PROTEIN PATTERNS IN DIFFERENT LOBES AND DURING DEVELOPMENT OF OCTOPUS BRAIN

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Abstract
Abstract— Utilizing techniques of continuous and SDS‐electrophoresis we have examined the saline‐soluble and SDS‐soluble (membrane‐bound) proteins extracted from the main lobes of adult octopus brain and from the developing optic lobe of the same species. Several additional protein bands are present among the soluble and the membrane‐bound proteins of the vertical lobe in comparison with the suboesophageal lobe. Since the former contains an essentially homogeneous population of small neurons, while the suboesophageal lobe is rich in large nerve cells, these protein bands have been attributed to the small neuronal type present in the vertical lobe.In the course of a 10,000‐fold increment in body weight, from 0.4 g to 4 kg, there is a significant increase in the concentration of several soluble proteins extracted from the optic lobe. Three of these proteins increase to a marked degree. Among the membrane‐bound proteins some show a moderate increase with age while other protein components of smaller molecular weight undergo a moderate decrease. The overall tissue concentration of the membrane‐bound proteins increases between 0.4 g and 50 g body weight, slightly declining in animals of larger size.