Ginkgo biloba Extract (GbE) Restores Serotonin and Leptin Receptor Levels and Plays an Antioxidative Role in the Hippocampus of Ovariectomized Rats

Autor(es):Mostrar menos -

Machado, Meira Maria Forcelini ^[1] ; Banin, Renata Mancini ^[1] ; Thomaz, Fernanda Malanconi ^[1] ; de Andrade, Iracema Senna ^[2] ; Boldarine, Valter Tadeu ^[2] ; de Souza Figueiredo, Jessica ^[1] ; Hirata, Bruna Kelly Sousa ^[1] ; Oyama, Lila Missae ^[2] ; Lago, Joao Henrique Ghilardi ^{[3, 1]} ; Ribeiro, Eliane Beraldi ^[2] ; Telles, Monica Marques ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, Inst Environm Sci Chem & Pharmaceut, Postgrad Program Chem Biol, Diadema, SP - Brazil

^[2] Univ Fed Sao Paulo, Dept Physiol, Discipline Nutr Physiol, Sao Paulo, SP - Brazil

^[3] Univ Fed ABC, Ctr Nat & Human Sci, Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Molecular Neurobiology; v. 58, n. 6, p. 2692-2703, JUN 2021.
• Citações Web of Science: 1

Resumo

Since Ginkgo biloba extract (GbE) was reported to improve the hypothalamic serotonergic system of ovariectomized (OVX) rats, the present study aimed to verify the GbE effects on hippocampal oxidative stress, inflammation, and levels of the serotonin transporter (5-HTT), and both the serotonin (5-HT1A, 5-HT1B) and leptin receptors of OVX rats. Two-month-old female Wistar rats had their ovaries surgically removed (OVX) or not (SHAM). After 60 days, OVX rats were gavaged daily with GbE 500 mg kg(-1) (OVX+GbE), while SHAM and OVX groups received saline 0.9% (vehicle) for 14 days. Rats were then euthanized, and hippocampi were collected. Both 5-HT1A and 5-HT1B levels were significantly reduced in OVX rats compared to SHAM rats, while 5-HT1A was higher in OVX+GbE rats in comparison to OVX rats. Similarly, LepR levels were increased in OVX+GbE rats compared to OVX rats, reaching similar levels to SHAM rats. Superoxide dismutase activity increased in OVX rats in relation to SHAM rats, which was restored to SHAM levels by GbE treatment. Additionally, GbE significantly increased the glutathione peroxidase activity in comparison to the SHAM group. No differences were observed either in catalase activity or in the levels of 5-HTT, PKC alpha, TLR-4, NF-kappa Bp50, ERK, and CREB. In summary, our results show a potential effect of GbE on hippocampal pathways involved in feeding behavior, and thus, they suggest that GbE activity might improve menopausal-related hippocampal disorders, offering an alternative therapeutic tool particularly for women to whom hormone replacement therapy may be contraindicated. (AU)

• Processo FAPESP: 14/18929-9 - Investigação de potenciais mecanismos de ação do extrato padronizado de Ginkgo biloba (EGB) envolvidos na melhora da obesidade e resistência à insulina induzidas por dieta hiperlipídica
• Beneficiário: Monica Marques Telles
• Modalidade de apoio: Auxílio à Pesquisa - Regular