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Ndiaye PI, Bakhoum AJS, Sène A, Diagne PM, Miquel J. The ultrastructural characters of the mature spermatozoon ofOpechona bacillaris(Molin, 1859) (Digenea, Lepocreadiidae) a parasite ofScomber coliasGmelin, 1789 (Scombridae) off the coast of Dakar (Senegal). ACTA ZOOL-STOCKHOLM 2013. [DOI: 10.1111/azo.12054] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Świderski Z, Poddubnaya LG, Zhokhov AE, Miquel J, Gibson DI. An ultrastructural study of the egg wall surrounding the miracidium of the digenean Brandesia turgida () (Plagiorchiida: Pleurogenidae), with the description of a unique cocoon-like envelope. ZOOL ANZ 2013. [DOI: 10.1016/j.jcz.2013.09.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Bâ A, Ndiaye PI, Bâ CT, Miquel J. Ultrastructure of the spermatozoon of Anomotaenia quelea (Mettrick, 1961) (Cestoda, Cyclophyllidea, Dilepididae), an intestinal parasite of Quelea quelea (Aves, Ploceidae) in Senegal. ZOOL ANZ 2013. [DOI: 10.1016/j.jcz.2013.08.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Miquel J, Vourc'h-Jourdain M, Thomas C, Cassagnau E, Stalder JF, Barbarot S. Relapsing lymphomatoid papulosis after allogenic bone-marrow transplant. Clin Exp Dermatol 2013; 38:741-4. [DOI: 10.1111/ced.12101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/10/2012] [Indexed: 12/01/2022]
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Miquel J, Vilavella D, Swiderski Z, Shimalov VV, Torres J. Spermatological characteristics of Pleurogenidae (Digenea) inferred from the ultrastructural study of Pleurogenes claviger, Pleurogenoides medians and Prosotocus confusus. ACTA ACUST UNITED AC 2013; 20:28. [PMID: 23985167 PMCID: PMC3756337 DOI: 10.1051/parasite/2013028] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Accepted: 08/16/2013] [Indexed: 11/24/2022]
Abstract
The present work constitutes the first ultrastructural analysis of the spermatozoon in the Pleurogenidae, with the study of three species belonging to three of the 16 genera included in this family, namely Pleurogenes claviger, Pleurogenoides medians and Prosotocus confusus. The mature spermatozoa of these pleurogenids present two axonemes of the 9+“1” trepaxonematan pattern, a nucleus, two mitochondria, two bundles of parallel cortical microtubules, external ornamentation, spine-like bodies and granules of glycogen. The organization of these characters in the sperm cell is similar in the three species. Thus, the anterior spermatozoon extremity is filiform and a continuous and submembranous layer of parallel cortical microtubules surrounds the axonemes at their anterior end. The posterior spermatozoon extremity exhibits the second axoneme and corresponds to the Cryptogonimidean type of Quilichini et al. (2010). Slight differences were noted between the spermatozoon of P. confusus and those of the two remaining species in the location of mitochondria.
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Swiderski Z, Miquel J, Torres J, Delgado E. Early intrauterine embryonic development of the bothriocephalidean cestode Clestobothrium crassiceps (Rudolphi, 1819), a parasite of the teleost Merluccius merluccius (L., 1758) (Gadiformes: Merlucciidae). C R Biol 2013; 336:321-30. [PMID: 23932252 DOI: 10.1016/j.crvi.2013.06.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 05/31/2013] [Accepted: 06/01/2013] [Indexed: 11/19/2022]
Abstract
The early intrauterine embryonic development of the bothriocephalidean cestode Clestobothrium crassiceps (Rudolphi, 1819), a parasite of the teleost Merluccius merluccius (L., 1758), was studied by means of light (LM) and transmission electron microscopy (TEM). Contrary to the generic diagnosis given in the CABI Keys to the cestode parasites of vertebrates, the eggs of C. crassiceps, the type of species of Clestobothrium Lühe, 1899, are operculate and embryonated. Our LM and TEM results provide direct evidence that an operculum is present and that the eggs exhibit various stages of intrauterine embryonic development, and in fact represent a good example of early ovoviviparity. The intrauterine eggs of this species are polylecithal and contain numerous vitellocytes, generally ∼30, which are pushed to the periphery and remain close to the eggshell, whereas the dividing zygote and later the early embryo remain in the egg centre. During early intrauterine embryonic development, several cleavage divisions take place, which result in the formation of three types of blastomeres, i.e. macro-, meso- and micromeres. These can be readily differentiated at the TEM level, not only by their size, but also by the ultrastructural characteristics of their nuclei and cytoplasmic organelles. The total number of blastomeres in these early embryos, enclosed within the electron-dense eggshells, can be up to ∼20 cells of various sizes and characteristics. Mitotic divisions of early blastomeres were frequently observed at both LM and TEM levels. Simultaneously with the mitotic cleavage divisions leading to blastomere multiplication and their rapid differentiation, there is also a deterioration of some blastomeres, mainly micromeres. A similar degeneration of vitellocytes begins even earlier. Both processes show a progressive degeneration of both vitellocytes and micromeres, and are good examples of apoptosis, a process that provides nutritive substances, including lipids, for the developing embryo.
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Swiderski Z, Miquel J, Montoliu I, Feliu C, Gibson DI. Ultrastructure of the intrauterine eggs of the microphallid trematode Maritrema feliui: evidence of early embryonic development. Parasitol Res 2013; 112:3325-33. [PMID: 23839172 DOI: 10.1007/s00436-013-3512-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 06/17/2013] [Indexed: 11/24/2022]
Abstract
Intrauterine embryonic development in the microphallid trematode Maritrema feliui is examined by means of transmission electron microscopy. Both fertilization and eggshell formation take place in the ootype. The eggshell is formed from a shell globule material derived from the vitelline cells combined with secretions of Mehlis' gland. The proximal uterus is packed with unembryonated eggs of the oligolecithal type, each composed of a fertilized oocyte and several vitelline cells, all surrounded by the shell. Intrauterine embryonic development of the egg is followed to the early stage of outer embryonic envelope formation, resulting in an embryo of ~20 blastomeres of three different types: macromeres, mesomeres and micromeres. The first equal cleavage division of the zygote produces two macromeres. The outer envelope is of cellular origin and formed by the cytoplasmic fusion of two macromeres, which become situated at opposite poles in the peripheral layer of the embryo just beneath the eggshell. Simultaneously, other blastomeres multiply and differentiate, whereas several micromeres exhibit clear signs of degeneration or apoptosis. These results show that the embryonic development of M. feliui starts in utero and represents an example of early stage ovoviviparity. A reduction in the number of blastomeres results from a continued degeneration of micromeres, which after autolysis and re-absorption, appear to represent an important source of nutritive reserves for the embryo. The embryonic development of this digenean is discussed in relation to its life cycle.
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Caussé S, Aubert H, Saint-Jean M, Puzenat E, Bursztejn AC, Eschard C, Mahé E, Maruani A, Mazereeuw-Hautier J, Dreyfus I, Miquel J, Chiaverini C, Boccara O, Hadj-Rabia S, Stalder JF, Barbarot S. Propranolol-resistant infantile haemangiomas. Br J Dermatol 2013; 169:125-9. [DOI: 10.1111/bjd.12417] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/30/2013] [Indexed: 11/26/2022]
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Veciana M, Chaisiri K, Morand S, Miquel J, Ribas A. New biogeographical and morphological information on Physaloptera ngoci Le-Van-Hoa, 1961 (Nematoda: Physalopteridae) in South-east Asian rodents. ACTA ACUST UNITED AC 2013; 20:23. [PMID: 23815881 PMCID: PMC3718517 DOI: 10.1051/parasite/2013023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Accepted: 06/11/2013] [Indexed: 11/14/2022]
Abstract
During a study of the helminth fauna of 1,643 rodents trapped along the Mekong River (Thailand, Lao People's Democratic Republic and Cambodia) in 2008-2011, the spirurid nematode Physaloptera ngoci Le-Van-Hoa, 1961 was recovered with an overall prevalence of 2.8%. Based on the original description, it was identified in nine of 23 different Murinae host species and is here reported for the first time from these three countries. A scanning electron microscopy study provides additional morphological data.
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Miquel J, Świderski Z. Spermatological characteristics of the Trypanorhyncha inferred from new ultrastructural data on species of Tentaculariidae, Eutetrarhynchidae, and Progrillotiidae. C R Biol 2013; 336:65-72. [PMID: 23608175 DOI: 10.1016/j.crvi.2013.02.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 02/16/2013] [Accepted: 02/17/2013] [Indexed: 11/24/2022]
Abstract
The present study focuses on the ultrastructural characteristics of both spermiogenesis and the spermatozoon in the order Trypanorhyncha. New ultrastructural data are presented for two species of the unexplored superfamily Tentacularioidea, Nybelinia queenslandensis, and Kotorella pronosoma. The present study also provides supplementary data on the superfamily Eutetrarhynchoidea, with the analysis of spermiogenesis and spermatozoon of two progrillotiids, Progrillotia dasyatidis and Pro. pastinacae, and new ultrastructural data concerning spermiogenesis in the eutetrarhynchids Dollfusiella spinulifera and Parachristianella trygonis. Spermiogenesis in trypanorhynchs follows the Bâ and Marchand's type I and the ultrastructural organisation of the mature spermatozoon corresponds to the Levron et al.'s type I. The most remarkable characters concerns the number of electron-dense plates constituting the intercentriolar body during spermiogenesis and in the variability of the arc-like row of thick cortical microtubules present in the anterior areas of the spermatozoon because of its variability according to the species.
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Bakhoum AJ, Ribas A, Eira C, Bâ CT, Miquel J. Brachycoelium salamandrae (Frölich, 1789) (Digenea: Brachycoeliidae): Ultrastructural study of spermiogenesis and the mature spermatozoon. ZOOL ANZ 2013. [DOI: 10.1016/j.jcz.2012.05.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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87
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Larrubia JR, Lokhande MU, García-Garzón S, Miquel J, González-Praetorius A, Parra-Cid T, Sanz-de-Villalobos E. Persistent hepatitis C virus (HCV) infection impairs HCV-specific cytotoxic T cell reactivity through Mcl-1/Bim imbalance due to CD127 down-regulation. J Viral Hepat 2013; 20:85-94. [PMID: 23301543 DOI: 10.1111/j.1365-2893.2012.01618.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
In persistent hepatitis C virus (HCV) infection, HCV-specific cytotoxic T lymphocyte (CTL) reactivity is impaired and this affects HCV control. Interleukin-7 receptor (CD127) expression on these cells could regulate CTL reactivity through Mcl-1/Bim balance modulation. Bim is a pro-apoptotic molecule blocked by the action of Mcl-1. Mcl-1/Bim expression and T cell reactivity on HCV-specific CTLs were compared according to CD127 phenotype. Peripheral blood lymphocytes (PBL) from HLA-A2(+) HCV(+) patients were obtained. HCV-specific CTLs were visualized by staining PBL with anti-CD8 and HLA-A2/peptide pentameric complexes (pentamer). Mcl-1/Bim/CD127 phenotype of HCV-specific CTLs was tested by staining detectable CD8(+)/pentamer(+) cells with anti-Mcl-1/Bim/CD127 antibodies. HCV-specific CTL proliferation ability after specific in vitro challenge was tested in the presence and absence of pancaspase inhibitor z-VAD-fmk. All stained cells were analysed by flow cytometry. CD127(low)-expressing HCV-specific CTLs associated with high HCV viraemia, while CD127(high) correlated with undetectable viral loads (P < 0.001). Directly ex vivo, pentamer(+) cell frequency was similar according to CD127 expression level. Nevertheless, CD127(low) pentamer(+) cell proliferation after specific in vitro challenge was impaired (P < 0.05), although this was corrected by z-VAD-fmk treatment (P < 0.05). Mcl-1 expression was low directly ex vivo (P < 0.01), and Bim was up-regulated after antigen encounter (P < 0.05) of CD127(low) pentamer(+) cells. The ex vivo difference between Mcl-1 and Bim expression on pentamer(+) cells correlated positively with CD127 expression level (P < 0.001) and with pentamer(+) cell reactivity (P < 0.05). In summary, a low ex vivo Mcl-1 expression and Bim up-regulation after antigen encounter are involved in CD127(low) HCV-specific CTL hyporeactivity during chronic infection, but it can be overcome by apoptosis blockade.
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Ronceray S, Miquel J, Lucas A, Le Gall F, Dupuy A. Syndrome d’Ehlers-Danlos de type VIII : une cause d’ulcères de jambes chez le sujet jeune. Ann Dermatol Venereol 2012. [DOI: 10.1016/j.annder.2012.10.295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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89
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Kacem H, Bakhoum AJ, Eira C, Neifar L, Miquel J. Ultrastructural characters of the spermatozoon of the digenean Hypocreadium caputvadum Kacem et al., 2011 (Lepocreadioidea: Lepocreadiidae), an intestinal parasite of Balistes capriscus in Tunisia. C R Biol 2012. [PMID: 23199631 DOI: 10.1016/j.crvi.2012.10.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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90
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Ibnou Ndiaye P, Diagne PM, Sène A, Bakhoum AJ, Miquel J. Ultrastructure of the spermatozoon of the digenean Lecithocladium excisum (Rudolphi, 1819) (Hemiuroidea: Hemiuridae), a parasite of marine teleosts in Senegal. Folia Parasitol (Praha) 2012; 59:173-8. [DOI: 10.14411/fp.2012.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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91
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Świderski Z, Miquel J, Marigo AM, Gibson DI. Ultrastructure of vitellogenesis and vitellocytes in the trypanorhynch cestode Aporhynchus menezesi, a parasite of the velvet belly lanternshark Etmopterus spinax. C R Biol 2012; 335:573-84. [PMID: 23026088 DOI: 10.1016/j.crvi.2012.07.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Revised: 07/20/2012] [Accepted: 07/21/2012] [Indexed: 10/28/2022]
Abstract
This is the first TEM examination of vitellogenesis in the cestode Aporhynchus menezesi, a parasite of the velvet belly lanternshark Etmopterus spinax and a member of a little-studied trypanorhynch family, the Aporhynchidae. The synthetic activity of vitellocytes plays two important functions in the developmental biology of cestodes: (1) their shell-globules serve in eggshell formation; and (2) their accumulated reserves of glycogen and lipids represent a food source for the developing embryo. In A. menezesi, vitelline follicles consist of cells at various stages of development, from peripheral, immature cells of the gonial type to mature cells towards the centre of the follicle. These stages are: (I) immature; (II) early differentiation; (III) advanced maturation; and (IV) mature. Gradual changes involved in this process occur within each stage. Vitellogenesis involves: (1) an increase in cell volume; (2) the development of a smooth endoplasmic reticulum and an accelerated formation and accumulation of both unsaturated and saturated lipid droplets, along with their continuous enlargement and fusion; (3) the formation of individual β-glycogen particles and their accumulation in the form of glycogen islands scattered among lipid droplets in the cytoplasm of maturing and mature vitellocytes; (4) the rapid accumulation of large, moderately saturated lipid droplets accompanied by dense accumulations of β-glycogen along with proteinaceous shell-globules or shell-globule clusters in the peripheral layer during the advanced stage of maturation; (5) the development of cisternae of granular endoplasmic reticulum that produce dense, proteinaceous shell-globules; (6) the development of Golgi complexes engaged in the packaging of this material; and (7) the progressive and continuous enlargement of shell-globules into very large clusters in the peripheral layer during the advanced stage of maturation. Vitellogenesis in A. menezesi, only to some extent, resembles that previously described for four other trypanorhynchs. It differs in: (i) the reversed order of secretory activities in the differentiating vitellocytes, namely the accumulation of large lipid droplets accompanied by glycogenesis or β-glycogen formation during early differentiation (stage II), i.e. before the secretory activity, which is predominantly protein synthesis for shell-globule formation (stage III); (ii) the very heavy accumulation of large lipid droplets during the final stage of cytodifferentiation (stage IV); and (iii) the small number of β-glycogen particles present in mature vitellocytes. Ultracytochemical staining with PA-TCH-SP for glycogen proved positive for a small number of β-glycogen particles in differentiating and mature vitellocytes. Hypotheses, concerning the interrelationships of patterns of vitellogenesis, possible modes of egg formation, embryonic development and life-cycles, are commented upon.
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Miquel J, Chevrant-Breton J, Dupuy A, Le Gall F, Bourdon-Lannoy E, Adamski H, Bodemer C. [Eruptive naevi in epidermolysis bullosa hereditaria patients]. Ann Dermatol Venereol 2012; 139:435-43. [PMID: 22721475 DOI: 10.1016/j.annder.2012.03.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Revised: 01/18/2012] [Accepted: 03/16/2012] [Indexed: 01/10/2023]
Abstract
BACKGROUND EB naevus (EBN) are little-known, atypical, eruptive, pigmented melanocytic lesions that may occur in former sites of bullae occurring in epidermolysis bullosa hereditaria (EBH). We sought to describe the characteristics of such lesions and assess their course. PATIENTS AND METHODS This was a retrospective, two-centre study in which data was collated from the medical files of patients with EBN. We analyzed the patients' demographical data as well as the clinical, dermatoscopic, pathological features of EBN and their progression. RESULTS Eight patients were studied: they were principally Caucasian (5/8), with a sex ratio of 1. All variants of EBH were represented and most were recessive (63%). We analysed 22 EBN, all atypical and emerging before the age of 10 years (73%), ubiquitously distributed and measuring greater than 5 cm(2) (25%). Of the 13 EBN subjected to dermatoscopy, 12 exhibited a benign reticular pattern. Four were biopsied, and analysis revealed three common naevi and one lentigo. After a median follow-up of 8 years, the EBN seen were either stable (68%), had regressed (23%) or had disappeared (one case). No cases of melanoma were diagnosed. DISCUSSION EBN are acquired and atypical pigmented naevi. Sixty-four cases of EBN have been reported in the literature up to date. The dermatoscopic features may be evocative of melanoma (17/23 EBN), but to our knowledge no cases of melanoma at a naevus site have been reported. Recessive transmission of EBH appears to be a risk factor (63% of cases), a finding supported by certain pathophysiological hypotheses. CONCLUSION EBN present atypical clinical and dermatoscopic features. However, while prophylactic total excision did not appear warranted in the absence of any reported cases of melanoma, regular clinical follow-up is recommended.
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Khaldi M, Torres J, Samsó B, Miquel J, Biche M, Benyettou M, Barech G, Benelkadi HA, Ribas A. Endoparasites (Helminths and Coccidians) in the HedgehogsAtelerix algirusandParaechinus aethiopicusfrom Algeria. AFRICAN ZOOLOGY 2012. [DOI: 10.3377/004.047.0114] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Marigo AM, Levron C, Bâ CT, Miquel J. Ultrastructural study of spermiogenesis and the spermatozoon of the proteocephalidean cestode Barsonella lafoni de Chambrier et al., 2009, a parasite of the catfish Clarias gariepinus (Burchell, 1822) (Siluriformes, Clariidae). ZOOL ANZ 2012. [DOI: 10.1016/j.jcz.2011.08.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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95
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Bakhoum AJS, Feliu C, Bâ CT, Miquel J. Spermiogenesis and spermatozoon of the liver fluke Mediogonimus jourdanei (Microphalloidea: Prosthogonimidae), a parasite of Myodes glareolus (Rodentia: Cricetidae). Folia Parasitol (Praha) 2012; 59:32-42. [PMID: 22439426 DOI: 10.14411/fp.2012.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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96
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Swiderski Z, Bakhoum AJS, Montoliu I, Feliu C, Gibson DI, Miquel J. Ultrastructural study of vitellogenesis in Maritrema feliui (Digenea, Microphallidae). Parasitol Res 2011; 109:1707-14. [PMID: 21573812 DOI: 10.1007/s00436-011-2444-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Accepted: 05/03/2011] [Indexed: 11/29/2022]
Abstract
During vitellogenesis in the microphallid trematode Maritrema feliui, we distinguished four stages: (I) a stem cell stage of the gonial type; (II) an early differentiation stage with the main cell activity concentrated on the initiation of protein synthetic activity and the beginning of shell globule formation; (III) an advanced differentiation stage concentrated on a rapid intensification of protein synthetic activity, the progressive fusion of individual shell globules into large shell globule clusters and the formation of saturated lipid droplets and a small amount of β-glycogen particles in the peripheral cytoplasm, considered as a store of nutritive reserves for the developing embryos; and (IV) the mature vitellocyte. Early vitellocyte maturation is characterised by: (1) an increase in cell volume; (2) extensive development of large, labyrinth-like cisternae of GER that produce proteinaceous granules; (3) the development of Golgi complexes engaged in packaging this material; and (4) a continuous enlargement of proteinaceous granules within vacuoles and their transformation into shell globule clusters composed of the heterogeneous material observed during vitellocyte cytodifferentiation. Mature vitelline cells are very rich in two types of cell inclusions accumulated in large amounts in their cytoplasm: (1) shell globule clusters, which play an important role in eggshell formation; and (2) a few osmiophobic lipid droplets of a saturated nature that undoubtedly represent nutritive reserves for the developing embryos. In addition, there are small numbers of β-glycogen particles in the peripheral cytoplasm of mature vitellocytes of this species. The general pattern and ultrastructure of vitellogenesis in M. feliui greatly resembles those observed in another microphallid trematode, Maritrema linguilla, in other digeneans and in some lower cestodes. Quantitative and qualitative variations in lipids (saturated and unsaturated) and glycogen (α-glycogen rosettes and β-glycogen particles) during platyhelminth vitellogenesis between the different species of trematodes and some lower cestodes are identified and discussed.
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Marigo AM, Eira C, Bâ CT, Miquel J. Spermiogenesis and spermatozoon ultrastructure of the diphyllidean cestode Echinobothrium euterpes (Neifar, Tyler and Euzet 2001) Tyler 2006, a parasite of the common guitarfish Rhinobatos rhinobatos. Parasitol Res 2011; 109:809-21. [DOI: 10.1007/s00436-011-2327-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Accepted: 02/23/2011] [Indexed: 11/30/2022]
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98
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Mama Marigo A, Świderski Z, Tidiane Bâ C, Miquel J. Spermiogenesis and ultrastructure of the spermatozoon of the trypanorhynch cestode Aporhynchus menezesi (Aporhynchidae), a parasite of the velvet belly lanternshark Etmopterus spinax (Elasmobranchii: Etmopteridae). Folia Parasitol (Praha) 2011; 58:69-78. [DOI: 10.14411/fp.2011.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Bakhoum A, Torres J, Shimalov V, Bâ C, Miquel J. Spermiogenesis and spermatozoon ultrastructure of Diplodiscus subclavatus (Pallas, 1760) (Paramphistomoidea, Diplodiscidae), an intestinal fluke of the pool frog Rana lessonae (Amphibia, Anura). Parasitol Int 2011; 60:64-74. [PMID: 20974288 DOI: 10.1016/j.parint.2010.10.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 10/17/2010] [Accepted: 10/18/2010] [Indexed: 11/24/2022]
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Levron C, Miquel J, Oros M, Scholz T. Spermatozoa of tapeworms (Platyhelminthes, Eucestoda): advances in ultrastructural and phylogenetic studies. Biol Rev Camb Philos Soc 2010; 85:523-43. [PMID: 20015312 DOI: 10.1111/j.1469-185x.2009.00114.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
New data on spermiogenesis and the ultrastructure of spermatozoa of 'true' tapeworms (Eucestoda) are summarized. Since 2001, more than 50 species belonging to most orders of the Eucestoda have been studied or reinvestigated, particularly members of the Caryophyllidea, Spathebothriidea, Diphyllobothriidea, Bothriocephalidea, Trypanorhyncha, Tetraphyllidea, Proteocephalidea, and Cyclophyllidea. A new classification of spermatozoa of eucestodes into seven basic types is proposed and a key to their identification is given. For the first time, a phylogenetic tree inferred from spermatological characters is provided. New information obtained in the last decade has made it possible to fill numerous gaps in the character data matrix, enabling us to carry out a more reliable analysis of the evolution of ultrastructural characters of sperm and spermiogenesis in eucestodes. The tree is broadly congruent with those based on morphological and molecular data, indicating that convergent evolution of sperm characters in cestodes may not be as common as in other invertebrate taxa. The main gaps in the current knowledge of spermatological characters are mapped and topics for future research are outlined, with special emphasis on those characters that might provide additional information about the evolution of tapeworms and their spermatozoa. Future studies should be focused on representatives of those major groups (families and orders) in which molecular data indicate paraphyly or polyphyly (e.g. 'Tetraphyllidea' and Trypanorhyncha) and on those that have a key phylogenetic position among eucestodes (e.g. Diphyllidea, 'Tetraphyllidea', Lecanicephalidea, Nippotaeniidea).
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