Current Topics in Insect Endocrinology and Nutrition: A by Govindan Bhaskaran

By Govindan Bhaskaran

Stanley Friedman college of Illinois Urbana, Illinois A perusal of the desk of contents of this brief symposium on Insect Endocrinology may perhaps lead those who find themselves regularly unin structed in Fraenkel's actions to ask yourself as to our selection of papers. Our justification relies upon our attempt to pay attention the symposium upon a unmarried region within which he has had a longer involvement: particularly, the metamorphic molt in flies. In so doing, we instantly well-known the large humoral and physiological ramifications, either direct and oblique, of such an curiosity. Our choice of those papers is an try and current the large photo with a number of quickly strokes. the 1st providing, by way of J. H. Willis, et al., is an immediate outgrowth of Fraenkel's paintings with Rudall at the chemistry of the puparium. Their investigations at the constitution of fly cuticle and its alterations at pupariation (Fraenkel and Rudall, 1940, Proc. Roy. Soc. London ( ) 129:1; 1947, ibid, 134:111), supplied quanti tative information that have, seeing that that point, stimulated our rules con cerning cuticular alterations at metamorphosis and are almost immediately on the middle of the talk over the mechanism of cuticular hardening and darkening (see Hillerton and Vincent, 1979, l. Ins. Physiol."

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With the more recent appreciation of cuticular protein complexity, it is important to ask whether all or only selected components are modified during this process. In collaboration with Professor Fraenkel, we have extracted larval cuticular proteins from Sarcophaga at different times during larval life and following the onset of puparium formation. Extracts were fractionated on a narrow range (pH 4-6) isoelectric focusing slab gel, which facilitates resolution of these acidic proteins. Since there was a five-fold decline in the amount of protein which could be solubilized as tanning progressed (Fig.

253:1305-1314. Roberts, P. E. and Willis, J. , 1980, The cuticular proteins of Tenebrio molitor. I. Electrophoretic banding patterns during postembryonic development, Develop. Biol. 75:59-69. Ruh, M. F. and Willis, J. , 1974, Synthesis of blood and cuticular proteins in late pharate adults of the Cecropia silkmoth, J. Insect Physiol. 20:1277-1285. Trim, A. , 1941, Studies in the chemistry of the insect cuticle. I. Some general observations on certain arthropod cuticles with special reference to the characterization of the proteins, Biochem.

A reasonable explanation for this and other ultracytological signs of hyperactivity seems to be the constancy of the demand on the corpora allata of these experimental animals, since ovariectomy abolishes the afferent signals in response to which, in the intact animal, the brain turns off juvenile hormone action during the long periods of gestation. The pleomorphism of the mitochondrial population is even more impressive, and glycogen deposits seem to be more numerous than in unoperated "active" controls.

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