Recherches endocrinologiques en culture organotypique chez les annélides polychètes

M, Durchon; Schaller, Francois

doi:10.1016/0016-6480(64)90010-3

Cited by 11 publications

(2 citation statements)

References 2 publications

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“…Numerous studies have shown that gamete maturation is inhibited by a hormone presumably secreted by the brain, and this inhibition has been described in males (Durchon and Schaller, 1964;Malecha, 1967) and females (Clark and Ruston, 1963;Durchon and Boilly, 1964;Hauenschild, 1966;Dhainaut and Porchet, 1967) among several species of oviparous nereids. It is not surprising, therefore, that hormonal inhibition of both sperm and oocyte maturation occurs simultaneously in N. limnicola, a self-fertilizing hermaphrodite in which the eggs and sperm develop simultaneously within the coelom of an individual.…”

Section: Discussionmentioning

confidence: 99%

EXPERIMENTAL STUDIES ON THE ENDOCRINOLOGY AND REPRODUCTIVE BIOLOGY OF THE VIVIPAROUS POLYCHAETE ANNELID,NEREIS LIMNICOLAJOHNSON

Baskin¹,

Golding²

1970

The Biological Bulletin

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Section: Discussionmentioning

confidence: 99%

EXPERIMENTAL STUDIES ON THE ENDOCRINOLOGY AND REPRODUCTIVE BIOLOGY OF THE VIVIPAROUS POLYCHAETE ANNELID,NEREIS LIMNICOLAJOHNSON

Baskin¹,

Golding²

1970

The Biological Bulletin

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“…Transplantation of oocytes, lysates from the maturing gametes, or injection of coelomic contents were shown to exert negative feedback on the activity of the brain hormone (Andries, 2001;Durchon, 1952;Hofmann, 1975;Porchet, 1967;Porchet and Cardon, 1976;Porchet and Durchon, 1968). In Nereis diversicolor, worms with oocytes larger than 140 µm show diminished posterior regeneration and worms with oocytes exceeding 180 µm can not regenerate at all (Golding, 1967b).…”

Section: Hormonal Control Of Growth and Regenerationmentioning

confidence: 99%

The cost and payout of age on germline regeneration and sexual maturation inPlatynereis dumerilii

Metzger,

Özpolat

2024

Preprint

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Regeneration, regrowing lost and injured body parts, is an ability that generally declines with age or developmental transitions (i.e. metamorphosis, sexual maturation) in many organisms. Regeneration is also energetically a costly process, and trade-offs occur between regeneration and other costly processes such as somatic growth, or sexual reproduction. Here we investigate the interplay of regeneration, reproduction, and age in the segmented wormPlatynereis dumerilii.P. dumeriliican regenerate its whole posterior body axis, along with its reproductive cells, thereby having to carry out the two costly processes (somatic and germ cell regeneration) after injury. We specifically examine how age affects the success of germ cell regeneration and sexual maturation in developmentally young versus old organisms. We hypothesized that developmentally younger individuals (i.e. lower investment state, with gametes in early mitotic stages) will have higher regeneration success and reach sexual maturation faster than the individuals at developmentally older stages (i.e. higher investment state, with gametes in the process of maturation). Surprisingly, older amputated worms grew faster and matured earlier than younger amputees, even though they had to regenerate more segments and recuperate the more costly germ cells which were already starting to undergo gametogenesis. To analyze germ cell regeneration across stages, we used Hybridization Chain Reaction for the germline markervasa. We found that regenerated worms start repopulating new segments with germ cell clusters as early as 14 days post amputation. In addition,vasaexpression is observed in a wide region of newly-regenerated segments, which appears different from expression patterns during normal growth or regeneration in worms before gonial cluster expansion. Future studies will focus on determining the exact sources of gonial clusters in regeneration.FundingNIGMS 1R35GM138008-01, Hibbitt Fellowship, WashU Startup funds

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Seasonal changes of the neurosecretory cells of Harmothoe imbricata Kinberg 1857

Korn

1969

Z. Zellforsch.

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Recherches endocrinologiques en culture organotypique chez les annélides polychètes

Cited by 11 publications

References 2 publications

EXPERIMENTAL STUDIES ON THE ENDOCRINOLOGY AND REPRODUCTIVE BIOLOGY OF THE VIVIPAROUS POLYCHAETE ANNELID,NEREIS LIMNICOLAJOHNSON

EXPERIMENTAL STUDIES ON THE ENDOCRINOLOGY AND REPRODUCTIVE BIOLOGY OF THE VIVIPAROUS POLYCHAETE ANNELID,NEREIS LIMNICOLAJOHNSON

The cost and payout of age on germline regeneration and sexual maturation inPlatynereis dumerilii

Seasonal changes of the neurosecretory cells of Harmothoe imbricata Kinberg 1857

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