Stimulation of spermatogonial DNA synthesis in slug gonad by a factor released from cerebral ganglia under the influence of long days

Sokolove, Phillip G.; Melrose, Glenn R.; Gordon, Terry M.; O'Neill, Michael C.

doi:10.1016/0016-6480(83)90246-0

Cited by 16 publications

(7 citation statements)

References 14 publications

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“…L'analyse expérimentale de l'action des facteurs externes sur la gamétogenèse et la reproduction des Gastéropodes n'a été abordée que récemment (Tardy, 1982 (Sokolove et al, 1983). Chez Lymnaea stagnalis, les longues photophases stimulent la production d'oeufs (Bohlken et Joosse, 1982) et accélèrent la maturation sexuelle (Joosse, 1984).…”

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Répercussion de la durée d'éclairement journalier sur l'évolution des cellules nourricières et de la lignée mâle dans l'ovotestis d'Helix aspersa

Gomot¹,

Griffond²

1987

Reprod. Nutr. Dévelop.

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Summary. The effect of lighting duration on the evolution of nurse cells and male line in the Helix aspersa ovotestis.Adult snails (Helix aspersa) were bred under two photoperiods i.e. long-day : 18 h (JL), short-day : 8 h (JC) immediately after a 4 month hibernation. In these conditions only the long-day snails began to lay eggs from the 10th week of experiment, whereas the others did not.To explain these differences, the structure and functioning of the hermaphroditic glands were investigated in both groups, 6 and 10 weeks later, using electron microscopic and quantitative biochemical methods.At 6 weeks, compared to short-day cycles (JC1, long-days (JL) highly increased spermatogonial multiplication measured by 3 H thymidine incorporation and on the other hand shortened the duration of spermatogenesis. Ultrastructural observations showed that modifications of the nurse cells were strongly correlated with the evolution of the male line.At 10 weeks, the rates of spermatogonial multiplication were rather similar in all snails.In spite of the absence of anomalies in the male cells, no reproduction occurred among the short-day animals ; this is probably due to a low concentration of sperm, suggesting an insufficient stimulation by the neuroendocrine controlling centers.Introduction.

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Répercussion de la durée d'éclairement journalier sur l'évolution des cellules nourricières et de la lignée mâle dans l'ovotestis d'Helix aspersa

Gomot¹,

Griffond²

1987

Reprod. Nutr. Dévelop.

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“…Helix aspersa, Stylommatophora [1]) and with spermatogonial proliferation in maturing young snails (Lymnaea stagnalis, Basommatophora [2]; Helix aspersa [3]; Limax maximus, Stylommatophora [4] 16 March 2015 150 been postulated that these processes are under the control of one or more male brain factors [5]. Furthermore, the long-term effects of low temperature and starvation have been studied in L. stagnalis.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of frequencies and proportions of cytologically classified spermatogenic cells in the hermaphroditic snailLymnaea stagnalis.1. A study of diurnal variations

Jong-Brink

Jager

Bolwerk

et al. 1985

International Journal of Invertebrate Reproduction and Developm

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Diurnal vanattons in spermatogenesis in the hermaphroditic snail Lymnaea stagnalis were studied by counting Sertoli cells classified according to their developmental stage (I-IV). The levels of the frequencies of these stages were studied in a field population of non-copulating snails during a 24 h period. The results were extensively analysed with statistical methods.Non-copulating snails sampled at the same time during a 24 h period appeared to be homogeneous with respect to the frequency distributions of Sertoli cells over the distinguished stages, except for the snails sampled at 5.00 a.m. This inhomogeneity coincided with lowest values or changes of environmental factors measured. The relative frequencies of stage III ('ripe' spermatids) showed a significant fluctuating pattern, whereas those of stage IV (spermiation) remained at a very constant level.

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“…Chez les Limaces, la cauttrisation des corps dorsaux a &t effectuk chez Agriolimax (Wijdenes et al, 1976) et l'influence d'extraits de cerveau a Ct C observk chez Arion subficus, in virro (Wattez. 1978) et in vivo (Wattez, 1982): Chez Limax maximus, le dtveloppement de l'appareil reproducteur est sous la dtpendance de la photofiriode (Sokolove et al, 1978) et des exp6riences de transplantation montrent que le cerveau des Limaces expo& h des jours longs skrbte un facteur qui induit une forte mitogenbe des cellules miles (Sokolove et al, 1983).…”

Section: Introductionunclassified

Etude exploratoire de la spermatogenèse induite par la chaleur chez l'escargotHelix aspersaen hibernation: Rôle du cerveau / An exploratory study on temperature-induced spermatogenesis in the hibernating snailHelix aspersa:the role of the brain

Gomot

1989

Invertebrate Reproduction & Development

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An exploratory study on temperature-induced spermatogenesis in the hibernating snail Helix aspersa: the role of the brah.The male cells in the ovotestis of hibernating snails undergo multiplication when the temperature of the environment is raised from 5°C to 25°C. If the temperature is maintained at 25°C for 4 weeks the process of spermatogenesis is completed but the rate of spermatogenesis (DNA synthesis) starts decreasing from the 3rd week (Table 1; Fig. 1).Brain ablation in hibernating snails maintained at 25°C causes a significant increase in DNA synthesis exclusively in male cells of the ovotestis. This suggests that the brain exerts an inhibitory influence on spermatogenic multiplication. This influence is effective only during the first and the fourth week of exposure of hibernating snails to 25°C ( Fig. 1; Table 1) indicating the existence of an endogenous cyclical control. Spermiogenesis is, however, not affected by brain extirpation (Fig. 4 A,B,C).When reimplanted in the head haemocoel the brain appears normal histologically (Fig. 5 A,B) and it reestablishes the inhibitory influence on DNA synthesis in the ovotestis only during the first day of temperature-induction. During the 1st. 3rd and 4th week the reimplanted brain, deprived of its neural connections, fails to exert its inhibitory influence suggesting that for this influence to function neural connections to the brain are essential. Surprisingly. the implanted brain seems to inhibit DNA synthesis during the 2nd week of temperature-induction (Table 1). These experiments show that the brain control temperature-induced spermatogenic multiplication in the ovotestis in snails at the onset of hibernation and this control is exerted by one or more inhibitory factors originating from the brain which may function in concert or independently to produce the neuroendocrine effect. It seems therefore justified to consider spermatogenesis in hibernating snails as being neuroendocrinologically controlled.

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Stimulation of spermatogonial DNA synthesis in slug gonad by a factor released from cerebral ganglia under the influence of long days

Cited by 16 publications

References 14 publications

Répercussion de la durée d'éclairement journalier sur l'évolution des cellules nourricières et de la lignée mâle dans l'ovotestis d'Helix aspersa

Répercussion de la durée d'éclairement journalier sur l'évolution des cellules nourricières et de la lignée mâle dans l'ovotestis d'Helix aspersa

Statistical analysis of frequencies and proportions of cytologically classified spermatogenic cells in the hermaphroditic snailLymnaea stagnalis.1. A study of diurnal variations

Etude exploratoire de la spermatogenèse induite par la chaleur chez l'escargotHelix aspersaen hibernation: Rôle du cerveau / An exploratory study on temperature-induced spermatogenesis in the hibernating snailHelix aspersa:the role of the brain

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