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Citrinin mycotoxicosis in the rabbit: ultrastructural alterations
Abstract:
Citrinin was given to rabbits as a single oral dose of 120 or 67 mg/kg. Rabbits were killed at 4, 6, 8, 10, and 12 hours post dosing, and the kidneys were fixed by intravascular perfusion. Ultrastructural alterations were evident by 4 hours after treatment. In the proximal tubule, alterations were brush border disruption, cytoplasmic rarefaction, and swelling of interdigitating processes. At higher doses, mitochondria were condensed and distorted. Medullary and straight cortical distal tubules had marked distention of the intercellular spaces and disorganization of interdigitating processes. Changes in cortical and outer medullary collecting ducts were similar but less severe. Renal alterations were suggestive of damage to membrane structure and/or transport functions and interference with cellular bioenergetics. Leukocytic infiltration was associated with damaged tubules indicating a contribution of inflammation to the development of the lesions.
Insights
Citrinin exposure in rabbits caused significant kidney damage, including proximal tubule and distal tubule alterations. These changes suggest membrane dysfunction and impaired cellular energy production, with inflammation contributing to the lesions.
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.
