Citrinin mycotoxicosis in the rabbit: ultrastructural alterations

Area of Science:

• Nephrotoxicology
• Cellular Biology
• Renal Pathology

Background:

• Citrinin is a mycotoxin with known nephrotoxic potential.
• Understanding the ultrastructural effects of citrinin on kidney tissue is crucial for assessing its toxicity.

Purpose of the Study:

• To investigate the ultrastructural changes in rabbit kidneys following oral administration of citrinin.
• To characterize the temporal progression and dose-dependency of citrinin-induced renal damage.

Main Methods:

• Rabbits received a single oral dose of citrinin (120 or 67 mg/kg).
• Kidneys were harvested at various time points (4-12 hours post-dosing) and fixed via intravascular perfusion.
• Ultrastructural analysis was performed using electron microscopy.

Main Results:

• Early ultrastructural alterations (by 4 hours) included brush border disruption, cytoplasmic rarefaction, and swelling in proximal tubules.
• Higher citrinin doses led to mitochondrial condensation and distortion.
• Distal tubules exhibited intercellular space distention and disorganization; collecting ducts showed similar but less severe changes.
• Renal alterations indicated membrane damage, impaired transport functions, and disrupted cellular bioenergetics.
• Leukocytic infiltration was observed, suggesting an inflammatory component in lesion development.

Conclusions:

• Citrinin induces significant and rapid ultrastructural damage to rabbit kidneys.
• The observed changes point to disruption of membrane integrity, transport mechanisms, and cellular energy metabolism.
• Inflammation plays a role in the pathogenesis of citrinin-induced renal lesions.