RESUMO
The present study evaluated the role of dietary folate modulations in the development of hepatocellular carcinoma (HCC) in a rat model. Male Wistar rats were given diethylnitrosamine (DEN) carcinogen for a period of 18 weeks in addition to different folate modulations. Biochemical parameters were assayed and liver tissues were examined using various histopathological stains viz. Hematoxylin and eosin (H&E), Masson's trichrome, Immunohistochemistry (IHC) staining for arginase-1 and α-smooth muscle actin (SMA). Serum folate and hepatic folate stores were decreased and increased in folate deficiency (FD) and folate oversupplemented (FO) group respectively. Analysis of serum liver function tests revealed deranged liver functioning in all the groups. H&E staining of rat liver demonstrated vague nodularity from 2nd to 8th week, fibrosis from 10th to 15th week, cirrhosis and HCC from 16th to 18th week. Combining the observations of H&E with IHC for arginase-1, 14 (50%), 11 (39.3%) and 17 (58.6%) rats showed HCC positivity in FN (folate normal), FD and FO diets respectively. IHC for α-SMA depicted increased staining with progression of the disease from fibrosis to cirrhosis in all the dietary groups. Collectively, findings of all the histopathological stains, revealed increase in the number of cirrhotic cases and decrease in the number of HCC cases in FD group, indicating delayed progression of HCC with FD. Moreover, FO led to more number of HCC and reduction in the number of cirrhotic cases, signifying early progression of HCC.