The gonadal cycle of captive white bream, <i>Diplodus sargus</i> (L.)

Micale, V.; Perdichizzi, F.; Santangelo, Giovanni

doi:10.1111/j.1095-8649.1987.tb05247.x

Cited by 37 publications

(25 citation statements)

References 8 publications

(6 reference statements)

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“…Thus, in the gametogenic activity and spawning stages some macrophages have been described in the interstitial tissue of the rainbow trout testis (Loir et al 1995) whereas in the post-spawning stage a high population of phagocyte cells has been described in several teleost fish (Henderson 1962, Shrestha & Khanna 1976, Carrillo & Zanuy 1977, Billard 1986, Scott & Sumpter 1989, Lahnsteiner & Patzner 1990, Loir et al 1995. Moreover, macrophages, granulocytes and lymphocytes have been described in the testis of some sparid fish, although only macrophages have been shown to be phagocytic (Micale et al 1987, Besseau & Faliex 1994, Bruslé-Sicard & Fourcault 1997. An important difference between mammalian and fish testicular leucocytes is that in mammals the leucocyte infiltration of the testis begins with an inflammation process, whereas in fish the same process is a physiological one which starts at the end of the spawning stage and is presumably regulated by sex hormones.…”

Section: Discussionmentioning

confidence: 99%

A role for acidophilic granulocytes in the testis of the gilthead seabream (Sparus aurata L., Teleostei)

Chaves-Pozo

Pelegrı́n²,

Mulero³

et al. 2003

Journal of Endocrinology

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In mammals, a complex interaction between the immune and the reproductive systems has been described, in which testicular immune cells produce cytokines and growth factors which modulate gonad functions, while specific gonad cells influence the immune response in this organ. In this study we describe the presence of acidophilic granulocytes in the testis of the hermaphrodite teleost fish gilthead seabream (Sparus aurata L.) by using a specific monoclonal antibody. During the post-spawning stage of the testis, this cell type appears in the germinal compartment, accumulates interleukin (IL)-1 and does not seem to be involved in the phagocytosis of degenerating cells. Moreover, in vitro, 11-ketotestosterone and 17 -oestradiol, the principal fish sexual steroids, regulate the respiratory burst activity of acidophilic granulocytes obtained from the head-kidney (the bone marrow equivalent in fish) and the intracellular accumulation of IL-1 by these cells. It is likely, therefore, that IL-1 produced by testicular acidophilic granulocytes regulates important functions of the testis in fish.

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Section: Discussionmentioning

confidence: 99%

A role for acidophilic granulocytes in the testis of the gilthead seabream (Sparus aurata L., Teleostei)

Chaves-Pozo

Pelegrı́n²,

Mulero³

et al. 2003

Journal of Endocrinology

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“…In contrast, little attention has been paid to the interstitial tissue, even though it probably plays a pivotal role in the reorganization of the testis during postspawning. In some teleost species, a marked increase of interstitial tissue, the vacuolization of interstitial cells, and the presence of macrophages after the shedding of spermatozoa have been observed by conventional microscopy [5,10,11]. Moreover, Sertoli cells, alone or together with macrophages, have been observed to be involved in germ cell elimination in teleosts [12,13].…”

Section: Introductionmentioning

confidence: 94%

An Overview of Cell Renewal in the Testis Throughout the Reproductive Cycle of a Seasonal Breeding Teleost, the Gilthead Seabream (Sparus aurata L)1

Chaves-Pozo

Mulero

Meseguer

et al. 2005

Biology of Reproduction

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The gilthead seabream is a protandrous hermaphrodite seasonal breeding teleost with a bisexual gonad that offers an interesting model for studying the testicular regression process that occurs in both seasonal testicular involution and sex change. Insofar as fish reproduction is concerned, little is known about cell renewal and elimination during the reproductive cycle of seasonal breeding teleosts with asynchronous spermatogenesis. We have previously described how acidophilic granulocytes infiltrate the testis during postspawning where, surprisingly, they produce interleukin-1beta, a known growth factor for mammalian spermatogonia, rather than being directly involved in the elimination of degenerative germ cells. In this study, we are able to discriminate between spermatogonia stem cells and primary spermatogonia according to their nuclear and cytoplasmic diameters and location in the germinal epithelium, finding that these two cell types, together with Sertoli cells, proliferate throughout the reproductive cycle with a rate that depends on the reproductive stage. Thus, during spermatogenesis the spermatogonia stem cells, the Sertoli cells, and the developing germ cells (primary spermatogonia, A and B spermatogonia, and spermatocytes) in the germinal compartment, and cells with fibroblast-shaped nuclei in the interstitial tissue proliferate. However, during spawning, the testis shows few proliferating cells. During postspawning, the resumption of proliferation, the occurrence of apoptotic spermatogonia, and the phagocytosis of nonshed spermatozoa by Sertoli cells lead to a reorganization of both the germinal compartment and the interstitial tissue. Finally, the proliferation of spermatogonia increases during resting when, unexpectedly, both oogonia and oocytes also proliferate. This proliferative pattern was correlated with the gonadosomatic index, testicular morphology, and testicular and gonad areas, suggesting that complex mechanisms operate in the regulation of gonocyte proliferation in hermaphrodite fish.

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“…Thus, compared with what happens in post-spawning, the resting stage was characterized by an increase in the number of proliferative cells and no apoptotic cells (Chaves-Pozo et al, 2005a), while, during the testicular involution stage, the number of proliferative cells were similar and the number of apoptotic cells increased as did the size of the necrotic areas . The ovarian area showed proliferative activity during both resting and testicular involution stages, at a rate that did not differed from the proliferative activity that have been described during each resting stage of the male phase in several sparid species (Micale et al, 1987). However, only during testicular involution the immature oocytes (pre-perinucleolar and perinucleolar) developed and the first vitellogenic oocytes appeared .…”

Section: Characterization Of Immune Cells and Molecules In The Gonadsmentioning

confidence: 45%

Immunocytochemical Tools Reveal a New Research Field Between the Boundaries of Immunology and Reproductive Biology in Teleosts

García‐Ayala¹,

Chaves-Pozo²

2012

Applications of Immunocytochemistry

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The gonadal cycle of captive white bream, Diplodus sargus (L.)

Cited by 37 publications

References 8 publications

A role for acidophilic granulocytes in the testis of the gilthead seabream (Sparus aurata L., Teleostei)

A role for acidophilic granulocytes in the testis of the gilthead seabream (Sparus aurata L., Teleostei)

An Overview of Cell Renewal in the Testis Throughout the Reproductive Cycle of a Seasonal Breeding Teleost, the Gilthead Seabream (Sparus aurata L)1

Immunocytochemical Tools Reveal a New Research Field Between the Boundaries of Immunology and Reproductive Biology in Teleosts

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