Behavioral Changes During Development of Chronic Kidney Disease in Rats

Area of Science:

• Nephrology
• Neuroscience
• Behavioral Science

Background:

• Decreased renal function in chronic kidney disease (CKD) is linked to anxiety and cognitive decline, particularly in late-stage patients.
• Existing research primarily focuses on dialysis patients, with limited experimental and causal studies on early CKD stages.
• The relationship between renal dysfunction and cognitive impairment requires further investigation in preclinical models.

Purpose of the Study:

• To investigate dynamic changes in behavioral traits during the progression of CKD in an animal model.
• To assess locomotor activity, anxiety-like behavior, and memory function in rats following CKD induction.
• To correlate behavioral changes with biochemical and histological markers of CKD severity.

Main Methods:

• CKD was induced in male rats via subtotal (5/6) nephrectomy.
• Behavioral assessments included open field, light-dark box, and novel object recognition tests at 2, 4, and 6 months post-surgery.
• Renal function was monitored using blood urea nitrogen (BUN), creatinine (CREAT), and urine albumin-to-creatinine ratio (ACR), alongside renal histology.

Main Results:

• Nephrectomized rats showed significantly elevated BUN, CREAT, and ACR levels, confirming progressive kidney dysfunction.
• While transient changes in locomotor activity (reduced distance and center time) were observed at 2 and 4 months, ambulation returned to baseline by 6 months.
• No significant differences in anxiety-like behavior or memory function were detected between CKD and control rats throughout the study period.

Conclusions:

• Despite developing significant kidney dysfunction, the 5/6 nephrectomy model did not induce persistent changes in anxiety-like behavior or memory function in rats.
• Transient alterations in locomotor activity were observed but normalized over time.
• Further research is necessary to determine if behavioral abnormalities in CKD are linked to disease severity or psychosocial factors in end-stage renal disease.