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Elevation of laminin and beta-subunit of prolyl 4-hydroxylase in the sera of human subjects with Schistosomiasis mansoni.

Serum levels of several markers for liver fibrosis were measured utilizing three groups of human subjects related with schistosomiasis mansoni in northeast Brazil; (1) 20 Schistosoma mansoni egg-positives, who have never been administered with anti-schistosomal drugs, (2) 29 egg-negative inhabitants in the endemic area of schistosomiasis, and (3) 23 egg-negative Japanese immigrants in the non-endemic area. None of these sera were positive for antibody to the surface antigen of human hepatitis B (HBs) and circulating HBs antigen. There was no significant difference in the serum levels of N-terminal peptide of procollagen type-III between the egg-positive subjects and either of the egg-negative Brazilian or Japanese immigrants, whereas the mean value of serum laminin significantly increased in the egg-positive subjects. A significantly higher concentration of serum immunoreactive beta-subunit of prolyl 4-hydroxylase (IR beta PH) was also observed in the egg-positive subjects only in comparison with that of the egg-negative Brazilian. Serum laminin and IR beta PH concentrations of the egg-positive subjects did not correlate with the absorbance of enzyme-linked immunosorbent assay (ELISA) which utilized crude antigens isolated from schistosome adults or eggs. No significant difference in these two parameters was observed between two subgroups of the egg-negative Brazilian or Japanese immigrants divided according to the serological data by ELISA. These findings suggest that serum laminin and IR beta PH levels are worth further evaluation for their usefulness as the marker for liver fibrosis in schistosomiasis.