Photoperiod‐independent testicular development in the model newt Pleurodeles waltl

2021 ◽  
Author(s):  
Mitsuki Kyakuno ◽  
Rei Nakamori ◽  
Ichiro Tazawa ◽  
Hitoshi Uemasu ◽  
Noriyuki Namba ◽  
...  
Keyword(s):  
Testicular Development ◽  
Pleurodeles Waltl

Reduction of spermatogonia and testosterone in rat testes flown on space lab-3

1986 ◽  
Vol 44 ◽  
pp. 248-249
Author(s):  
Delbert E. Philpott ◽  
W. Sapp ◽  
C. Williams ◽  
T. Fast ◽  
J. Stevenson ◽  
...  
Keyword(s):  
Social Interaction ◽  
Social Status ◽  
Population Size ◽  
Physiological Response ◽  
Social Rank ◽  
Reproductive Function ◽  
Testicular Development ◽  
Organ Weights ◽  
Reproductive Maturation ◽  
Metabolic Activities

Space Lab 3 (SL-3) was flown on Shuttle Challenger providing an opportunity to measure the effect of spaceflight on rat testes. Cannon developed the idea that organisms react to unfavorable conditions with highly integrated metabolic activities. Selye summarized the manifestations of physiological response to nonspecific stress and he pointed out that atrophy of the gonads always occurred. Many papers have been published showing the effects of social interaction, crowding, peck order and confinement. Flickinger showed delayed testicular development in subordinate roosters influenced by group numbers, social rank and social status. Christian reported increasing population size in mice resulted in adrenal hypertrophy, inhibition of reproductive maturation and loss of reproductive function in adults. Sex organ weights also declined. Two male dogs were flown on Cosmos 110 for 22 days. Fedorova reported an increase of 30 to 70% atypical spermatozoa consisting of tail curling and/or the absence of a tail.

Postnatal growth rate and gonadal development in circadian tau mutant hamsters reared in constant dim red light

Reproduction ◽  
2000 ◽  
pp. 327-330 ◽  
Author(s):  
RJ Lucas ◽  
JA Stirland ◽  
YN Mohammad ◽  
AS Loudon
Keyword(s):  
Time Course ◽  
Red Light ◽  
Somatic Growth ◽  
Postnatal Growth ◽  
Gonadal Development ◽  
Testicular Development ◽  
Wild Type ◽  
Similar Time ◽  
Syrian Hamsters ◽  
Body Weights

The role of the circadian clock in the reproductive development of Syrian hamsters (Mesocricetus auratus was examined in wild type and circadian tau mutant hamsters reared from birth to 26 weeks of age under constant dim red light. Testis diameter and body weights were determined at weekly intervals in male hamsters from 4 weeks of age. In both genotypes, testicular development, subsequent regression and recrudescence exhibited a similar time course. The age at which animals displayed reproductive photosensitivity, as exhibited by testicular regression, was unrelated to circadian genotype (mean +/- SEM: 54 +/- 3 days for wild type and 59 +/- 5 days for tau mutants). In contrast, our studies revealed a significant impact of the mutation on somatic growth, such that tau mutants weighed 18% less than wild types at the end of the experiment. Our study reveals that the juvenile onset of reproductive photoperiodism in Syrian hamsters is not timed by the circadian system.

scholarly journals Characterization of the G protein-coupled receptor family SREB across fish evolution

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Timothy S. Breton ◽  
William G. B. Sampson ◽  
Benjamin Clifford ◽  
Anyssa M. Phaneuf ◽  
Ilze Smidt ◽  
...  
Keyword(s):  
G Protein ◽  
Genomic Structure ◽  
Integrated Approach ◽  
Orphan Receptor ◽  
Specific Gene ◽  
Testicular Development ◽  
Brain Expression ◽  
And Function ◽  
G Protein Coupled ◽  
Receptor Family

AbstractThe SREB (Super-conserved Receptors Expressed in Brain) family of G protein-coupled receptors is highly conserved across vertebrates and consists of three members: SREB1 (orphan receptor GPR27), SREB2 (GPR85), and SREB3 (GPR173). Ligands for these receptors are largely unknown or only recently identified, and functions for all three are still beginning to be understood, including roles in glucose homeostasis, neurogenesis, and hypothalamic control of reproduction. In addition to the brain, all three are expressed in gonads, but relatively few studies have focused on this, especially in non-mammalian models or in an integrated approach across the entire receptor family. The purpose of this study was to more fully characterize sreb genes in fish, using comparative genomics and gonadal expression analyses in five diverse ray-finned (Actinopterygii) species across evolution. Several unique characteristics were identified in fish, including: (1) a novel, fourth euteleost-specific gene (sreb3b or gpr173b) that likely emerged from a copy of sreb3 in a separate event after the teleost whole genome duplication, (2) sreb3a gene loss in Order Cyprinodontiformes, and (3) expression differences between a gar species and teleosts. Overall, gonadal patterns suggested an important role for all sreb genes in teleost testicular development, while gar were characterized by greater ovarian expression that may reflect similar roles to mammals. The novel sreb3b gene was also characterized by several unique features, including divergent but highly conserved amino acid positions, and elevated brain expression in puffer (Dichotomyctere nigroviridis) that more closely matched sreb2, not sreb3a. These results demonstrate that SREBs may differ among vertebrates in genomic structure and function, and more research is needed to better understand these roles in fish.

Microcystin-LR disturbs testicular development of giant freshwater prawn Macrobrachium rosenbergii

Chemosphere ◽  
2019 ◽  
Vol 222 ◽  
pp. 584-592 ◽  
Author(s):  
Yingying Zhang ◽  
Hang Zhuang ◽  
Hui Yang ◽  
Wen Xue ◽  
Liufu Wang ◽  
...  
Keyword(s):  
Macrobrachium Rosenbergii ◽  
Freshwater Prawn ◽  
Testicular Development ◽  
Giant Freshwater Prawn

Aromatase and 11β-hydroxysteroid dehydrogenase 2 localisation in the testes of pigs from birth to puberty linked to changes of hormone pattern and testicular morphology

2008 ◽  
Vol 20 (4) ◽  
pp. 505 ◽  
Author(s):  
A. Wagner ◽  
R. Claus
Keyword(s):  
Blood Plasma ◽  
Sertoli Cell ◽  
Germ Cells ◽  
Leydig Cells ◽  
Hydroxysteroid Dehydrogenase ◽  
Blood Collection ◽  
Testicular Development ◽  
Post Mortem ◽  
Cell Numbers ◽  
Testicular Morphology

Oestrogens and glucocorticoids are important for spermatogenesis and are regulated via aromatase for oestradiol synthesis and 11β-hydroxysteroid dehydrogenase 2 (11β-HSD 2) as an inactivator of cortisol. In the present study postnatal changes of these two enzymes were monitored together with testicular development and hormone concentrations. Pigs were assigned to three periods: Weeks 0–5, Weeks 5–11 or Weeks 11–17. In Period 1, groups of four piglets were killed after each week. Blood plasma and testes were sampled immediately post mortem. For Periods 2 and 3, groups of six pigs were fitted with vein catheters for daily blood collection. Testes from all pigs were obtained after killing. Levels of testosterone, oestradiol, LH, FSH and cortisol were determined radioimmunologically. The 11β-HSD 2- and aromatase-expressing cells were stained immunocytochemically. All hormones were maximal 2 weeks after birth. A rise of LH, testosterone and oestradiol occurred again at Week 17. FSH and cortisol remained basal. Parallel to the first postnatal rise, the presence of aromatase and 11β-HSD 2 in Leydig cells increased, together with germ and Sertoli cell numbers. Expression was low from 3 to 5 weeks, was resumed after Week 5 and was maximal at Week 17. The amount of 11β-HSD 2 in germ cells was greatest at birth, decreased thereafter and was absent after Week 3.

Testicular development and spermatogenesis in fish: insights into molecular aspects and regulation of gene expression by different exogenous factors

2021 ◽  
Author(s):  
Irfan A. Bhat ◽  
Jaffer Y. Dar ◽  
Irshad Ahmad ◽  
Ishfaq N. Mir ◽  
Hussna Bhat ◽  
...  
Keyword(s):  
Gene Expression ◽  
Regulation Of Gene Expression ◽  
Testicular Development ◽  
Exogenous Factors ◽  
Molecular Aspects

Effects of Day Length, Temperature, and Green Food on Testicular Development in a Desert Pocket Mouse Perognathus formosus

1981 ◽  
Vol 54 (1) ◽  
pp. 62-73 ◽  
Author(s):  
G. J. Kenagy ◽  
George A. Bartholomew
Keyword(s):  
Day Length ◽  
Testicular Development ◽  
Green Food ◽  
Pocket Mouse

scholarly journals TCF21+ mesenchymal cells contribute to testis somatic cell development, homeostasis, and regeneration in mice

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yu-chi Shen ◽  
Adrienne Niederriter Shami ◽  
Lindsay Moritz ◽  
Hailey Larose ◽  
Gabriel L. Manske ◽  
...  
Keyword(s):  
Tissue Homeostasis ◽  
Testicular Development ◽  
Myoid Cells ◽  
Regenerative Capacity ◽  
Adult Testis ◽  
Mesenchymal Progenitors ◽  
And Function ◽  
Potential Reserve ◽  
Resident Fibroblast

AbstractTesticular development and function rely on interactions between somatic cells and the germline, but similar to other organs, regenerative capacity declines in aging and disease. Whether the adult testis maintains a reserve progenitor population remains uncertain. Here, we characterize a recently identified mouse testis interstitial population expressing the transcription factor Tcf21. We found that TCF21lin cells are bipotential somatic progenitors present in fetal testis and ovary, maintain adult testis homeostasis during aging, and act as potential reserve somatic progenitors following injury. In vitro, TCF21lin cells are multipotent mesenchymal progenitors which form multiple somatic lineages including Leydig and myoid cells. Additionally, TCF21+ cells resemble resident fibroblast populations reported in other organs having roles in tissue homeostasis, fibrosis, and regeneration. Our findings reveal that the testis, like other organs, maintains multipotent mesenchymal progenitors that can be potentially leveraged in development of future therapies for hypoandrogenism and/or infertility.

Possible envenomation by a sting by Pleurodeles waltl (Iberian Ribbed Newt) resulting in mild symptoms

2021 ◽  
pp. 1-2
Author(s):  
Joan Fuchs ◽  
Lubos Hvozdara ◽  
Stefan Weiler
Keyword(s):  
Pleurodeles Waltl

Finely tuned ciliary alignment and coordinated beating generate continuous water flow across the external gills in Pleurodeles waltl larvae

Zoomorphology ◽  
2020 ◽  
Vol 139 (2) ◽  
pp. 247-262
Author(s):  
Reico Ichikawa ◽  
Ryuji Toyoizumi
Keyword(s):  
Water Flow ◽  
Pleurodeles Waltl
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