A behavioral and molecular study; ameliorated anxiety-like behavior and cognitive dysfunction in a rat model of chronic unpredictable stress treated with oregano extract.

OBJECTIVE: Chronic stress is considered a severe risk factor leading to various disorders, including anxiety and cognitive decline. The present study aimed to investigate the effects of Origanum vulgare (oregano) extract on improving anxiety-like behavior and learning and memory defection caused by chronic unpredictable stress (CUS). METHOD: A 10-day CUS protocol was executed on male rats, and on day 10, their anxiety, learning, and memory status were evaluated. After that, in addition to the CUS, the rats were treated with the oregano extract for 2 weeks. Then, the expression of BDNF, TrkB, and TLR2/4 genes in the hippocampus and prefrontal cortex of the rats was evaluated. Also, the liver- and kidney-related serum parameters, including triglycerides, total cholesterol, HDL, LDL, creatinine, urea, serum glucose, alanine aminotransferase, and aspartate aminotransferase were assessed. Further, the extract's lethal effect and its impact on animals' body weight were investigated. RESULTS: Behavioral tests confirmed the anxiety-like behavior and learning-memory function impairment caused by CUS. In contrast, the administration of the extract could significantly alleviate the mental deficiencies and diminished anxiety-like behaviors. Molecular assessments showed that CUS could markedly decrease the BDNF and TrkB genes' expression levels while increasing that of TLR2 and TLR4. In contrast, in extract-treated animals, mRNA levels of BDNF and TrkB considerably increased, yet TLR2 and TLR4 mRNA levels reduced. Additionally, consumption of the extract caused weight gain, while having no lethality and detrimental effect on the liver and kidneys functions. CONCLUSIONS: These findings indicate the anxiolytic properties of the extract and its improving effect on cognitive dysfunction.

Coronary artery dissection in a 33-year-old man with fatigue and episodic retrosternal burning: a case report.

BACKGROUND: Non-atherosclerotic spontaneous coronary artery dissection (SCAD) is a rare disease that predominantly affects women. It presents with acute chest pain, ventricular arrhythmias, and even sudden cardiac death. CASE SUMMARY: A 33-year-old man presented to emergency department with fatigue and cold sweat. He had no complaint of chest pain at the time of admission. He experienced a retrosternal chest pain 2 days ago after lifting a 30 pounds weight in the gym. Para-clinic results such as coronary computed tomography angiography and electrocardiogram were normal. However, coronary angiography showed multiple coronary dissections. We followed the patient for 4 months. He was asymptomatic except for one episode of chest pain during Tehran earthquake, while he was carrying his child to escape the room. Follow-up myocardial perfusion scan was negative for ischaemia. DISCUSSION: Stressors such as intense exercise, emotional stress, and Valsalva manoeuvre may cause SCAD in otherwise healthy patient. As in our case, lifting heavy weights was the most likely reason for SCAD. Stable patients without ongoing chest pain will be followed conservatively.