How does L-theanine treatment affect the levels of serum and hippocampal BDNF, insulin and adipocytokines in diabetic rats?

Hajizadeh Tekmeh H., Vanizor Kural B., Kör S., Arıkan Malkoç M., Yuluğ E., Kutlu A., ...More

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, vol.667, pp.95-103, 2023 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 667
  • Publication Date: 2023
  • Doi Number: 10.1016/j.bbrc.2023.05.039
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, Chemical Abstracts Core, EMBASE, Food Science & Technology Abstracts, Veterinary Science Database
  • Page Numbers: pp.95-103
  • Keywords: Adipocytokine, Diabetes, Hippocampus, Insulin, L-theanine
  • Karadeniz Technical University Affiliated: Yes


Background: Diabetes Mellitus (DM), a metabolic disease characterized by the increased blood glucose level, insulin deficiency or ineffectiveness, may cause structural and functional disorders in the brain. L- Theanine (LTN) has the relaxing, psychoactive, antidepressant, anti-inflammatory and antinecrotic properties, and regulates the functions of hippocampus (HP) in brain. In the present study, the aim was to identify the effects LTN on the levels of BDNF, insulin and adipocytokines (TNF-a, leptin, adiponectin and resistin) in both HP and serum of diabetic rats. Methods: 32 male Wistar rats were divided into four groups (n 1/4 8/group): Control, LTN, DM and DM thorn LTN. Diabetes was induced by by nicotinamide/streptozotocin. 200 mg/kg/day LTN treatment was applied for 28 days. The serum and hippocampal levels of the parameters were determined by using commercial ELISA kits. Additionally, HP tissues examined histopathologically. Results: LTN treatment significantly decreased leptin and adiponectin levels in HP tissues in diabetic rats (p < 0.05). Although it decreased the insulin level in both serum and HP, this was not statistically sig-nificant. No significant effect on other parameters was observed (p > 0.05). In histopathological analysis, although the damage was reduced by LTN in all sections of HP, this change was significant mainly in CA3 region (p < 0.05). Conclusion: It was concluded that LTN has the ability to reduce hippocampal degeneration and modu-lates adipocytokines in diabetic rats. (c) 2023 Elsevier Inc. All rights reserved.