Increased BDNF levels in long-term bipolar disorder patients

Area of Science:

• Neuroscience
• Psychiatry
• Biochemistry

Background:

• Bipolar disorder (BD) is a chronic and progressive neurological illness.
• Brain-derived neurotrophic factor (BDNF) is implicated in the pathophysiology of BD.

Purpose of the Study:

• To investigate BDNF plasma levels in long-term BD patients versus controls.
• To assess the relationship between BDNF levels and illness characteristics in BD.

Main Methods:

• Enrolled 87 BD type I patients and 58 controls, matched for demographics.
• Assessed participants using the Mini-International Neuropsychiatric Interview, Young Mania Rating Scale, and Hamilton Depression Rating Scale.
• Quantified plasma BDNF levels using ELISA.

Main Results:

• BD patients had a mean illness duration of 23.4 years.
• BD patients in manic or remission states exhibited significantly higher BDNF plasma levels (1.90-fold and 1.64-fold increases, respectively) compared to controls.
• BDNF levels were not correlated with age, illness duration, or medication.

Conclusions:

• Long-term bipolar disorder is associated with increased circulating BDNF levels.
• Elevated BDNF may serve as a potential biomarker for chronic BD.