Role of bag cells in egg deposition ofAplysia brasiliana

Cobbs, J. S.; Pinsker, H. M.

doi:10.1007/bf00612018

Cited by 36 publications

(2 citation statements)

References 23 publications

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“…These cells synthesize and release a family of peptides that are involved in the regulation of egg-laying behavior (Arch et al 1976;Scheller et al 1983;Sigvardt et al 1986;). One of these peptides, the 36-amino acid egg-laying hormone (ELH; Chiu et al 1979), has prolonged excitatory effects on identified neurons in the abdominal and other ganglia , causes expulsion of ripe oocytes from the gonad (Coggeshall 1970;Rothman et al 1983), and probably has targets in other reproductive tissues and the heart (Blankenship et al 1982;Cobbs and Pinsker 1982;Smock et al 1978).…”

Section: Introductionmentioning

confidence: 99%

Isolation of an egg-laying hormone-binding protein from the gonad of Aplysia californica and its localization in oocytes

et al. 1993

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A protein solubilized from a membrane preparation of the gonad of Aplysia californica has been isolated by affinity chromatography, using bag cell egg-laying hormone (ELH) as the bound ligand, and partially purified and characterized by gel electrophoresis. The protein has an apparent molecular weight of 52 kDa and consists of two disulfide-linked subunits of about 30 kDa each. The protein is glycosylated and has an acidic pI. Approximately 10-15 micrograms of this protein can be isolated from a single ovotestis, representing less than 1% of the total protein in the gonad; but the protein could not be detected in buccal mass or body wall, tissues which do not have apparent response to ELH. Antibodies generated against this ELH-binding protein (ELHBP) were used to localize sites in the ovotestis which might contain this molecule and thus represent targets for egg-laying hormone. Immunocytochemical results indicate that the oocytes are a rich source of this protein, since their cytoplasm was the only detectable site of immunoreactivity. Whether this binding protein represents an egg-laying hormone receptor is uncertain, but its prevalence in oocytes suggests that ELH plays a signaling role on these gametes.

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Section: Introductionmentioning

confidence: 99%

Isolation of an egg-laying hormone-binding protein from the gonad of Aplysia californica and its localization in oocytes

et al. 1993

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“…Behavioral switching occurs when an ongoing behavior is suppressed during the initiation and maintenance of a mutually exclusive behavior. It has been demonstrated in several molluscan species that different and unrelated behavioral acts are organized in an explicit priority sequence, termed behavioral hierarchy (Cobbs and Pinsker 1982;Davis et al 1974a, b;Everett et al 1982;Jahan-Parwar 1980;Ram et al 1988). Such hierarchies may represent the key for the expression of biologically meaningful behavioral responses instead of disorganized movements (Tinbergen 1950).…”

Section: Introductionmentioning

confidence: 99%

Neuronal mechanisms underlying behavioral switching in a pteropod mollusc

Huang

Satterlie

1990

J Comp Physiol A

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In the pteropod mollusc Clione limacina, wing retraction takes precedence over spontaneous and continuous swimming, a phenomenon here defined as behavioral switching. The wing retraction system is organized as a simple reflex in which wing mechanoreceptors activate a pair of retraction interneurons which in turn excite at least two pairs of retraction motoneurons.Activation of individual mechanoreceptors does not inhibit swimming or trigger wing retraction. A pair of retraction interneurons can fully suppress swimming when induced to fire at physiological frequencies, and may be both sufficient and necessary for swim inhibition.Retraction interneurons monosynaptically inhibit both swim interneurons and swim motoneurons. Retraction motoneurons inhibit swim motoneurons through a polysynaptic pathway.A model summarizing the neural circuitry underlying behavioral switching in Clione is presented. A comparison of this model with the behavioral choice model in Pleurobranchaea reveals that the overall neural mechanisms for behavioral choice and behavioral switching are similar as both involve dual function interneurons that not only activate their own motor pathway, but also inhibit the competing motor system. While inhibition is biased toward the afferent side of the competing circuit in behavioral choice, it is biased to the efferent side in behavioral switching.

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Invertebrate Endocrinology

Landau

Biggers

Laufer

1997

Comprehensive Physiology

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The sections in this article are: Growth and Morphogenetic Factors Insects Crustaceans Molluscs Other Invertebrates Regenerative Factors Crustaceans Insects Cnidarians Platyhelminths Annelids Echinoderms Others Pigmentary Factors Crustaceans Insects Osmoregulatory Factors Factors that May Increase Osmotic Pressure Factors that May Decrease Osmotic Pressure Metabolic Factors Biogenic Amines JHs and Farnesylacetone Adipokinetic Hormones and RPCH Crustacean Hyperglycemic Hormones Other Metabolic Factors Reproductive Factors Flatworms, Nemertines, and Nematodes Molluscs Crustaceans Insects Other Arthropods Annelids Echinoderms Behavioral Factors In Vitro Studies In Vivo Studies Pheromones Summary

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Role of bag cells in egg deposition ofAplysia brasiliana

Cited by 36 publications

References 23 publications

Isolation of an egg-laying hormone-binding protein from the gonad of Aplysia californica and its localization in oocytes

Isolation of an egg-laying hormone-binding protein from the gonad of Aplysia californica and its localization in oocytes

Neuronal mechanisms underlying behavioral switching in a pteropod mollusc

Invertebrate Endocrinology

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