- Full text PDF available (7)
- This year (0)
- Last 5 years (0)
- Last 10 years (8)
Journals and Conferences
The problem of pre-nervous neurotransmitter systems arose from studies carried out on different groups of invertebrates and vertebrates in the late 1950s to early 1960s. These investigations were motivated by an hypothesis formulated by K. S. Koshtoyants concerning the similarity between pre-nervous control processes and neuronal functions. Here, we review… (More)
Serotonin acts as antagonist of progesterone on amphibian oocytes. Serotonin antagonists inhibit maturation of starfish oocytes and stimulate or trigger maturation in amphibians. We propose that endogenous serotonin participates in the control of oocyte maturation.
1. Classical neurotransmitters (such as acetylcholine, biogenic amines, and GABA) are functionally active througout ontogenesis. 2. Based on accumulated evidence, reviewed herein, we present an hypothetical scheme describing developmental changes in this functional activity, from the stage of maturing oocytes through neuronal differentiation. This scheme… (More)
Dopamine, histamine, serotonin, and serotonin analogs were acylated with arachidonic and eicosapentaenoic acids, and the reaction products were named as artificially functionalized fatty acids (AFFA). The amides of arachidonic acid with serotonin, dopamine, and histamine were found to inhibit human platelet aggregation induced by ADP, arachidonic acid and… (More)
Sea urchin embryos and larvae provide an inexpensive high-throughput system for determining developmental actions of neuropharmacologic agents or environmental neurotoxins in both applied and basic biologic contexts. The use of this system for the testing of chlorpyrifos, 1-nicotine, lipophilic amides of choline, and ritanserin is described in detail.
Embryos and larvae of sea urchins (Lytechinus variegatus, Strongylocentrotus droebachiensis, Strongylocentrotus purpuratus, Dendraster excentricus), and starfish (Pisaster ochraceus) were investigated for the presence of a functional endocannabinoid system. Anandamide (arachidonoyl ethanolamide, AEA), was measured in early L. variegatus embryos by liquid… (More)
Three main effects of the amides on embryos of opistobranch molluscs, sea urchins and starfish, were revealed. First, a rather independent and clear protective action of 5-HYDROXYTRYPTAMIDES AND 3-HYDROXYTYRAMIDES against cytostatic antagonists of serotonin and dopamine, resp. Second, prevention of developmental abnormalities induced by protein kinase C… (More)
The ganglioside composition of mouse ascites hepatoma ( MAH ) cells, the ascites fluid and cell-conditioned media were determined and found to be qualitatively identical, but quantitatively different. The ganglioside content of the ascites fluid and the medium conditioned by MAH -cells at the native cell concentration (10(8) cells/ml) comprised respectively… (More)
Evidence is presented in support of the working hypothesis that “prenervous” neurotransmitters directly participate in cell-cell interactions occurring during the first several cleavage divisions of sea urchin embryos, a function which may occur during the early development of higher animals as well. This intercellular signaling could be a link in the… (More)
Chlorpyrifos targets mammalian brain development through a combination of effects directed at cholinergic receptors and intracellular signaling cascades that are involved in cell differentiation. We used sea urchin embryos as an invertebrate model system to explore the cellular mechanisms underlying the actions of chlorpyrifos and to delineate the critical… (More)