Insulin-like peptides in the lobster Homarus americanus. III. No glucostatic role.

Lobsters contained insulin immunoreactivity ranging from 3.4 +/- 0.6 to 7.2 +/- 0.5 microU ml-1 hemolymph. Experimental results indicated that the hemolymph insulin immunoreactive peptides have no glucostatic function. With an increase in exogenous glucose in the hemolymph no increase in hemolymph immunoreactive insulin was observed. Also, injection of hepatopancreas extract did not increase the rate of glucose removal from the hemolymph.