Neuronal mechanisms of defense reaction to statocyst receptor stimulation in the freshwater snail Planorbarius corneus

1991 ◽  
Vol 22 (6) ◽  
pp. 587-593
Author(s):  
Yu. I. Arshavskii ◽  
T. G. Delyagina ◽  
I. L. Okshtein ◽  
G. N. Orlovskii ◽  
Yu. V. Panchin
Keyword(s):  
Freshwater Snail ◽  
Defense Reaction ◽  
Receptor Stimulation ◽  
Planorbarius Corneus ◽  
Neuronal Mechanisms

EFFECT OF SEROTONIN AND NEUROPEPTIDES ON ADENYLATE CYCLASE OF THE CENTRAL NERVOUS SYSTEM AND PERIPHERAL ORGANS OF THE FRESHWATER SNAIL PLANORBARIUS CORNEUS

1996 ◽  
Vol 28 (4) ◽  
pp. 417-424 ◽  
Author(s):  
MARIA ENRICA FERRETTI ◽  
DARIO SONETTI ◽  
MARIA CRISTINA PARESCHI ◽  
MARCO BUZZI ◽  
MARIA LUISA COLAMUSSI ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Adenylate Cyclase ◽  
Freshwater Snail ◽  
Planorbarius Corneus ◽  
Peripheral Organs ◽  
The Central Nervous System

scholarly journals The gastropod parasitic nematode Phasmarhabditis hermaphrodita does not affect non-target freshwater snails Lymnaea stagnalis, Bithynia tentaculata and Planorbarius corneus

Nematology ◽  
2015 ◽  
Vol 17 (6) ◽  
pp. 679-683 ◽  
Author(s):  
Gemma Whitaker ◽  
Robbie Rae
Keyword(s):  
Parasitic Nematode ◽  
Lymnaea Stagnalis ◽  
Biological Control Agent ◽  
Freshwater Snail ◽  
Control Agent ◽  
Snail Species ◽  
Planorbarius Corneus ◽  
Bithynia Tentaculata ◽  
In The Wild ◽  
Phasmarhabditis Hermaphrodita

Phasmarhabditis hermaphrodita is a lethal parasite of several slug and snail species that has been formulated into a biological control agent. However, the complete host range of this nematode is poorly understood, in particular its potential to affect non-target aquatic snail species. Here we exposed three species of juvenile and adult freshwater snail (Lymnaea stagnalis, Planorbarius corneus and Bithynia tentaculata) to 30 and 150 P. hermaphrodita cm−2 and assessed survival, as well as differences in weight for 66 days. We show that P. hermaphrodita has no effect on the survival of L. stagnalis, P. corneus and B. tentaculata after 66 days of exposure. In summary, we found little evidence of P. hermaphrodita causing mortality to three freshwater snail species at two different life stages and believe that P. hermaphrodita would have little effect on non-target snail species in the wild.

MDL 12330A inhibits the non-neuronal adenylyl cyclase from the freshwater snail Planorbarius corneus, but the neuronal enzyme is activated by this compound

1996 ◽  
Vol 207 (3) ◽  
pp. 191-194 ◽  
Author(s):  
Maria Enrica Ferretti ◽  
Dario Sonetti ◽  
Maria Cristina Pareschi ◽  
Marco Buzzi ◽  
Maria Luisa Colamussi ◽  
...  
Keyword(s):  
Adenylyl Cyclase ◽  
Freshwater Snail ◽  
Planorbarius Corneus

Neuronal Mechanisms for the Control of Body Orientation inClione II. Modifications in the Activity of Postural Control System

2000 ◽  
Vol 83 (1) ◽  
pp. 367-373 ◽  
Author(s):  
T. G. Deliagina ◽  
G. N. Orlovsky ◽  
A. I. Selverston ◽  
Y. I. Arshavsky
Keyword(s):  
Defense Reaction ◽  
Postural Control System ◽  
Receptor Cells ◽  
Complete Inactivation ◽  
Reflex Pathways ◽  
Neuronal Mechanisms ◽  
Different Types ◽  
Different Temperatures ◽  
Higher Temperature ◽  
Stimulation Of

The marine mollusk Clione limacina, when swimming, can stabilize different body orientations in the gravitational field. The stabilization is based on the reflexes initiated by activation of the statocyst receptor cells and mediated by the cerebro-pedal interneurons that produce excitation of the motoneurons of the effector organs; tail and wings. Here we describe changes in the reflex pathways underlying different modes of postural activity; the maintenance of the head-up orientation at low temperature, the maintenance of the head-down orientation at higher temperature, and a complete inactivation of the postural mechanisms during defense reaction. Experiments were performed on the CNS-statocyst preparation. Spike discharges in the axons of different types of neurons were recorded extracellularly while the preparation was rotated in space through 360° in different planes. We characterized the spatial zones of activity of the tail and wing motoneurons and the CPB3 interneurons mediating the effects of statocyst receptor cells on the tail motoneurons. This was done at different temperatures (10 and 20°C). The “fictive” defense reaction was evoked by electrical stimulation of the head nerve. At 10°C, a tilt of the preparation evoked activation in the tail motoneurons and wing retractor motoneurons contralateral to the tilt and in the wing locomotor motoneurons ipsilateral to the tilt. At 20°C, the responses in the tail motoneurons and in the wing retractor motoneurons occurred reversed; these neurons were now activated with the ipsilateral tilt. In the wing locomotor motoneurons the responses at 20°C were suppressed. During the defense reaction, gravitational responses in all neuron types were suppressed. Changes in the chains of tail reflexes most likely occurred at the level of connections from the statocyst receptor cells to the CPB3 interneurons. The changes in gravitational reflexes revealed in the present study are sufficient to explain the corresponding modifications of the postural behavior in Clione.

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