Rôle of neurosecretory cells of pars intercerebralis in regulating RNA synthesis in some tissues of Acheta domesticus

Abstract

Studies were made of RNA synthesis in the neurosecretory cells of the suboesophageal ganglion, the follicular epithelial cells of oöcytes, and the cells of the fat body during the daily cycle in female house crickets kept under conditions of alternating light and darkness. Circadian variations in intensity of RNA synthesis were found, which were particularly distinctive in the neurosecretory cells of the ganglion and the follicular epithelial cells. Destruction of the neurosecretory cells of the pars intercerebralis affects the intensity of RNA synthesis in the tissues examined. The response to the operation performed is, however, different and depends on the tissue. Whereas total abolition of RNA synthesis is observed in the neurosecretory cells of the suboesophageal ganglion, after cauterization of the neurosecretory cells of the pars intercerebralis this process continues and would even appear to be intensified in the cells of both the follicular epithelium and of the fat body. The probable causes of the different responses of different tissues to destruction of the neurosecretory cells of the brain are discussed.