The Glandular Tissue in the Testis of <i>Salamandra salamandra</i> (L.) (Amphibia, Urodela)

Bergmann, Martin; Schindelmeiser, Jochen; Greven, Hartmut

doi:10.1111/j.1463-6395.1983.tb00790.x

Cited by 9 publications

(3 citation statements)

References 17 publications

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“…As observed in other amphibians (Lofts 1974;Bergmann et al 1983;Uribe 2003), in the testis of L. italicus each Sertoli cell is in contact with a single germ cell throughout spermiogenesis. The synchronous development of a cyst suggests possible interactions between germinal and Sertoli cells: the latter may provide structural and functional support.…”

Section: Reproductive Systemmentioning

confidence: 79%

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Male reproductive system in the Italian newt Lissotriton italicus (Peracca 1898) (Amphibia, Urodela): ultrastructural and morphological study with description of spermiogenesis, spermatozoon and spermatophore

et al. 2009

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The Wrst morphological and ultrastructural description of testis, WolYan duct, spermatophore, and spermatozoon of Lissotriton italicus is provided. The male reproductive system of this species consists of a pair of monolobed testes, fat bodies, eVerent ductules, paired WolYan duct, and the cloaca. The WolYan duct is pseudostratiWed, consisting of an epithelium composed of an alternation of ciliated cells and non-ciliated secretory cells, with scattered basal cells. Melanocytes are found in the basal lamina of the WolYan duct. Spermiogenesis is of the discontinuous type. In the early spermatid nuclear elongation, Xagellar extrusion and development of a large acrosomal vesicle occur. Soon the perforatorium develops and the Xagellum elongates. In the late spermatid gradual chromatin condensation and nuclear elongation is noticeable. At the end of spermiogenesis the Xagellum develops marginal Wlament and undulating membrane. The mature sperm of L. italicus consists of a distinct head (acrosome, perforatorium, nucleus and nuclear ridge, plus the apical acrosomal barb) and a tail with axoneme, undulating membrane, and axial Wber. Nuclear ridge and apical acrosomal barb are two autapomorphic characters found in the Urodela. Several apomorphic characters for Salamandroidea are also present: elongation of the connecting piece, an apically modiWed acrosome vesicle, trifoliate axial Wber within the principal piece, elongate annulus, elongate midpiece, and the gentle merging of the axial Wber/principal piece into the endpiece. The spermatophore of L. italicus is formed by a cap consisting of randomly distributed spermatozoa surmounting a short pedicel. A membranelike structure involving the spermatophore is absent.

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Section: Reproductive Systemmentioning

confidence: 79%

“…Few data exist on cell types in urodeles WolYan ducts: most accounts describe only a mono-layer cubical to prismatic (Lofts 1974;Bergmann et al 1983), but Uribe (2003) recognized columnar, cuboidal and spherical or ovoid cells.…”

Section: Reproductive Systemmentioning

confidence: 98%

Male reproductive system in the Italian newt Lissotriton italicus (Peracca 1898) (Amphibia, Urodela): ultrastructural and morphological study with description of spermiogenesis, spermatozoon and spermatophore

et al. 2009

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“…In the developing glandular tissue, hypertrophied lobule boundary cells surround the follicle cells occluding the lobule lumen. The follicle cells degenerate and the mature glandular tissue is formed by a parenchymal strand of cells originating from the lobule boundary cells, embedded by the vascularised connective interstitial tissue (Lofts, 1974 ;Bergmann et al 1983 ;Fraile et al 1990).…”

Section: mentioning

confidence: 99%

Carbohydrate moieties of the interstitial and glandular tissues of the amphibian Pleurodeles waltl testis shown by lectin histochemistry

et al. 2001

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The amphibian testis is a useful model because of its zonal organisation in lobules, distributed along the cephalocaudal axis, each containing a unique germ cell type. Sperm empty lobules form the so‐called glandular tissue at the posterior region of the gonad. Androgen production is limited to the cells of the interstitial tissue surrounding lobules with spermatozoa bundles and to the cells of the glandular tissue. In this work, we have studied the distribution of terminal carbohydrate moieties of N‐ and O‐linked oligosaccharides in the interstitial and glandular tissue of the Pleurodeles waltl testis, by means of 14 lectins combined with chemical and enzymatic deglycosylation pretreatment. Some differences in glycan composition between the interstitial and the glandular tissue have been detected. Thus in both tissues, N‐linked oligosaccharides contained mannose, Gal(β1,4)GlcNAc, and Neu5Ac(α2,3)Gal(β1,4)GlcNAc, while O‐linked oligosaccharides contained Con A‐positive mannose, Gal(β1,3)GalNAc, Gal(β1,4)GlcNAc, Neu5Ac(α2,3)Gal(β1,4)GlcNAc, and WGA‐positive GlcNAc. Fucose was also detected in both tissues. However, GlcNAc on N‐linked oligosaccharides and GalNAc and Neu5Ac(α2,6)Gal/GalNAc on both N‐ and O‐linked oligosaccharides were found only in the interstitial tissue. As glandular tissue cells arise from the innermost cells of interstitial tissue that surround lobules, the differences in the glycan composition of interstitial and glandular tissue shown in this work may be related to the start of androgen synthesis when steroid hormone (SH)‐secreting cells develop.

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The blood‐testis barrier and sertoli cell junctions: Structural considerations

Pelletier

Byers

1992

Microscopy Res & Technique

153

110

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In this review, a few well-established axioms have been challenged while others were viewed from a new perspective. The extensive literature on the blood-testis barrier has been scrutinized to help probe its mechanics and hopefully to promote understanding of the constant adaptation of the barrier function to germ cell development. Our principal conclusions are as follows: (1) Although the barrier zonule is topographically located at the base of the seminiferous epithelium it actually encircles the apex of the Sertoli cell. Consequently the long irregular processes specialized in holding and shaping the developing germ cells should be considered as apical appendages analogous to microvilli. (2) The development of the barrier zonule does not coincide with the appearance of a particular class of germ cells. (3) The barrier compartmentalizes the epithelium into only two cellular compartments: basal and lumenal. (4) Although the blood-testis barrier does sequester germ cells usually considered antigenic, immunoregulator factors other than the physical barrier seem to be involved in preventing autoimmune orchitis. (5) Structurally, a Sertoli cell junctional complex is composed of occluding, gap, close, and adhering junctions. The Sertoli cell membrane segments facing germ cells are presumably included in the continuum of the Sertoli cell junctional complex that extends all over the lateral and apical Sertoli cell membranes. (6) The modulation (i.e., formation and dismantling) of the junctions in a baso-apical direction is characteristic of the seminiferous epithelium and may be dictated by germ cell differentiation. The formation of tubulobulbar complexes and the following internalization of junction vesicles conceivably represent sequential steps of a single intricate junction elimination process that involves junction membrane segments from different cell types as part of a continual cell membrane recycling system. (7) The preferential association of junctional particles with one or the other fracture-face reflect a response to various stimuli including seasonal breeding. Changes in the affinity of the particles are generally coincidental with cytoskeletal changes. However, changes in the cytoskeleton are not necessarily accompanied by permeability changes. The number of strands seems to reflect neither the junctional permeability nor the transepithelial resistance. The diverse orientation of the strands seems to be related to the plasticity of the Sertoli cell occluding zonule. (8) Cooperation between all constituents (Sertoli cells, myoid cells, cell substratum, and germ cells) of the epithelium seems essential for the barrier zonule to function in synchrony with the germ cell differentiation.(ABSTRACT TRUNCATED AT 400 WORDS)

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The Glandular Tissue in the Testis of Salamandra salamandra (L.) (Amphibia, Urodela)

Cited by 9 publications

References 17 publications

Male reproductive system in the Italian newt Lissotriton italicus (Peracca 1898) (Amphibia, Urodela): ultrastructural and morphological study with description of spermiogenesis, spermatozoon and spermatophore

Male reproductive system in the Italian newt Lissotriton italicus (Peracca 1898) (Amphibia, Urodela): ultrastructural and morphological study with description of spermiogenesis, spermatozoon and spermatophore

Carbohydrate moieties of the interstitial and glandular tissues of the amphibian Pleurodeles waltl testis shown by lectin histochemistry

The blood‐testis barrier and sertoli cell junctions: Structural considerations

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