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Paschoal LRP, Zara FJ. Assessing the ovarian development of Macrobrachium amazonicum (Heller, 1862) phenotypes by means of an integrative analysis. Tissue Cell 2023; 84:102166. [PMID: 37499319 DOI: 10.1016/j.tice.2023.102166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 06/14/2023] [Accepted: 07/13/2023] [Indexed: 07/29/2023]
Abstract
Macrobrachium amazonicum is a species of economic interest with a wide distribution in the Americas and high morphological and reproductive variability. Three phenotypes can be observed in this species: i) large-size amphidromous, ii) large-size and iii) small-size hololimnetic prawns. In the present work, the morphological, histochemical and ultrastructural aspects of ovarian development in the three phenotypes were comparatively analyzed. In addition, the interaction between the ovary and the hepatopancreas was investigated in these phenotypes through the use of gonadosomatic (GSI) and hepatosomatic (HSI) indices. Despite the morphological differences and different reproductive strategies adopted by the females, the macroscopic, histochemical and ultrastructural patterns of ovarian development showed no differences between the phenotypes. The ovaries were macroscopically classified into five stages of development (I to V). In early stages (I and II), the ovaries are full of oogonia, previtellogenic oocytes and oocytes in primary or endogenous vitellogenesis. At these stages, the rough endoplasmic reticulum (RER) produces a granular electron-dense material and sends it to the Golgi apparatus, where it will be modified, compacted and transformed into immature yolk granules. From stage III, secondary or exogenous vitellogenesis begins (with no interruption of endogenous vitellogenesis), where follicular cells nourish the oocytes and extracellular material is absorbed by endocytic vesicles, which fuse with immature yolk granules (forming mature granules) or with existing mature yolk granules. In stages IV and V, secondary vitellogenesis continues and mature yolk granules progressively occupy the cytoplasm. In M. amazonicum, the patterns of increase in oocyte diameter are quite similar between phenotypes, being greater in the small-size phenotype. This is related to the formation of larger oocytes/eggs and the production of large lipid reserves for their larvae. Changes in GSI and HSI during ovarian development show strong similarity between phenotypes, supporting the results obtained by histology and ultrastructure. Females in stages III and IV mobilize hepatopancreas reserves for ovarian maturation, which justifies the higher HSI values recorded in these stages. On the other hand, females in stage V show higher GSI and lower HSI values, indicating a mobilization of resources for the end of ovarian development as the females are ready to spawn.
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Affiliation(s)
- Lucas Rezende Penido Paschoal
- Invertebrate Morphology Laboratory (IML), Department of Biology, Agricultural and Veterinary School of Jaboticabal and Aquaculture Center of UNESP (CAUNESP), São Paulo State University (UNESP), 14884-900, Jaboticabal, São Paulo, Brazil.
| | - Fernando José Zara
- Invertebrate Morphology Laboratory (IML), Department of Biology, Agricultural and Veterinary School of Jaboticabal and Aquaculture Center of UNESP (CAUNESP), São Paulo State University (UNESP), 14884-900, Jaboticabal, São Paulo, Brazil; Postgraduate Course in Biological Sciences (Zoology)/ Ecology, Evolution and Biodiversity (EcoEvoBio), São Paulo State University (UNESP), Biosciences Institute of Rio Claro. 13506-900, Rio Claro, São Paulo, Brazil
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Wahl M, Levy T, Manor R, Aflalo ED, Sagi A, Aizen J. Genes Encoding the Glycoprotein Hormone GPA2/GPB5 and the Receptor LGR1 in a Female Prawn. Front Endocrinol (Lausanne) 2022; 13:823818. [PMID: 35399936 PMCID: PMC8990981 DOI: 10.3389/fendo.2022.823818] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Accepted: 02/17/2022] [Indexed: 11/13/2022] Open
Abstract
In vertebrate reproduction, metabolism, growth and development, essential roles are played by glycoprotein hormones, such as follicle-stimulating hormone (FSH), luteinizing hormone (LH) and thyroid-stimulating hormone (TSH), all of which are heterodimers consisting of two subunits, a structurally identical alpha subunit, and a variable beta subunit, which provides specificity. A 'new' glycoprotein hormone heterodimer identified in both vertebrates and invertebrates, including decapod crustaceans, was shown to be composed of the glycoprotein alpha 2 (GPA2) and glycoprotein beta 5 (GPB5) subunits. The putative receptor for GPA2/GPB5 in invertebrates is the leucine-rich repeat-containing G protein-coupled receptor 1 (LGR1). In this study in the giant freshwater prawn, Macrobrachium rosenbergii, we identified and characterized the GPA2 (MrGPA2), GPB5 (MrGPB5) and LGR1 (MrLGR1) encoding genes and revealed their spatial expression patterns in female animals. Loss-of-function RNA interference (RNAi) experiments in M. rosenbergii females demonstrated a negative correlation between MrGPA2/MrGPB5 silencing and MrLGR1 transcript levels, suggesting a possible ligand-receptor interaction. The relative transcript levels of M. rosenbergii vitellogenin (MrVg) in the hepatopancreas were significantly reduced following MrGPA2/MrGPB5 knockdown. MrLGR1 loss-of-function induced MrVg receptor (MrVgR) transcript levels in the ovary and resulted in significantly larger oocytes in the silenced group compared to the control group. Our results provide insight into the possible role of GPA2/GPB5-LGR1 in female reproduction, as shown by its effect on MrVg and MrVgR expression and on the oocyte development. Here, we suggest that the GPA2/GPB5 heterodimer act as a gonad inhibiting factor in the eyestalk-hepatopancreas-ovary endocrine axis in M. rosenbergii.
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Affiliation(s)
- Melody Wahl
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Tom Levy
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Rivka Manor
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Eliahu D. Aflalo
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- Department of Life Sciences, Achva Academic College, Arugot, Israel
| | - Amir Sagi
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- *Correspondence: Amir Sagi, ; Joseph Aizen,
| | - Joseph Aizen
- The Faculty of Marine Sciences, Ruppin Academic Center, Michmoret, Israel
- *Correspondence: Amir Sagi, ; Joseph Aizen,
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Machado M, Salti FC, Bertini G, Zara FJ, Negreiros-Fransozo ML. Is Potimirim potimirim (Crustacea, Decapoda, Atyidae) a protandric hermaphrodite species? Behavioral and morphological aspects of the reproductive system. ARTHROPOD STRUCTURE & DEVELOPMENT 2021; 63:101060. [PMID: 34049030 DOI: 10.1016/j.asd.2021.101060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 04/26/2021] [Accepted: 04/28/2021] [Indexed: 06/12/2023]
Abstract
We evaluated the mating behavior of Potimirim potimirim in the laboratory based on the assumption that this caridean might be hermaphroditic. We also performed histology and scanning electron microscopy analyses of the reproductive system of females, males, and differentiated individuals. The mating experiments produced three behavioral stages, namely, interaction, lateral positioning, and copulation (which did not necessarily occur in this sequence). The hypothesis of a random pure searching mating was corroborated by the lack of male courtship, postcopulatory guarding, and the high aggregation of individuals. Three macroscopic ovarian stages were recorded in adult females: rudimentary, developing and mature. Secondary vitellogenesis begins at the developing stage, producing mature yolk. The male reproductive system is formed by testes and the vasa deferentia (VD), that is divided into three regions: proximal, middle, and distal. The proximal VD has a typhlosole that produces a thin layer of type II secretion around the central spermatozoa mass immersed in a type I secretion. External and adherent type III secretion is produced from the MVD to DVD, and both compound the primordial spermatophore. Potimirim potimirim has a gonochoric reproductive system and mating behavior and its sexual system does not fit into any of the previously described protandric systems.
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Affiliation(s)
- Marina Machado
- Group of Studies on Crustacean Biology, Ecology and Culture (NEBECC), University of the State of São Paulo (UNESP), Institute of Biosciences, Campus of Botucatu, Zoology Sector, 18618-970, Botucatu, State of São Paulo, Brazil.
| | - Fernanda Cristina Salti
- Invertebrate Morphology Laboratory (LMI), University of the State of São Paulo (UNESP), School of Agricultural and Veterinarian Sciences, Department of Applied Biology, Campus of Jaboticabal, 14884-900, Jaboticabal, State of São Paulo, Brazil
| | - Giovana Bertini
- Laboratory of Biology and Culture of Crustaceans (LABCRUST), University of the State of São Paulo (UNESP), Campus of Registro, 11900-000, Registro, State of São Paulo, Brazil
| | - Fernando José Zara
- Invertebrate Morphology Laboratory (LMI), University of the State of São Paulo (UNESP), School of Agricultural and Veterinarian Sciences, Department of Applied Biology, Campus of Jaboticabal, 14884-900, Jaboticabal, State of São Paulo, Brazil
| | - Maria Lucia Negreiros-Fransozo
- Group of Studies on Crustacean Biology, Ecology and Culture (NEBECC), University of the State of São Paulo (UNESP), Institute of Biosciences, Campus of Botucatu, Zoology Sector, 18618-970, Botucatu, State of São Paulo, Brazil
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Paschoal LRP, Zara FJ. Size at onset of sexual maturity in Macrobrachium amazonicum (Heller, 1862) phenotypes: an integrative approach. AN ACAD BRAS CIENC 2020; 92 Suppl 2:e20180560. [PMID: 32813771 DOI: 10.1590/0001-3675202020180560] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 11/06/2018] [Indexed: 11/22/2022] Open
Abstract
The size at the onset of sexual maturity (SOM) was determined in four hololimnetic populations of Macrobrachium amazonicum using morphometric, physiological and functional criteria. Male prawns from two populations analyzed had hypertrophied chelipeds and large body proportions, showing the presence of four morphotypes, i.e. large-size phenotype (LS). However, the other two populations showed smaller males without morphotypes, i.e. small-size phenotype (SS). The development of sexual weapons in males modulated the mating system and SOM in this species. It was verified that there is a synchrony between physiological and functional maturities in SS males. On the other hand, functional maturity in LS males occurred after physiological and morphological maturities. In females, we verified synchronization between morphological and functional maturities. The results obtained indicated that, in both sexes, physiological maturity anticipates the others criteria. There were no differences between the sequential scheme of sexual maturity for female phenotypes, being: physiological → functional morphological. However, the evaluation of sexual maturity in males must take into account the phenotype of population, since that was modulated by functional maturity. The sequential scheme for LS males is: physiological → morphological → functional, while for SS males it is: physiological = functional → morphological.
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Affiliation(s)
- Lucas R P Paschoal
- Programa de Pós-Graduação em Ciências Biológicas (Zoologia), Universidade Estadual Paulista/UNESP, Rio Claro, SP, Brazil
| | - Fernando J Zara
- Programa de Pós-Graduação em Ciências Biológicas (Zoologia), Universidade Estadual Paulista/UNESP, Rio Claro, SP, Brazil
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Soonthornsumrith B, Saetan J, Kruangkum T, Thongbuakaew T, Senarai T, Palasoon R, Sobhon P, Sretarugsa P. Three-dimensional organization of the brain and distribution of serotonin in the brain and ovary, and its effects on ovarian steroidogenesis in the giant freshwater prawn, Macrobrachium rosenbergii. INVERTEBRATE NEUROSCIENCE 2018; 18:5. [PMID: 29560546 DOI: 10.1007/s10158-018-0209-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Accepted: 03/13/2018] [Indexed: 01/07/2023]
Abstract
The giant freshwater prawn, Macrobrachium rosenbergii, is an economically important crustacean species which has also been extensively used as a model in neuroscience research. The crustacean central nervous system is a highly complex structure, especially the brain. However, little information is available on the brain structure, especially the three-dimensional organization. In this study, we demonstrated the three-dimensional structure and histology of the brain of M. rosenbergii together with the distribution of serotonin (5-HT) in the brain and ovary as well as its effects on ovarian steroidogenesis. The brain of M. rosenbergii consists of three parts: protocerebrum, deutocerebrum and tritocerebrum. Histologically, protocerebrum comprises of neuronal clusters 6-8 and prominent anterior and posterior medial protocerebral neuropils (AMPN/PMPN). The protocerebrum is connected posteriorly to the deutocerebrum which consists of neuronal clusters 9-13, medial antenna I neuropil, a paired lateral antenna I neuropils and olfactory neuropils (ON). Tritocerebrum comprises of neuronal clusters 14-17 with prominent pairs of antenna II (AnN), tegumentary and columnar neuropils (CN). All neuronal clusters are paired structures except numbers 7, 13 and 17 which are single clusters located at the median zone. These neuronal clusters and neuropils are clearly shown in three-dimensional structure of the brain. 5-HT immunoreactivity (-ir) was mostly detected in the medium-sized neurons and neuronal fibers of clusters 6/7, 8, 9, 10 and 14/15 and in many neuropils of the brain including anterior/posterior medial protocerebral neuropils (AMPN/PMPN), protocerebral tract, protocerebral bridge, central body, olfactory neuropil (ON), antennal II neuropil (Ann) and columnar neuropil (CN). In the ovary, the 5-HT-ir was light in the oocyte step 1(Oc1) and very intense in Oc2-Oc4. Using an in vitro assay of an explant of mature ovary, it was shown that 5-HT was able to enhance ovarian estradiol-17β (E2) and progesterone (P4) secretions. We suggest that 5-HT is specifically localized in specific brain areas and ovary of this prawn and it plays a pivotal role in ovarian maturation via the induction of female sex steroid secretions, in turn these steroids may enhance vitellogenesis resulting in oocyte growth and maturation.
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Affiliation(s)
| | - Jirawat Saetan
- Department of Anatomy, Faculty of Science, Prince of Songkla University, Songkhla, 90110, Thailand
| | - Thanapong Kruangkum
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
- Center of Excellence for Shrimp Molecular Biology and Biotechnology (CENTEX Shrimp), Mahidol University, Bangkok, 10400, Thailand
| | - Tipsuda Thongbuakaew
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
- School of Medicine, Walailak University, Thasala District, Nakhonsrithammarat, 80161, Thailand
| | - Thanyaporn Senarai
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
| | - Ronnarong Palasoon
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
- Anatomy Unit, Department of Medical Sciences, Faculty of Science, Rangsit University, Muang Ake, Pathumthani, 12000, Thailand
| | - Prasert Sobhon
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
- Faculty of Allied Health Sciences, Burapha University, Muang, Chonburi, 20131, Thailand
| | - Prapee Sretarugsa
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand.
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6
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Kankuan W, Wanichanon C, Titone R, Engsusophon A, Sumpownon C, Suphamungmee W, Morani F, Masini M, Novelli M, Isidoro C, Sobhon P. Starvation Promotes Autophagy-Associated Maturation of the Ovary in the Giant Freshwater Prawn, Macrobrachium rosenbergii. Front Physiol 2017; 8:300. [PMID: 28553234 PMCID: PMC5427116 DOI: 10.3389/fphys.2017.00300] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 04/25/2017] [Indexed: 01/20/2023] Open
Abstract
Limitation of food availability (starvation) is known to influence the reproductive ability of animals. Autophagy is a lysosomal driven degradation process that protects the cell under metabolic stress conditions, such as during nutrient shortage. Whether, and how starvation-induced autophagy impacts on the maturation and function of reproductive organs in animals are still open questions. In this study, we have investigated the effects of starvation on histological and cellular changes that may be associated with autophagy in the ovary of the giant freshwater prawn, Macrobachium rosenbergii. To this end, the female prawns were daily fed (controls) or unfed (starvation condition) for up to 12 days, and the ovary tissue was analyzed at different time-points. Starvation triggered ovarian maturation, and concomitantly increased the expression of autophagy markers in vitellogenic oocytes. The immunoreactivities for autophagy markers, including Beclin1, LC3-II, and Lamp1, were enhanced in the late oocytes within the mature ovaries, especially at the vitellogenic stages. These markers co-localized with vitellin in the yolk granules within the oocytes, suggesting that autophagy induced by starvation could drive vitellin utilization, thus promoting ovarian maturation.
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Affiliation(s)
- Wilairat Kankuan
- Department of Anatomy, Faculty of Science, Mahidol UniversityBangkok, Thailand.,Laboratory of Molecular Pathology, Department of Health Sciences, Università del Piemonte Orientale "Amedeo Avogadro"Novara, Italy
| | - Chaitip Wanichanon
- Department of Anatomy, Faculty of Science, Mahidol UniversityBangkok, Thailand
| | - Rossella Titone
- Laboratory of Molecular Pathology, Department of Health Sciences, Università del Piemonte Orientale "Amedeo Avogadro"Novara, Italy
| | | | | | | | - Federica Morani
- Laboratory of Molecular Pathology, Department of Health Sciences, Università del Piemonte Orientale "Amedeo Avogadro"Novara, Italy
| | - Matilde Masini
- Department of Translational Research and New Technologies in Medicine and Surgery, University of PisaPisa, Italy
| | - Michela Novelli
- Department of Translational Research and New Technologies in Medicine and Surgery, University of PisaPisa, Italy
| | - Ciro Isidoro
- Laboratory of Molecular Pathology, Department of Health Sciences, Università del Piemonte Orientale "Amedeo Avogadro"Novara, Italy
| | - Prasert Sobhon
- Department of Anatomy, Faculty of Science, Mahidol UniversityBangkok, Thailand.,Faculty of Allied Health Sciences, Burapha UniversityChonburi, Thailand
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Sumpownon C, Engsusophon A, Siangcham T, Sugiyama E, Soonklang N, Meeratana P, Wanichanon C, Hanna PJ, Setou M, Sobhon P. Variation of prostaglandin E2 concentrations in ovaries and its effects on ovarian maturation and oocyte proliferation in the giant fresh water prawn, Macrobrachium rosenbergii. Gen Comp Endocrinol 2015; 223:129-38. [PMID: 25963041 DOI: 10.1016/j.ygcen.2015.04.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 04/16/2015] [Accepted: 04/20/2015] [Indexed: 10/23/2022]
Abstract
Prostaglandins (PGs) are important bioactive mediators for many physiological functions. In some decapod crustaceans, prostaglandin E2 (PGE2) has been detected in reproductive organs, and may play a role in the control of ovarian maturation. However, in the freshwater prawn, Macrobrachium rosenbergii, the presences of PGE2 and key enzymes for PGE2 biosynthesis, as well as its effects on ovarian maturation have not yet been investigated. In this study we reported the presence of PGE2, cyclooxygenase1 (COX1) and prostaglandin E synthase (PGES) in the ovarian tissues of M. rosenbergii, using immunohistochemistry. Intense immunoreactivities of PGE2 (PGE2-ir), COX1 (Cox1-ir) and PGES (PGES-ir) were detected in previtellogenic oocytes (Oc1 and Oc2), while the immunoreactivities were absent in the late vitellogenic oocytes (Oc4). This finding supports the hypothesis that the PGE2 biosynthesis occurs in the ovary of this prawn. To ascertain this finding we used LC-MS/MS to quantitate PGE2 concentrations during ovarian developmental cycle. The levels of PGE2 were significantly higher in the early ovarian stages (St I and II) than in the late stages (St III and IV). Moreover, we found that administration of PGE2 stimulated the ovarian maturation in this species by shortening the length of the ovarian cycle, increasing ovarian-somatic index, oocyte proliferation, and vitellogenin (Vg) level in the hemolymph.
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Affiliation(s)
- Chanudporn Sumpownon
- Department of Anatomy, Faculty of Science, Mahidol University, Rama VI Road, Ratchathewi, Bangkok 10400, Thailand.
| | - Attakorn Engsusophon
- Department of Anatomy, Faculty of Science, Mahidol University, Rama VI Road, Ratchathewi, Bangkok 10400, Thailand
| | - Tanapan Siangcham
- Department of Anatomy, Faculty of Science, Mahidol University, Rama VI Road, Ratchathewi, Bangkok 10400, Thailand
| | - Eiji Sugiyama
- Department of Cell Biology and Anatomy, School of Medicine, Hamamatsu University, Hamamatsu, Shizuoka, Japan
| | - Nantawan Soonklang
- Department of Preclinical Science, Faculty of Medicine, Thammasat University, Pathumthani 12120, Thailand
| | - Prasert Meeratana
- Deparment of Biomedical Sciences, Faculty of Allied Health Sciences, Burapha University, Chonburi 20131, Thailand
| | - Chaitip Wanichanon
- Department of Anatomy, Faculty of Science, Mahidol University, Rama VI Road, Ratchathewi, Bangkok 10400, Thailand
| | - Peter J Hanna
- Department of Anatomy, Faculty of Science, Mahidol University, Rama VI Road, Ratchathewi, Bangkok 10400, Thailand; Pro Vice-Chancellor's Office, Faculty of Science and Technology, Deakin University, Locked Bag 2000, Geelong, Victoria 3220, Australia
| | - Mitsutoshi Setou
- Department of Cell Biology and Anatomy, School of Medicine, Hamamatsu University, Hamamatsu, Shizuoka, Japan
| | - Prasert Sobhon
- Department of Anatomy, Faculty of Science, Mahidol University, Rama VI Road, Ratchathewi, Bangkok 10400, Thailand.
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8
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Petrescu AM, Moldovan L, Zarnescu O. Morphology and ultrastructure of the somatic cells in Astacus leptodactylus ovary. J Morphol 2015; 277:118-27. [PMID: 26453477 DOI: 10.1002/jmor.20484] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 09/15/2015] [Accepted: 09/17/2015] [Indexed: 01/05/2023]
Abstract
We defined the somatic environment in which female germinal cells develop, and performed ultrastructural analyses of various somatic cell types, with particular reference to muscle cells and follicle cells, that reside within the ovary at different stages of oogenesis. Our findings show that ovarian wall of the crayfish is composed of long muscle cells, blood cells, blood vessels and hemal sinuses. The follicle and germinal cells lie within a common compartment of ovarian follicles that is defined by a continuous basal matrix. The follicle cells form branching cords and migrate to surround the developing oocytes. A thick basal matrix separates the ovarian interstitium from ovarian follicles compartment. Transmission electron microscopy shows that inner layer of basal matrix invaginates deeply into the ovarian compartment. Our results suggest that before being surrounded by follicle cells to form follicles, oogonia and early previtellogenic oocytes reside within a niche surrounded by a basal matrix that separates them from ovarian interstitium. We found coated pits and coated vesicles in the cortical cytoplasm of previtellogenic and vitellogenic oocytes, suggesting the receptor mediated endocytosis for transfer of material from the outside of the oocytes, via follicle cells. The interstitial compartment between the inner muscular layer of the ovarian wall and the basal matrix of the ovarian follicle compartment contains muscle cells, hemal sinuses, blood vessels and blood cells. Granular hemocytes, within and outside the vessels, were the most abundant cell population in the ovarian interstitium of crayfish after spawning and in the immature ovary.
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Affiliation(s)
- Ana-Maria Petrescu
- Laboratory of Histology and Developmental Biology, Faculty of Biology, University of Bucharest, Splaiul Independentei 91-95, Bucharest, R-050095, Romania.,Grigore Antipa National Museum of Natural History, Kiseleff 1, Bucharest, R-011341, Romania
| | - Lucia Moldovan
- Department of Cellular and Molecular Biology, National Institute of Research and Development for Biological Sciences, Splaiul Independentei 296, Bucharest, R-060031, Romania
| | - Otilia Zarnescu
- Laboratory of Histology and Developmental Biology, Faculty of Biology, University of Bucharest, Splaiul Independentei 91-95, Bucharest, R-050095, Romania
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9
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Spermatophore affects the egg-spawning and egg-carrying behavior in the female giant freshwater prawn, Macrobrachium rosenbergii. Anim Reprod Sci 2015; 161:129-37. [DOI: 10.1016/j.anireprosci.2015.08.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 08/20/2015] [Accepted: 08/28/2015] [Indexed: 11/18/2022]
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10
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Tinikul Y, Poljaroen J, Tinikul R, Chotwiwatthanakun C, Anuracpreeda P, Hanna PJ, Sobhon P. Alterations in the levels and distribution of octopamine in the central nervous system and ovary of the Pacific white shrimp, Litopenaeus vannamei, and its possible role in ovarian development. Gen Comp Endocrinol 2015; 210:12-22. [PMID: 25305581 DOI: 10.1016/j.ygcen.2014.09.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 09/24/2014] [Accepted: 09/30/2014] [Indexed: 11/21/2022]
Abstract
Octopamine (OA) is a major neurotransmitter that has not been studied in the Pacific white shrimp, Litopenaeus vannamei. Therefore, we investigated changes in OA levels, its distribution in regions of the central nervous system (CNS) and ovary during the ovarian maturation cycle, as well as its possible role in regulating ovarian maturation. OA exhibited the highest concentration in the brain and thoracic ganglia at ovarian stage II, and then declined to the lowest concentration at ovarian stages III and IV. In the cerebral ganglia, OA-immunoreactivity (OA-ir) was present in neurons of clusters 6, 17, the anterior and posterior medial protocerebral, olfactory, antenna II, and tegumentary neuropils. In the circumesophageal, subesophageal, thoracic ganglia and abdominal ganglia, OA-ir was detected in several neuropils, neurons and fibers. The high level of intensity in OA immunostaining was observed in early developmental stage of oocyte by comparison with low level of OA-ir in late stages of oocyte development. Functionally, OA-injected female shrimps at doses of 2.5×10(-7) and 2.5×10(-6)mol/shrimp, showed significantly decreased gonado-somatic indices, oocyte diameters, and hemolymph vitellogenin levels, compared with control groups. This study showed changes of OA in the CNS and ovary reaching the highest level in early ovarian stages and declining in late stages, and it decreased hemolymph vitellogenin levels, suggesting significant involvement of OA in female reproduction in this species.
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Affiliation(s)
- Yotsawan Tinikul
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Mahidol University, Nakhonsawan Campus, Nakhonsawan 60130, Thailand.
| | - Jaruwan Poljaroen
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Mahidol University, Nakhonsawan Campus, Nakhonsawan 60130, Thailand
| | - Ruchanok Tinikul
- Mahidol University, Nakhonsawan Campus, Nakhonsawan 60130, Thailand
| | - Charoonroj Chotwiwatthanakun
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Mahidol University, Nakhonsawan Campus, Nakhonsawan 60130, Thailand
| | - Panat Anuracpreeda
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Agricultural Science Division, Mahidol University, Kanchanaburi Campus, Saiyok, Kanchanaburi 71150, Thailand
| | - Peter J Hanna
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Pro Vice-Chancellor's Office, Faculty of Science and Technology, Deakin University, Locked Bay 20000, Geelong, VIC 3220, Australia
| | - Prasert Sobhon
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
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Saetan J, Senarai T, Tamtin M, Weerachatyanukul W, Chavadej J, Hanna PJ, Parhar I, Sobhon P, Sretarugsa P. Histological organization of the central nervous system and distribution of a gonadotropin-releasing hormone-like peptide in the blue crab, Portunus pelagicus. Cell Tissue Res 2013; 353:493-510. [PMID: 23733265 DOI: 10.1007/s00441-013-1650-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Accepted: 04/22/2013] [Indexed: 12/24/2022]
Abstract
We present a detailed histological description of the central nervous system (CNS: brain, subesophageal ganglion, thoracic ganglia, abdominal ganglia) of the blue crab, Portunus pelagicus. Because the presence of gonadotropin-releasing hormone (GnRH) in crustaceans has been disputed, we examine the presence and localization of a GnRH-like peptide in the CNS of the blue crab by using antibodies against lamprey GnRH (lGnRH)-III, octopus GnRH (octGnRH) and tunicate GnRH (tGnRH)-I. These antibodies showed no cross-reactivity with red-pigment-concentrating hormone, adipokinetic hormone, or corazonin. In the brain, strong lGnRH-III immunoreactivity (-ir) was detected in small (7-17 μm diameter) neurons of clusters 8, 9 and 10, in medium-sized (21-36 μm diameter) neurons of clusters 6, 7 and 11 and in the anterior and posterior median protocerebral neuropils, olfactory neuropil, median and lateral antenna I neuropils, tegumentary neuropil and antenna II neuropil. In the subesophageal ganglion, lGnRH-III-ir was detected in medium-sized neurons and in the subesophageal neuropil. In the thoracic and abdominal ganglia, lGnRH-III-ir was detected in medium-sized and small neurons and in the neuropils. OctGnRH-ir was observed in neurons of the same clusters with moderate staining, particularly in the deutocerebrum, whereas tGnRH-I-ir was only detected in medium-sized neurons of cluster 11 in the brain. Thus, anti-lGnRH-III shows greater immunoreactivity in the crab CNS than anti-octGnRH and anti-tGnRH-I. Moreover, our functional bioassay demonstrates that only lGnRH-III has significant stimulatory effects on ovarian growth and maturation. We therefore conclude that, although the true identity of the crab GnRH eludes us, crabs possess a putative GnRH hormone similar to lGnRH-III. The identification and characterization of this molecule is part of our ongoing research.
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Affiliation(s)
- Jirawat Saetan
- Department of Anatomy, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok, 10400, Thailand
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