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Katow H, Katow T, Yoshida H, Kiyomoto M. Involvement of Huntingtin in Development and Ciliary Beating Regulation of Larvae of the Sea Urchin, Hemicentrotus pulcherrimus. Int J Mol Sci 2021; 22:5116. [PMID: 34066037 PMCID: PMC8151597 DOI: 10.3390/ijms22105116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/29/2021] [Accepted: 05/03/2021] [Indexed: 11/16/2022] Open
Abstract
The multiple functions of the wild type Huntington's disease protein of the sea urchin Hemicentrotus pulcherrimus (Hp-Htt) have been examined using the anti-Hp-Htt antibody (Ab) raised against synthetic oligopeptides. According to immunoblotting, Hp-Htt was detected as a single band at around the 350 kDa region at the swimming blastula stage to the prism larva stage. From the 2-arm pluteus stage (2aPL), however, an additional smaller band at the 165 kDa region appeared. Immunohistochemically, Hp-Htt was detected in the nuclei and the nearby cytoplasm of the ectodermal cells from the swimming blastula stage, and the blastocoelar cells from the mid-gastrula stage. The Ab-positive signal was converged to the ciliary band-associated strand (CBAS). There, it was accompanied by several CBAS-marker proteins in the cytoplasm, such as glutamate decarboxylase. Application of Hp-Htt morpholino (Hp-Htt-MO) has resulted in shortened larval arms, accompanied by decreased 5-bromo-2-deoxyuridin (BrdU) incorporation by the ectodermal cells of the larval arms. Hp-Htt-MO also resulted in lowered ciliary beating activity, accompanied by a disordered swirling pattern formation around the body. These Hp-Htt-MO-induced deficiencies took place after the onset of CBAS system formation at the larval arms. Thus, Hp-Htt is involved in cell proliferation and the ciliary beating pattern regulation signaling system in pluteus larvae.
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Affiliation(s)
- Hideki Katow
- Institute of Development, Aging and Cancer, Tohoku University, Sendai 980-8575, Japan; (H.Y.); (M.K.)
- Research Center for Marine Biology, Tohoku University, Aomori 039-3501, Japan;
| | - Tomoko Katow
- Research Center for Marine Biology, Tohoku University, Aomori 039-3501, Japan;
| | - Hiromi Yoshida
- Institute of Development, Aging and Cancer, Tohoku University, Sendai 980-8575, Japan; (H.Y.); (M.K.)
| | - Masato Kiyomoto
- Institute of Development, Aging and Cancer, Tohoku University, Sendai 980-8575, Japan; (H.Y.); (M.K.)
- Marine and Coastal Research Center, Ochanomizu University, Chiba 294-0301, Japan
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Minokawa T. Comparative studies on the skeletogenic mesenchyme of echinoids. Dev Biol 2017; 427:212-218. [PMID: 27856261 DOI: 10.1016/j.ydbio.2016.11.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Revised: 10/25/2016] [Accepted: 11/14/2016] [Indexed: 11/16/2022]
Abstract
Skeletogenic mesenchyme cells in echinoids are suitable for studying developmental mechanisms, and have been used extensively. Most of these studies have been performed on species in the order Camarodonta, which are modern echinoids (subclass Euechinoidea) and are considered "model" echinoid species. In contrast, species belonging to other orders are studied less frequently, especially investigations of their molecular developmental biology such as gene regulatory networks. Recent studies on mesenchyme development in non-camarodont species suggest that these species are potential sources of comparative information to elucidate the mechanisms underlying skeletogenic mesenchyme development. In this review, the importance of using comparative data to understand development and evolution is discussed.
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Affiliation(s)
- Takuya Minokawa
- Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University, 9 Sakamoto, Asamushi, Aomori, Aomori 039-3501, Japan.
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3
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Yamazaki A, Minokawa T. Roles of hesC and gcm in echinoid larval mesenchyme cell development. Dev Growth Differ 2016; 58:315-26. [PMID: 27046223 DOI: 10.1111/dgd.12277] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 02/12/2016] [Accepted: 02/15/2016] [Indexed: 11/28/2022]
Abstract
To understand the roles of hesC and gcm during larval mesenchyme specification and differentiation in echinoids, we performed perturbation experiments for these genes in two distantly related euechinoids, Hemicentrotus pulcherrimus and Scaphechinus mirabilis. The number of larval mesenchyme cells increased when the translation of hesC was inhibited, thereby suggesting that hesC has a general role in larval mesenchyme development. We confirmed previous results by demonstrating that gcm is involved in pigment cell differentiation. Simultaneous inhibition of the translation of hesC and gcm induced a significant increase in the number of skeletogenic cells, which suggests that gcm functions in skeletogenic fate repression. Based on these observations, we suggest that: (i) hesC participates in some general aspects of mesenchymal cell development; and (ii) gcm is involved in the mechanism responsible for the binary specification of skeletogenic and pigment cell fates.
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Affiliation(s)
- Atsuko Yamazaki
- Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University, 9 Sakamoto, Asamushi, Aomori, Aomori, 039-3501, Japan
| | - Takuya Minokawa
- Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University, 9 Sakamoto, Asamushi, Aomori, Aomori, 039-3501, Japan
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Yamazaki A, Minokawa T. Expession patterns of mesenchyme specification genes in two distantly related echinoids, Glyptocidaris crenularis and Echinocardium cordatum. Gene Expr Patterns 2015; 17:87-97. [PMID: 25801498 DOI: 10.1016/j.gep.2015.03.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 03/13/2015] [Accepted: 03/14/2015] [Indexed: 10/23/2022]
Abstract
The molecular mechanism of the larval mesenchyme cell specification in echinoids has been well analyzed. However, most of the data have been provided by studies of a single group of echinoids, the order Camarodonta. Little is known about this mechanism in other echinoid orders. We examined the expression patterns of mesenchyme specification genes, micro1, hesC, alx1, tbr, ets1, cyp1, and gcm, in the two non-Camarodonta echinoids, Glyptocidaris crenularis and Echinocardium cordatum. We found that the expression patterns of some genes contained characteristics that were unique to one of the species; others were shared by the two species. Some of the shared characteristics of G. crenularis and E. cordatum are not found in the species belonging to Camarodonta, suggesting the derived status of this order. The expression of ets1 in E. cordatum aboral ectoderm is one of the molecular level modifications possibly related to an evolutionarily novel larval structure, the posterior process. Our results suggest that a considerable number of modifications in the mesenchyme specification mechanisms have been introduced during the echinoid evolution.
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Affiliation(s)
- Atsuko Yamazaki
- Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University, 9 Sakamoto, Asamushi, Aomori, Aomori 039-3501, Japan
| | - Takuya Minokawa
- Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University, 9 Sakamoto, Asamushi, Aomori, Aomori 039-3501, Japan.
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Yaguchi S, Yaguchi J, Inaba K. bicaudal-C is required for the formation of anterior neurogenic ectoderm in the sea urchin embryo. Sci Rep 2014; 4:6852. [PMID: 25358387 PMCID: PMC4215294 DOI: 10.1038/srep06852] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 10/10/2014] [Indexed: 02/07/2023] Open
Abstract
bicaudal-C (bicC) mRNA encodes a protein containing RNA-binding domains that is reported to be maternally present with deflection in the oocytes/eggs of some species. The translated protein plays a critical role in the regulation of cell fate specification along the body axis during early embryogenesis in flies and frogs. However, it is unclear how it functions in eggs in which bicC mRNA is uniformly distributed, for instance, sea urchin eggs. Here, we show the function of BicC in the formation of neurogenic ectoderm of the sea urchin embryo. Loss-of-function experiments reveal that BicC is required for serotonergic neurogenesis and for expression of ankAT-1 gene, which is essential for the formation of apical tuft cilia in the neurogenic ectoderm of the sea urchin embryo. In contrast, the expression of FoxQ2, the neurogenic ectoderm specification transcription factor, is invariant in BicC morphants. Because FoxQ2 is an upstream factor of serotonergic neurogenesis and ankAT-1 expression, these data indicate that BicC functions in regulating the events that are coordinated by FoxQ2 during sea urchin embryogenesis.
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Affiliation(s)
- Shunsuke Yaguchi
- Shimoda Marine Research Center, University of Tsukuba, 5-10-1 Shimoda, Shizuoka 415-0025, Japan
- Japanese Association for Marine Biology (JAMBIO)
| | - Junko Yaguchi
- Shimoda Marine Research Center, University of Tsukuba, 5-10-1 Shimoda, Shizuoka 415-0025, Japan
- JSPS
| | - Kazuo Inaba
- Shimoda Marine Research Center, University of Tsukuba, 5-10-1 Shimoda, Shizuoka 415-0025, Japan
- Japanese Association for Marine Biology (JAMBIO)
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6
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Yamazaki A, Kidachi Y, Yamaguchi M, Minokawa T. Larval mesenchyme cell specification in the primitive echinoid occurs independently of the double-negative gate. Development 2014; 141:2669-79. [PMID: 24924196 DOI: 10.1242/dev.104331] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Echinoids (sea urchins) are divided into two major groups - cidaroids (a 'primitive' group) and euechinoids (a 'derived' group). The cidaroids are a promising model species for understanding the ancestral developmental mechanisms in echinoids, but little is known about the molecular mechanisms of cidaroid development. In euechinoids, skeletogenic mesenchyme cell specification is regulated by the double-negative gate (DNG), in which hesC represses the transcription of the downstream mesenchyme specification genes (alx1, tbr and ets1), thereby defining the prospective mesenchyme region. To estimate the ancestral mechanism of larval mesenchyme cell specification in echinoids, the expression patterns and roles of mesenchyme specification genes in the cidaroid Prionocidaris baculosa were examined. The present study reveals that the expression pattern and function of hesC in P. baculosa were inconsistent with the DNG model, suggesting that the euechinoid-type DNG is not utilized during cidaroid mesenchyme specification. In contrast with hesC, the expression patterns and functions of alx1, tbr and ets1 were similar between P. baculosa and euechinoids. Based on these results, we propose that the roles of alx1, tbr and ets1 in mesenchyme specification were established in the common ancestor of echinoids, and that the DNG system was acquired in the euechinoid lineage after divergence from the cidaroid ancestor. The evolutionary timing of the establishment of the DNG suggests that the DNG was originally related to micromere and/or primary mesenchyme cell formation but not to skeletogenic cell differentiation.
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Affiliation(s)
- Atsuko Yamazaki
- Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University, 9 Sakamoto, Asamushi, Aomori, Aomori 039-3501, Japan
| | - Yumi Kidachi
- Department of Pharmacy, Faculty of Pharmaceutical Sciences, Aomori University, 2-3-1 Kobata, Aomori, Aomori 030-0943, Japan
| | - Masaaki Yamaguchi
- Division of Life Science, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takuya Minokawa
- Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University, 9 Sakamoto, Asamushi, Aomori, Aomori 039-3501, Japan
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Shiomi K, Yamazaki A, Kagawa M, Kiyomoto M, Yamaguchi M. Par6 regulates skeletogenesis and gut differentiation in sea urchin larvae. Dev Genes Evol 2012; 222:269-78. [PMID: 22903233 DOI: 10.1007/s00427-012-0409-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Accepted: 06/15/2012] [Indexed: 12/30/2022]
Abstract
Partitioning-defective (par) genes were originally identified as genes that are essential for the asymmetric division of the Caenorhabditis elegans zygote. Studies have since revealed that the gene products are part of an evolutionarily conserved PAR-atypical protein kinase C system involved in cell polarity in various biological contexts. In this study, we analyzed the function of par6 during sea urchin morphogenesis by morpholino-mediated knockdown and by manipulation swapping of the primary mesenchyme cells (PMCs). Loss of Par6 resulted in defects in skeletogenesis and gut differentiation in larvae. Phenotypic analyses of chimeras constructed by PMC swapping showed that Par6 in non-PMCs is required for differentiation of archenteron into functional gut. In contrast, Par6 in both PMCs and ectodermal cells cooperatively regulates skeletogenesis. We suggest that Par6 in PMCs plays an immediate role in the deposition of biomineral in the syncytial cable, whereas Par6 in ectoderm may stabilize skeletal rods via an unknown signal(s).
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Affiliation(s)
- Kosuke Shiomi
- Division of Life Science, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
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Kiyomoto M, Morinaga S, Ooi N. Distinct embryotoxic effects of lithium appeared in a new assessment model of the sea urchin: the whole embryo assay and the blastomere culture assay. ECOTOXICOLOGY (LONDON, ENGLAND) 2010; 19:563-570. [PMID: 20020201 DOI: 10.1007/s10646-009-0452-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/02/2009] [Indexed: 05/28/2023]
Abstract
Early embryogenesis is one of the most sensitive and critical stages in animal development. Here we propose a new assessment model on the effect of pollutant to multicellular organism development. That is a comparison between the whole embryo assay and the blastomere culture assay. We examined the LiCl effect on the sea urchin early development in both of whole embryos and the culture of isolated blastomeres. The mesoderm and endoderm region were capable to differentiate into skeletogenic cells when they were isolated at 60-cell stage and cultured in vitro. The embryo developed to exogastrula by the vegetalizing effect of the same LiCl condition where ectodermal region changed their fate to endoderm, while the isolated blastomeres from the presumptive ectoderm region differentiated into skeletogenic cells in the culture with LiCl. The effect of LiCl to the sea urchin embryo and to the dissociated blastomere is a unique example where same cells response distinctly to the same agent depend on the condition around them. Present results show the importance of examining the process in cellular and tissue levels for the exact understanding on the morphological effect of chemicals and metals.
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Affiliation(s)
- Masato Kiyomoto
- Marine and Coastal Research Center, Ochanomizu University, Tateyama, Chiba, Japan.
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9
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Fujii T, Sakamoto N, Ochiai H, Fujita K, Okamitsu Y, Sumiyoshi N, Minokawa T, Yamamoto T. Role of the nanos homolog during sea urchin development. Dev Dyn 2010; 238:2511-21. [PMID: 19705446 DOI: 10.1002/dvdy.22074] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The nanos genes play important roles in the development of primordial germ cells in animal species. In the sea urchin, Hemicentrotus pulcherrimus, small micromere descendants specifically express HpNanos mRNA and this expression continues in the left coelomic pouch, which produces the major component of the adult rudiment. In this study, we showed that morpholino knockdown of HpNanos resulted in a delay of primary mesenchyme cell ingression and a decrease in the number of cells comprising the left coelomic pouch. Knockdown analysis in chimeras and whole embryos revealed the disappearance of small micromere descendants from the archenteron tip. Furthermore, the expression of HpNanos mRNA was induced in other cell lineages in the HpNanos-knockdown and micromere-deleted embryos. Taken together, our results suggest that HpNanos is involved in the inductive interaction of small micromere descendants with other cell lineages, and that HpNanos is required for the survival of small micromere descendants.
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Affiliation(s)
- Takayoshi Fujii
- Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Japan
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10
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Kiyomoto M, Zito F, Costa C, Poma V, Sciarrino S, Matranga V. Skeletogenesis by transfated secondary mesenchyme cells is dependent on extracellular matrix-ectoderm interactions in Paracentrotus lividus sea urchin embryos. Dev Growth Differ 2007; 49:731-41. [DOI: 10.1111/j.1440-169x.2007.00967.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yajima M, Kiyomoto M. Study of larval and adult skeletogenic cells in developing sea urchin larvae. THE BIOLOGICAL BULLETIN 2006; 211:183-92. [PMID: 17062877 DOI: 10.2307/4134592] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The larval skeleton of sea urchin embryos is formed by primary mesenchyme cells (PMCs). Thereafter, the larvae start feeding and additional arms develop. An adult rudiment that contains spines, tube feet, tests, and other parts of the adult body is formed in the eight-armed larva. The cellular mechanism of the later skeletogenesis and the lineage of the adult skeletogenic cells are not known. In this study, the morphogenesis of larval and adult skeletons during larval development of the sea urchin Hemicentrotus pulcherrimus was investigated by immunostaining cells with PMC-specific monoclonal antibodies, which are useful markers of skeletogenic cells. All spicules and the associated cells in the later larvae were stained with the antibodies. We could observe the initiation of skeletal morphogenesis at each developmental stage and visualize the cellular basis of skeleton formation in whole-mount embryos that possessed an intact morphology. There were some similarities between PMCs and the later skeletogenic cells. Both had a rounded shape with some filopodia, and the antigen expression started just before overt spicule formation. In the later-stage embryos, cells with filopodia and faint antigen expression were observed migrating in the blastocoel or aggregating in the presumptive location of new skeletogenesis.
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Affiliation(s)
- Mamiko Yajima
- Tateyama Marine Laboratory, Marine and Coastal Research Center, Ochanomizu University, 11 Koyatsu, Tateyama, Chiba 294-0301, Japan
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Nishimura Y, Sato T, Morita Y, Yamazaki A, Akasaka K, Yamaguchi M. Structure, regulation, and function of micro1 in the sea urchin Hemicentrotus pulcherrimus. Dev Genes Evol 2004; 214:525-36. [PMID: 15480758 DOI: 10.1007/s00427-004-0442-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2004] [Accepted: 08/13/2004] [Indexed: 10/26/2022]
Abstract
The animal-vegetal axis of sea urchin embryos is morphologically apparent at the 16-cell stage, when the mesomeres, macromeres, and micromeres align along it. At this stage, the micromere is the only autonomously specified blastomere that functions as a signaling center. We used a subtraction PCR survey to identify the homeobox gene micro1 as a micromere-specific gene. The micro1 gene is a representative of a novel family of paired-like class homeobox genes, along with PlHbox12 from Paracentrotus lividus and pmar1 from Strongylocentrotus purpuratus. In the present study, we showed that micro1 is a multicopy gene with six or more polymorphic loci, at least three of which are clustered in a 30-kb region of the genome. The micro1 gene is transiently expressed during early cleavage stages in the micromere. Recently, nuclear beta-catenin was shown to be essential for the specification of vegetal cell fates, including micromeres, and the temporal and spatial coincidence of micro1 expression with the nuclear entry of beta-catenin is highly suggestive. We demonstrated that micro1 is a direct target of beta-catenin. In addition, we showed that micro1 is necessary and sufficient for micromere specification. These observations on the structure, regulation, and function of micro1 lead to the conclusion that micro1 and pmar1 (and potentially PlHbox12) are orthologous.
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Affiliation(s)
- Yukiko Nishimura
- Division of Life Science, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
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Hamada M, Kiyomoto M. Signals from primary mesenchyme cells regulate endoderm differentiation in the sea urchin embryo. Dev Growth Differ 2003; 45:339-50. [PMID: 12950275 DOI: 10.1046/j.1440-169x.2003.00702.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Primary mesenchyme cells (PMC), the skeletogenic cells derived from the micromeres of the sea urchin embryo, are involved in the differentiation of the gut. When PMC were deleted from the mesenchyme blastula, both formation of the constrictions in the gut and expression of endoderm-specific alkaline phosphatase were significantly delayed. Therefore, the correct timing of gut differentiation depends on the existence of PMC, probably via a type of promotive signal. To date, the only role of PMC in other tissue differentiation has been a suppressive signal for the conversion of secondary mesenchyme cells (SMC) into skeletogenic cells. The present experiments using PMC ablation and transplantation showed that both signaling processes occurred in the same short period during gastrulation, but the embryos kept their competence for gut differentiation until a later stage. Further investigations indicated that conversion of SMC did not cause delay in gut differentiation and that SMC did not mediate the PMC signal to the endoderm. Therefore, the effect of PMC on gut differentiation could be a new role that is independent of the suppressive effect for SMC conversion.
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Affiliation(s)
- Mayuko Hamada
- Tateyama Marine Laboratory, Ochanomizu University, Kou-yatsu 11, Tateyama, Chiba 294-0301, Japan
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Katow H, Washio M. Pamlin-induced tyrosine phosphorylation of SUp62 protein in primary mesenchyme cells during early embryogenesis in the sea urchin, Hemicentrotus pulcherrimus. Dev Growth Differ 2000; 42:519-29. [PMID: 11041493 DOI: 10.1046/j.1440-169x.2000.00533.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Ingression of primary mesenchyme cells (PMC) is associated with the encounter of basal lamina including pamlin. It was found that sea urchin embryos have a protein that binds antihuman focal adhesion kinase (FAK) antibodies, yet it has a 62 kDa homo-dimeric structure. Thus, this protein was distinctive from known FAK, and was named SUp62. In mesenchyme blastulae, one of the subunits increased its apparent molecular mass slightly but distinctively, then restored the original molecular mass in early gastrulae. This temporal and stage-specific shifting of the molecular mass was associated with the occurrence of tyrosine phosphorylation of a subunit that did not increase the apparent molecular mass. Herbimycin A induced the hyperphosphorylation of tyrosine residues of SUp62, and inhibited the occurrence of molecular mass shifting. Immunohistochemistry showed a strong positive signal of SUp62 and phosphotyrosine in PMC. Herbimycin A also severely but reversibly inhibited PMC dissociation, migration and gastrulation. Tyrosine phosphorylation of SUp62 was induced when PMC were incubated with pamlin in vitro, and it was initiated within 10 min after onset of the incubation. It reached its peak in 1 h, and declined gradually in the next 1 h, indicating that pamlin-induced tyrosine phosphorylation of SUp62 occurs closely associated with acquiring PMC migration activity.
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Affiliation(s)
- H Katow
- Marine Biological Station, Graduate School of Science, University of Tohoku, Asamushi, Aomori, Japan.
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15
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Kitajima T, Urakami H. Differential distribution of spicule matrix proteins in the sea urchin embryo skeleton. Dev Growth Differ 2000; 42:295-306. [PMID: 10969729 DOI: 10.1046/j.1440-169x.2000.00513.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Spicule matrix proteins are the products of primary mesenchyme cells, and are present in calcite spicules of the sea urchin embryo. To study their possible roles in skeletal morphogenesis, monoclonal antibodies against SM50, SM30 and another spicule matrix protein (29 kDa) were obtained. The distribution of these proteins in the embryo skeleton was observed by immunofluorescent staining. In addition, their distribution inside the spicules was examined by a 'spicule blot' procedure, direct immunoblotting of proteins embedded in crystallized spicules. Our observations showed that SM50 and 29 kDa proteins were enriched both outside and inside the triradiate spicules of the gastrulae, and also existed in the corresponding portions of growing spicules in later embryos and micromere cultures. The straight extensions of the triradiate spicules and thickened portions of body rods in pluteus spicules were also rich in these proteins. The SM30 protein was only faintly detected along the surface of spicules. By examination using the spicule blot procedure, however, SM30 was clearly detectable inside the body rods and postoral rods. These results indicate that SM50 and 29 kDa proteins are concentrated in radially growing portions of the spicules (normal to the c-axis of calcite), while SM30 protein is in the longitudinally growing portions (parallel to the c-axis). Such differential distribution suggests the involvement of these proteins in calcite growth during the formation of three-dimensionally branched spicules.
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Affiliation(s)
- T Kitajima
- Department of Biology, Tokyo Metropolitan University, Hachioji, Japan.
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16
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Brown MF, Partin JS, Killian CE, Lennarz WJ. Spiculogenesis in the sea urchin embryo: Studies on the SM30 spicule matrix protein. Dev Growth Differ 1995. [DOI: 10.1046/j.1440-169x.1995.00008.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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Tamboline CR, Burke RD. Secondary mesenchyme of the sea urchin embryo: ontogeny of blastocoelar cells. THE JOURNAL OF EXPERIMENTAL ZOOLOGY 1992; 262:51-60. [PMID: 1583452 DOI: 10.1002/jez.1402620108] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Secondary mesenchyme in sea urchin embryos is released into the blastocoel after primary mesenchyme, and although these cells have been recognized for some time, we lack knowledge about many fundamental aspects of their origin and fate. Here we documented the ontogeny of one of the principal, and least well-known, types of cells derived from secondary mesenchyme. The blastocoelar cells arise from mesenchyme released from the tip of the archenteron following the initial phase of gastrulation. The cells migrate with their cell bodies suspended in the blastocoel, rather than being apposed to the basal lamina like primary mesenchyme. The cells extend numerous fine filopodia to form a network of cytoplasmic processes around the gut, along the skeletal rods, and within the larval arms. Once the network is formed, the cells maintain their positions, although they actively translocate vesicles and cytoplasm along their filopodia. Cell counts indicate there is an initial recruitment of cells during gastrulation, followed by a more gradual increase in cell number after the larva begins to feed. Lineage studies in which 16-cell-stage macromeres were injected with horseradish peroxidase indicate that almost all of the macromere-derived mesenchyme forms pigment cells and blastocoelar cells. We propose that blastocoelar cells are a distinct subset of secondary mesenchyme that forms fibroblast-like cells in the blastocoel of sea urchin embryos.
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Affiliation(s)
- C R Tamboline
- Department of Biology, University of Victoria, B.C. Canada
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Shimizu-Nishikawa K, Katow H, Matsuda R. Micromere Differentiation in the Sea Urchin Embryo: Immunochemical Characterization of Primary Mesenchyme Cell-Specific Antigen and Its Biological Roles. (sea urchin/primary mesenchyme cell/monoclonal antibody/spicule formation/cell migration). Dev Growth Differ 1990. [DOI: 10.1111/j.1440-169x.1990.00629.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
A monoclonal antibody, Sp12, binds to cortical granules, the hyaline layer, and skeletogenic, chromogenic, and blastocoelar mesenchyme of sea urchin eggs and embryos. Adult urchins also express Sp12 antigens in the dermal layer of the test and spines. Antigen is expressed on the surface of primary mesenchyme cells after they have entered the blastocoel, and by two secondary mesenchyme derivatives--the blastocoelar cells after they have been released from the tip of the archenteron, and the pigment cells in prism stage embryos. Immunogold localizations show antigen on the surfaces of mesenchyme, within membrane bounded vesicles, and associated with the Golgi apparatus. Western blots of antigens immunoprecipitated from seven developmental stages reveal twelve antigens ranging in Mr from 35 k to 240 k. Most of these antigens appear, disappear or change Mr over the first five days of development. Characterizations of this complex array of antigens show that the epitope recognized by Sp12 is eliminated by proteolytic enzymes and endoglycosidase F, while immunoreactivity is only reduced by periodate oxidation. As well, calcium magnesium free seawater extracts a subset of antigens different from that retained by crude membrane preparations. It is proposed that the mesenchyme of sea urchin embryos produces a family of developmentally regulated cell surface and extracellular matrix glycoproteins which all exhibit a carbohydrate epitope recognized by Sp12.
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Affiliation(s)
- C R Tamboline
- Department of Biology, University of Victoria, British Columbia, Canada
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Katow H. Characterization of Vegetal Plate Cells Separated from Cytochalasin B-Treated Blastulae of the Sea Urchin, Clypeaster japonicus. (cytochalasin B/cell isolation/presumptive primary mesenchyme cell/vegetal plate cell/sea urchin). Dev Growth Differ 1989. [DOI: 10.1111/j.1440-169x.1989.00439.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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