Canine Renal Failure Caused by Ochratoxin A and Citrinin in the Commercial Dog Food

Five dogs with renal failure were referred to the Veterinary Medical Teaching Hospital at Kangwon National University. These dogs had the common history of consumption of Pedigree dry dog food produced in Thailand plant for over 1 month. The dogs showed anorexia, emaciation, vomiting, and polydipsia/polyuria. And in one severely affected dog, bloody diarrhea and hypothermia were seen. The remarkable clinicopathological signs were high value of BUN and creatinine. In some dogs, GGT, phosphorus and lipase were increased. However, no significant changes of complete blood count were found. In urinalysis, hematuria, low specific gravity urine, proteinuria, and calcium oxalate-like crystals were observed. Two severely affected dogs were died. The remained dogs were recovered gradually after change of dog food and supportive therapy. Pathological findings were seen typically in kidneys. Renal atrophy, congestion of the glomerular capillary, and diffuse degeneration, necrosis, dystrophic calcification and regeneration in the tubular epithelium were seen. Yellowish brown fluorolucent laminated materials or particles were quite often found in the lumina of the necrotizing renal tubules of cortex and medulla. Proliferation of fibrous tissue in the interstitium was also seen. By the mycotoxin analysis of the Pedigree dry dog food, ochratoxin A (OTA) and citrinin were detected as much as the concentration of 372.8 ppb and 8.3 ppb, respectively. The final diagnosis of renal failure caused by OTA and citrinin toxicosis was made on the basis of history takings, clinical signs, clinicopathological and pathological findings, and analysis of mycotoxins.

시판 사료에 오염된 Ochratoxin A와 Citrinin에 의한 개의 신부전

태국에서 생산된 Pedigree사의 개 사료를 1개월 이상 섭취한 5마리의 개가 식욕절폐, 쇠약, 구토, 다음다뇨 증상을 보였으며 증상이 심한 개는 혈액성 설사와 저체온증을 보였다. 특징적인 임상병리학적 소견으로 BUN과 creatinine이 높았으며 일부의 개에서는 GGT, 무기인과 lipase가 높았으나 CBC는 특이적인 임상병리학적 소견이 없었다. 요분석에서는 혈뇨, 저비중뇨, 단백뇨와 calcium oxalate와 유사한 결정이 관찰되었다. 증상이 심한 두 마리는 폐사하였으며 나머지의 개는 사료의 변경과 보조요법에 의하여 점차 회복되었다. 전형적인 병리학적 소견은 신장에서 관찰되어 신장의 위축, 일부 사구체의 모세혈관 충혈, 세뇨관의 미만성 변성과 이영양성 석회화, 세뇨관의 괴사와 재생, 세뇨관 내강 내에 황갈색 판상 형광성 물질 또는 파편이 관찰되었다. 섭취한 사료와 동일한 개봉하지 않은 사료 내의 ochratoxin A와 citrinin의 농도를 분석한 결과 각각 372.8ppb와 8.3ppb가 검출되었다. 병력, 임상증상, 임상병리소견, 병리학적 소견 및 사료 내의 곰팡이독소의 분석을 통하여 ochratoxin A와 citrinin의 중독에 의한 신부전으로 최종진단을 내렸다.