Digestive processes of haematophagous insects. XII. Secretion of trypsin and carboxypeptidase B by Glossina morsitans morsitans Westwood (Diptera: Glossinidae)

There was a significant positive correlation between protein content and the amounts of trypsin and carboxypeptidase B (CPB) in the digestive portion of the midgut of Glossina morsitans morsitans, 24, 48, 72, and 96 h after feeding on a rabbit. CPB and trypsin activity were also positively correlated. Trypsin and CPB production were stimulated, to varying degrees, by bovine serum albumin (BSA), α-globulin, β-globulin, γ-globulin, and haemoglobin; the greatest response was to BSA. Peptides derived from BSA by trypsin cleavage also stimulated production of trypsin and CPB.