Male influence on the ovarian development of the crustacean parasite Bopyrina abbreviata (Isopoda, Bopyridae)

2016 ◽  
Vol 97 (1) ◽  
pp. 91-98 ◽  
Author(s):  
Jesús Romero-Rodríguez ◽  
Ramiro Román-Contreras ◽  
José Luis Bortolini-Rosales
Keyword(s):  
Ovarian Development ◽  
Mature Female ◽  
Ovarian Maturation ◽  
Female Reproduction ◽  
Germinal Layer ◽  
Terrestrial Isopods ◽  
Ovarian Cells ◽  
Terminos Lagoon ◽  
The One ◽  
Ventral Wall

The presence of a male in a population of terrestrial isopods can accelerate the onset of female reproduction, a feature that has been suggested also to occur in bopyrid isopods. This paper aims to estimate the influence of the male presence on the ovarian maturation of Bopyrina abbreviata. Females of B. abbreviata of different sizes were collected at Términos lagoon, Campeche, Mexico. The organisms were morphometrically classified as immature or mature, the male presence or absence at female's marsupium was recorded, and the degree of ovarian development was determined histologically. The internal organization of B. abbreviata agrees with that described for bopyrids and isopods in general. The ovarian cells originate from a dorsal lamina germinal layer that extends horizontally. The ovarian development of lone and paired immature females was classified as incipient and medium, respectively. In mature females it was classified as advanced, in the paired females and in the one lone mature female studied. The lone mature female differed from paired mature females only in the presence of reabsorption process in some oocytes located closer to the ventral wall of the ovary. Morphology variations between lone and paired females suggests that the presence of a cryptoniscus larva or a male between the female's pleopods stimulates the onset of reproduction and accelerates the ovarian development of B. abbreviata.

Dynamics of fatty acid regulatory genes during ovarian development in Penaeus monodon

Reproduction ◽  
2018 ◽  
Author(s):  
Pacharawan Deenarn ◽  
Punsa Tobwor ◽  
Rungnapa Leelatanawit ◽  
Somjai Wongtriphop ◽  
Jutatip Khudet ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Ovarian Development ◽  
Penaeus Monodon ◽  
Chain Fatty Acid ◽  
Regulatory Genes ◽  
Ovarian Maturation ◽  
Long Chain Fatty Acid ◽  
Eyestalk Ablation ◽  
Regulatory Pathways ◽  
Expression Levels

The delay in ovarian maturation in farmed black tiger shrimp Penaeus monodon has resulted in the widespread practice of feeding broodstock with the polychaetes Perinereis nuntia and their unilateral eyestalk ablation. Although this practice alters fatty acid content in shrimp ovaries and hepatopancreas, its effects on fatty acid regulatory genes have yet to be systematically examined. Here, microarray analysis was performed on hepatopancreas and ovary cDNA collected from P. monodon at different ovarian maturation stages, revealing that 72 and 58 genes in fatty acid regulatory pathways were differentially expressed in hepatopancreas and ovaries respectively. Quantitative real-time PCR analysis revealed that ovarian maturation was associated with higher expression levels of acetyl-CoA acetyltransferase, acyl-CoA dehydrogenase, acyl-CoA oxidase 3 and long-chain fatty acid transport protein 4 in hepatopancreas, whereas the expression levels of 15 fatty acid regulatory genes were increased in shrimp ovaries. To distinguish the effects of different treatments, transcriptional changes were examined in P. monodon with stage 1 ovaries before polychaete feeding, after one-month of polychaete feeding and after eyestalk ablation. Polychaete feeding resulted in lower expression levels of enoyl-CoA hydratase and acyl-CoA synthetase medium-chain family member 4, while the expression level of phosphatidylinositide phosphatase SAC1 was higher in shrimp hepatopancreas and ovaries. Additionally, eyestalk ablation resulted in a higher expression level of long-chain fatty acid-CoA ligase 4 in both tissues. Together, our findings describe the dynamics of fatty acid regulatory pathways during crustacean ovarian development and provide potential target genes for alternatives to eyestalk ablation in the future.

scholarly journals p27kip1 (Cyclin-Dependent Kinase Inhibitor 1B) Controls Ovarian Development by Suppressing Follicle Endowment and Activation and Promoting Follicle Atresia in Mice

2007 ◽  
Vol 21 (9) ◽  
pp. 2189-2202 ◽  
Author(s):  
Singareddy Rajareddy ◽  
Pradeep Reddy ◽  
Chun Du ◽  
Lian Liu ◽  
Krishna Jagarlamudi ◽  
...  
Keyword(s):  
Premature Ovarian Failure ◽  
Molecular Mechanisms ◽  
Ovarian Development ◽  
Ovarian Follicle ◽  
Cyclin A ◽  
Ovarian Failure ◽  
Cyclin Dependent Kinase ◽  
Female Reproduction ◽  
Oocyte Growth ◽  
Follicle Atresia

Abstract In humans, the molecular mechanisms underlying ovarian follicle endowment and activation, which are closely related to the control of female reproduction, occurrence of menopause, and related diseases such as premature ovarian failure, are poorly understood. In the current study, we provide several lines of genetic evidence that the cyclin-dependent kinase (Cdk) inhibitor 1B (commonly known as p27kip1 or p27) controls ovarian development in mice by suppressing follicle endowment and activation, and by promoting follicle death. In p27-deficient (p27−/−) mice, postnatal follicle assembly was accelerated, and the number of endowed follicles was doubled as compared with p27+/+ mice. Moreover, in p27−/− ovaries the primordial follicle pool was prematurely activated once it was endowed, and at the same time the massive follicular death that occurs before sexual maturity was rescued by loss of p27. In early adulthood, however, the overactivated follicular pool in p27−/− ovaries was largely depleted, causing premature ovarian failure. Furthermore, we have extensively studied the molecular mechanisms underlying the above-mentioned phenotypes seen in p27−/− ovaries and have found that p27 controls follicular development by several distinct mechanisms at different stages of development of the ovary. For example, p27 controls oocyte growth by suppressing the functions of Cdk2/Cdc2-cyclin A/E1 in oocytes that are arrested at the diplotene stage of meiosis I. This function of p27 is distinct from its well-known role as a suppressor of cell cycle progression. In addition, we have found that p27 activates the caspase-9-caspase-3-caspase-7-poly (ADP-ribose) polymeraseapoptotic cascade by inhibiting Cdk2/Cdc2-cyclin A/B1 kinase activities in follicles, thereby inducing follicle atresia. Our results suggest that the p27 gene is important in determining mammalian ovarian development. This study therefore provides insight into ovary-borne genetic aberrations that cause defects in folliculogenesis and infertility in humans.

Effects of gonadotropin-releasing hormones and dopamine on ovarian maturation in the Pacific white shrimp, Litopenaeus vannamei, and their presence in the ovary during ovarian development

Aquaculture ◽  
2014 ◽  
Vol 420-421 ◽  
pp. 79-88 ◽  
Author(s):  
Yotsawan Tinikul ◽  
Jaruwan Poljaroen ◽  
Ruchanok Tinikul ◽  
Panat Anuracpreeda ◽  
Charoonroj Chotwiwatthanakun ◽  
...  
Keyword(s):  
Litopenaeus Vannamei ◽  
Ovarian Development ◽  
Pacific White Shrimp ◽  
White Shrimp ◽  
Ovarian Maturation ◽  
The Pacific

scholarly journals Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes)

2013 ◽  
Vol 11 (4) ◽  
pp. 821-830 ◽  
Author(s):  
Thiago Scremin Boscolo Pereira ◽  
Renata Guimarães Moreira ◽  
Sergio Ricardo Batlouni
Keyword(s):  
Reproductive Cycle ◽  
Ovarian Development ◽  
Gonadosomatic Index ◽  
Ovarian Maturation ◽  
Invasive Fish ◽  
Multiple Spawning ◽  
Adult Females ◽  
The Mean ◽  
Ovulatory Follicles ◽  
Morphometric Evaluation

In this study, we evaluated the dynamics of ovarian maturation and the spawning processes during the reproductive cycle of Metynnis maculatus. Adult females (n = 36) were collected bimonthly between April 2010 and March 2011. The mean gonadosomatic index (GSI) was determined, ovarian and blood samples were submitted for morphometric evaluation and the steroid plasma concentration was determined by ELISA. This species demonstrated asynchronous ovarian development with multiple spawns. This study revealed that, although defined as a multiple spawning species, the ovaries of M. maculatus have a pattern of development with a predominance of vitellogenesis between April and August and have an intensification in spawning in September; in October, a drop in the mean GSI values occurred, and the highest frequencies of post-ovulatory follicles (POFs) were observed. We observed a positive correlation between the POF and the levels of 17α-hydroxyprogesterone. Metynnis maculatus has the potential to be used as a source of pituitary tissue for the preparation of crude extracts for hormonal induction; the theoretical period for use is from September to December, but specific studies to determine the feasibility of this approach must be conducted.

scholarly journals Estrogen Receptors and Estrogen-Metabolizing Enzymes in Human Ovaries during Fetal Development

2005 ◽  
Vol 90 (6) ◽  
pp. 3752-3756 ◽  
Author(s):  
Tommi E. Vaskivuo ◽  
Minna Mäentausta ◽  
Svea Törn ◽  
Olayiwola Oduwole ◽  
Annika Lönnberg ◽  
...  
Keyword(s):  
Estrogen Receptors ◽  
Granulosa Cells ◽  
Ovarian Development ◽  
Human Life ◽  
Ovarian Follicles ◽  
Fetal Life ◽  
Female Reproduction ◽  
Estrogen Action ◽  
Metabolizing Enzymes ◽  
Human Life Span

Estrogen action plays a crucial role in many processes throughout the human life span, including development. Estrogens are pivotal in the regulation of female reproduction, but little is known about their role during ovarian development. To better understand estrogen action during ovarian development, the expression of estrogen receptors (ERs)-α and -β and key enzymes regulating estradiol production, 17β-hydroxysteroid dehydrogenases (17HSDs) types 1, 2, and 7, were analyzed in human fetal ovaries. The expression of ERs was related to the development of ovarian follicles. Before the 26th week of fetal life ERα was only occasionally detected, but from then onward, its expression was detected in ovarian follicles. Consistent expression of ERβ was seen from the 20th week until term. Both ERα and ERβ were localized to the granulosa cells and oocytes. Expression of 17HSD1 and 17HSD7 enzymes, catalyzing the conversion of estrone to more active estradiol, was detected as early as at the 17th week of fetal life. The expression of 17HSD1 displayed a pattern similar to that of ERs and increased toward term, whereas that of 17HSD7 decreased and was negative by the 36th week. 17HSD1 was localized to the granulosa cells, whereas 17HSD7 expression was more diffuse and was found in both granulosa and stromal cells. 17HSD2, converting estradiol to less potent estrone, was negative in all samples studied. The simultaneous appearance of estrogen-converting enzymes and ERs at the time of follicle formation indicates that the machinery for estrogen action exists in fetal ovaries and suggests a possible role for estrogens in the developing ovary.

scholarly journals Influence of the hypogonadism (hgn) locus on female reproduction and ovarian development in an altered genetic background

2006 ◽  
Vol 5 (3) ◽  
pp. 227-234 ◽  
Author(s):  
HIROETSU SUZUKI ◽  
KUMI DAIGO ◽  
MIKA OKADA ◽  
MIO YAGI ◽  
EIJIRO NAKAMIYA ◽  
...  
Keyword(s):  
Genetic Background ◽  
Ovarian Development ◽  
Female Reproduction

RESISTANCE AGAINST WHITE PINE WEEVIL: EFFECTS ON WEEVIL REPRODUCTION AND HOST FINDING

1998 ◽  
Vol 130 (3) ◽  
pp. 337-347 ◽  
Author(s):  
T.S. Sahota ◽  
J.F. Manville ◽  
F.G. Peet ◽  
E.E. White ◽  
A.I. Ibaraki ◽  
...  
Keyword(s):  
Ovarian Development ◽  
Field Performance ◽  
Tree Breeding ◽  
Host Finding ◽  
Picea Sitchensis ◽  
Ovarian Maturation ◽  
White Pine ◽  
Pissodes Strobi ◽  
Pine Weevils ◽  
White Pine Weevil

AbstractFeeding on leaders of resistant Sitka spruce trees, Picea sitchensis (Bong.) Carr., Led to ovarian regression in white pine weevils, Pissodes strobi Peck., that contained already mature eggs at the time of caging on leaders. Such feeding also led to inhibition or a virtual blockage of ovarian development in weevils that did not contain already mature eggs at the time of caging. Ovarian maturation in such weevils was restored by application of juvenile hormone to female weevils. Effects of three levels of resistance were consistent within the experiments and with the field performance of the tested clones. These results indicate that the effects of resistance were postingestive, i.e., resistance was a form of antibiosis. How antibiosis can cause the weevils to concentrate oviposition on susceptible trees is discussed. Results also provide a means of selecting and ranking resistance of individual spruce trees for tree breeding and reforestation.

scholarly journals Hnrnpk, a Protein Differentially Expressed in Immature Rat Ovarian Development, Is Required for Normal Primordial Follicle Assembly and Development

Endocrinology ◽  
2011 ◽  
Vol 152 (3) ◽  
pp. 1024-1035 ◽  
Author(s):  
Ningling Wang ◽  
Ping Zhang ◽  
Xuejiang Guo ◽  
Zuomin Zhou ◽  
Jiahao Sha
Keyword(s):  
Transcription Factor ◽  
Ovarian Development ◽  
Ovarian Function ◽  
Subsequent Development ◽  
Primordial Follicle ◽  
Differentially Expressed ◽  
Terminal Deoxynucleotidyl Transferase ◽  
Mrna Levels ◽  
Small Interfering Rnas ◽  
Female Reproduction

The formation of ovarian follicles and subsequent development after birth are critical processes for female reproduction, and inappropriate coordination of these processes contributes to ovarian pathologies, such as premature ovarian failure and infertility. Identification and functional investigation of the factors involved in follicular assembly and the initial recruitment will be of great significance to the understanding of the female reproduction process. In this study, we examined the roles of transcription factor heterogeneous nuclear ribonucleoprotein K (Hnrnpk) in rat primordial folliculogenesis using RNA interference knockdown strategies. Reducing Hnrnpk mRNA levels via Hnrnpk small interfering RNAs to neonatal ovaries resulted in a substantial loss of naked oocytes, primordial and primary follicles. Structure disorganization of the ovary characterized by groups of oocytes arranged in nests, clusters of somatic cells not associated with any oocytes and many highly condensed oocyte nuclei was observed. Terminal deoxynucleotidyl transferase deoxyuridine triphosphate nick end labeling assay demonstrated that these abnormalities may be partially attributable to abnormal apoptosis of oocytes. Furthermore, the microarray analysis showed that 63 genes changed significantly (≥2-folds or ≤0.5-fold) between the ovaries treated with Hnrnpk small interfering RNAs and the controls, with 22 up-regulated genes and 41 down-regulated genes. These differentially expressed genes were involved in several critical biological processes in ovarian development. These results suggest that transcription factor Hnrnpk is a key regulator for primordial follicle assembly and development, which provides a new potential therapeutic target to regulate ovarian function and treat ovarian disease.

scholarly journals CONTROL OF FEMALE REPRODUCTION IN DROSOPHILA: GENETIC DISSECTION USING GYNANDROMORPHS

Genetics ◽  
1982 ◽  
Vol 100 (1) ◽  
pp. 61-78 ◽  
Author(s):  
János Szabad ◽  
Csaba Fajszi
Keyword(s):  
Sexual Behavior ◽  
Germ Line ◽  
Genetic Dissection ◽  
Female Reproduction ◽  
Head Region ◽  
Egg Deposition ◽  
Sperm Release ◽  
Rate Characteristic ◽  
The One ◽  
Male Tissue

ABSTRACT The sexual behavior of Drosophila melanogaster gynandromorphs was studied to analyze the relationship between different steps in the female reproductive pathway. It was assumed that, in some gynandromorphs, certain female functions are missing because the corresponding control sites (foci) are either composed of male tissue or did not develop. A given gynandromorph can show elements of both male and female reproductive pathways. None of the steps of the female reproductive pathway appeared to be dependent on any other, in contrast to male behavior where, for example, following of females is a prerequisite for attempted copulation. By correlating each of the behaviors with the genotype of the cuticle, we confirmed previous findings that the focus for the female sex appeal is located in the abdomen, but receptivity to copulation is controlled by a site in the head. Many of the gynandromorphs did not lay eggs, presumably because either the focus controlling egg transfer from the ovaries to the uterus or the one controlling egg deposition was composed of male tissue. Many of the nonovipositing gynandromorphs laid eggs while dying or could be induced to deposit eggs after implantation of hormone-producing glands or topical application of a juvenile hormone analog. Some of the noninseminated gynandromorphs laid eggs at the rate characteristic for inseminated females, suggesting that an oviposition focus (mapping in the head region) suppresses oviposition in virgin females, but not in gynandromorphs whose focus is composed of male tissue. Some of the inseminated gynandromorphs oviposited eggs at a low rate, possibly because the focus responsible for detection of insemination could not function properly. Some of the inseminated gynandromorphs laid unfertilized eggs, revealing the importance of the focus controlling sperm release from the seminal receptacle. Foci controlling egg transfer, egg deposition and sperm release are located in the thorax, according to mosaic fate mapping results and studies on the reproductive behavior of decapitated females. The location of egg deposition in the culture vial seems to be controlled by a brain site. Sexual behavior in Drosophila does not depend on the presence (or absence) of the ovary or germ line.

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