In vivo recordings of neuroendocrine cells (caudo-dorsal cells) in the pond snail

Maat, A. Ter; Dijcks, Fred A.; Bos, N. P. A.

doi:10.1007/bf01324826

Cited by 45 publications

(10 citation statements)

References 14 publications

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“…Th ese cells project into the neurohaemal area of the cerebral commissure, are electrically coupled, and send axons through the cerebral commissure to the contralateral cell cluster (Joosse, 1964 ;Wendelaar-Bonga, 1971 ;Roubos, 1976 ;De Vlieger et al, 1980 ). As a consequence, these cells show a synchronous, long-lasting discharge (De Vlieger et al, 1980 ;Ter Maat et al, 1986 ). Th at these CDCs are neurosecretory and that their products induce egg laying was fi rst shown by injecting extracts from the cerebral commissure into the blood (e.g.…”

Section: How Is the Egg Laying Process Aff Ected In The Recipient?mentioning

confidence: 96%

Reduced egg laying caused by a male accessory gland product opens the possibility for sexual conflict in a simultaneous hermaphrodite

2009

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Promiscuity, sperm storage and internal fertilization enhance sperm competition, which leads to sexual confl ict whenever an advantageous trait for sperm donors is harmful to recipients. In separate-sex species, such confl icts can severely impact the evolution of reproductive characteristics, physiology and behaviours. For simultaneous hermaphrodites, the generality of this impact remains unclear and underlying mechanisms remain largely unexplored. In the hermaphrodite Lymnaea stagnalis several previous studies showed that investment in eggs diff ers depending on semen receipt, but these were inconsistent about the direction of change. We investigated whether the change in egg laying is caused by a seminal fl uid component. By intravaginally injecting animals, we here reveal that a component of the seminal fl uid inhibits egg laying, thus providing the fi rst direct evidence for involvement of such components in competition for fertilization in hermaphrodites. We discuss the broad implications that this fi nding has on a number of previous studies performed in the same species. © Koninklijke Brill NV, Leiden, 2009.

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Section: How Is the Egg Laying Process Aff Ected In The Recipient?mentioning

confidence: 96%

Reduced egg laying caused by a male accessory gland product opens the possibility for sexual conflict in a simultaneous hermaphrodite

2009

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“…Egg laying is usually completely separated from insemination since most species can store allosperm and can self fertilize (e.g., L. stagnalis : Cain, 1956 ; B. glabrata : Vianey-Liaud et al, 1989 , 1996 ). Egg laying itself seems to be influenced both by mating activity and environmental factors ( L. stagnalis : Ter Maat et al, 1986 ; Koene et al, 2006 ; B. glabrata : Boyle and Yoshino, 2000 ) and is composed of a typical sequence of phases, starting with resting, followed by turning and oviposition, and ending with inspection of the egg mass (see Ter Maat et al, 1989 and below).…”

Section: Introductionmentioning

confidence: 99%

Neuro-endocrine control of reproduction in hermaphroditic freshwater snails: mechanisms and evolution

Koene

2010

Front. Behav. Neurosci.

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Invertebrates are used extensively as model species to investigate neuro-endocrine processes regulating behaviors, and many of these processes may be extrapolated to vertebrates. However, when it comes to reproductive processes, many of these model species differ notably in their mode of reproduction. A point in case are simultaneously hermaphroditic molluscs. In this review I aim to achieve two things. On the one hand, I provide a comprehensive overview of the neuro-endocrine control of male and female reproductive processes in freshwater snails. Even though the focus will necessarily be on Lymnaea stagnalis, since this is the best-studied species in this respect, extensions to other species are made wherever possible. On the other hand, I will place these findings in the actual context of the whole animal, after all these are simultaneous hermaphrodites. By considering the hermaphroditic situation, I uncover a numbers of possible links between the regulation of the two reproductive systems that are present within this animal, and suggest a few possible mechanisms via which this animal can effectively switch between the two sexual roles in the flexible way that it does. Evidently, this opens up a number of new research questions and areas that explicitly integrate knowledge about behavioral decisions (e.g., mating, insemination, egg laying) and sexual selection processes (e.g., mate choice, sperm allocation) with the actual underlying neuronal and endocrine mechanisms required for these processes to act and function effectively.

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“…The peptidergic caudal dorsal cells (CDCs) in the freshwater snail Lymnaea stagnalis regulate egg laying by the release of a number of peptides during a stereotyped firing pattern (CDC discharge) that lasts for 60 min and precedes ovulation (Kits, 1980;Ebberink, Price, Van Loenhout, Doble, Riehm, Geraerts & Greenberg, 1985;Ter Maat, Dijks & Bos, 1986). FMRFa is a putative neurotransmitter on the CDCs (Brussaard, Kits, Ter Maat, Van Minnen & Moed, 1988).…”

Section: Introductionmentioning

confidence: 99%

Inhibitory modulation by FMRFamide of the voltage‐gated sodium current in identified neurones in Lymnaea stagnalis.

Brussaard

Lodder

Maat

et al. 1991

The Journal of Physiology

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SUMMARY1. The putative neurotransmitter FMRFa (Phe-Met-Arg-Phe-amide) caused an inhibitory modulation of the voltage-gated sodium current (INa) in central neurones, the peptidergic caudo dorsal cells (CDCs) of the mollusc Lymnaea stagnal7is. FMRFa reduced INa at all command potentials tested (ranging from -35 to + 20 mV), but the amplitude of the effect of FMRFa was voltage dependent, inhibition being stronger at more negative potentials (50 + 5 % reduction at half-maximal INa activation versus 25 + 8 % at the peak of the I-V curve).2. INa current traces were well fitted by a Hodgkin & Huxley based model, using m3 activation kinetics and two time constants for inactivation.3. The steady-state inactivation curve of INa was characterized by half-maximal inactivation at -42-5 + 1-81 mV and a slope factor of 4-6 + 0-28 mV. The fastest time constant of inactivation ran from 100 + 5 to 0-8 + 0-32 ms and the slower time constant from 505 +45 to 4-8 + 1-40 ms in the range -40 to -5 mV.4. FMRFa had no significant effect on either component of inactivation, nor on the voltage dependence of steady-state inactivation, nor on the maximal conductance.5. FMRFa affected the activation of INa. The activation time constant was increased, ranging from 0-75 + 0-050 to 0-22 + 0-017 ms under control and from 0-91 + 0 043 to 0-31 + 0-038 ms with FMRFa in the voltage range -25 to + 5 mV. The steady-state activation curve was shifted to less negative potentials: half-maximal activation occurred at -26-5 + 1-2 mV under control and at 23-6 + 1-4 mV with FMRFa; the slope factor (4-6 + 1-4 mV in control experiments) was not affected. The combination of slower activation kinetics and a shift in the voltage dependence of activation in the Hodgkin & Huxley based model, adequately explained the reduction of INa by FMRFa.

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In vivo recordings of neuroendocrine cells (caudo-dorsal cells) in the pond snail

Cited by 45 publications

References 14 publications

Reduced egg laying caused by a male accessory gland product opens the possibility for sexual conflict in a simultaneous hermaphrodite

Reduced egg laying caused by a male accessory gland product opens the possibility for sexual conflict in a simultaneous hermaphrodite

Neuro-endocrine control of reproduction in hermaphroditic freshwater snails: mechanisms and evolution

Inhibitory modulation by FMRFamide of the voltage‐gated sodium current in identified neurones in Lymnaea stagnalis.

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