (with AAIC, treated with vehicle), P10 (with AAIC, treated with 10mg/kg HERP), and P100 (with AAIC, treated with 100mg/kg HERP). Treatments were performed for 7days, and colitis was induced on day seven. Animals were euthanized 24h after colitis induction and body weight, colon length, gross and histological scores, malondialdehyde (MDA) and myeloperoxidase (MPO) concentrations in colon tissue, and the immunohistochemical expression of inducible nitric oxide synthase (iNOS) were assessed. The major compounds found in HERP were liquiritigenin (68.8mg/g), formononetin (54.29mg/g), biochanin A (30.97mg/g), and daidzein (19.90mg/g). Rats treated with 10mg/kg HERP demonstrated significant decreases in MPO concentrations, gross and histological scores of tissue damage, and iNOS expression (p<0.05). Similarly, rats treated with 100mg/kg HERP demonstrated significant decreases in MPO levels (p<0.05) and histological scores of tissue damage (p<0.05). The results of this study indicate that oral administration of HERP attenuates AAIC in rats, which may be due to anti-inflammatory effects related to iNOS inhibition.