RESUMO
PURPOSE: To determine the percentage of tumoral necrosis and volume after cyanogenic chemotherapy. METHODS: Histopathological findings of 20 Swiss mice inoculated subcutaneously in the left abdominal wall with 0.05 ml of cell suspension containing 2.5 x 105 viable cells of the Ehrlich tumor were evaluated. The tumor response to cyanogenic chemotherapy was determined using a system that comprises two inhibition factors of tumor growth by calculating the percentage of necrosis in the tumor tissue and calculation of tumor volume in treated animals relative to that in control animals. The importance of this system has been validated by the correlation between tumor inhibition in the groups treated with the respective percentages of necrosis. RESULTS: While the control group presented an average of 13.48 ± 14.71% necrosis and average tumor volume of 16.18 ± 10.94, the treated group had an average of 42.02 ± 11.58 and 6.8 ± 3.57, respectively. The tumor inhibition was significantly associated with treatment (p=0.0189). The analysis of necrosis percentage showed a significant prognostic importance (p=0.0001). CONCLUSION: It is concluded that the effect of cyanogenic chemotherapy showed strong inhibitory action of tumor growth, as well as an increase in its area of necrosis. .
Assuntos
Animais , Masculino , Camundongos , Antineoplásicos/uso terapêutico , Carcinoma de Ehrlich/tratamento farmacológico , Carcinoma de Ehrlich/patologia , Nitrilas/uso terapêutico , Carga Tumoral/efeitos dos fármacos , Parede Abdominal , Antineoplásicos/farmacologia , Carcinoma de Ehrlich/metabolismo , Necrose/tratamento farmacológico , Necrose/patologia , Transplante de Neoplasias/métodos , Nitrilas/efeitos adversos , Nitrilas/metabolismo , Distribuição Aleatória , Valores de Referência , Reprodutibilidade dos Testes , Sulfurtransferases/metabolismo , Resultado do TratamentoRESUMO
Diseases like tropical ataxic neuropathy and endemic goitre have been reported to have definite correlation with a chronic ingestion of cassava (Manihot esculenta Crantz). The toxicity of cassava has been attributed to its two cyanogenic glycosides, linamarin and lotaustralin. In this study, an attempt has been made to understand the pattern of changes in certain clinically significant enzymes brought about by the chronic administration of sublethal doses of linamarin to rabbits. The profound elevation in rhodanese activity observed in the linamarin and cyanide treated rabbits indicated the attempt of the tissues to detoxify cyanide. That intact linamarin could be hydrolysed in vivo was a significant finding from the study. The mode of toxicity of linamarin was similar to that of cyanide by producing a gradual shift from aerobic to anaerobic metabolism.