Intranuclear and cytoplasmic annulate lamellae in grasshopper spermatocytes (Genus Melanoplus)

Pool, Thomas B.; Hoage, Terrell R.

doi:10.1007/bf00225107

Cited by 10 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, it is tempting to speculate that the ER-related sructures take part in inhibin synthesis. Although the cellular origin of this protein [Franchimont et al, 1977] is not yet well known, it has been suggested that the spermatids might play a role in this synthesis [Setchell et al, 1977], AL have been described in a great variety of cell types, mainly in germinal, embryonic, neoplastic and mitotic cells [ Wischnitzer, 1970], In seminiferous tubules they have been observed in human Sertoli cells [Bawa, 1963], invertebrate germ cells [Ruthmann, 1958;Hoage and Kessel, 1968;Pool and Hoage, 1975], fish spermatogonia [Schjeide et al, 1972], rat spermatids [Swift, 1956] and in human spermatocytes and spermatids [Smith and Berlin, 1977], Cytochemical analysis of AL revealed that the electrondense material between AL membranes cor responds to protein, while nucleic acids were not detected [Dhainaut, 1973;Smith and Berlin, 1977], Although different hypotheses upon the origin of the AL have been suggested [De Brahander and Borgers, 1975], Smith and Berlin [1977] assume that the origin of AL in human spermatogenesis is the nuclear envelope. This hypothesis is based on the connections observed between both types of membrane and has been pointed out previ ously for the AL of other cells [Kessel, 1964[Kessel, , 1968, In human spermatids, Horstmann [1961] described 'cytoplasmic lamellar bodies', considering them as a pathway for nuclear material to enter the cytoplasm.…”

Section: Discussionmentioning

confidence: 99%

Development of the endoplasmic reticulam during human spermatogenesis

Nistal¹,

Paniagua²,

Esponda³

1980

Cells Tissues Organs

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Development of the endoplasmic reticulam during human spermatogenesis

Nistal¹,

Paniagua²,

Esponda³

1980

Cells Tissues Organs

View full text Add to dashboard Cite

“…In the seminiferous tubules they have been observed in invertebrate germ cells [6,14,151, fish spermatogonia 1171, rat spermatids [20,221, human spermatocytes and spermatids [I 1, 191, and human Sertoli cells [l] . The present report provides ultrastructural evidence on AL formation from the rough endoplasmic reticulum (RER) in pubertal human Sertoli cells.…”

Section: Introductionmentioning

confidence: 99%

The Formation of Annulate Lamellae in the Human Sertoli Cell

Paniagua

Nistal

Bravo

1984

Archives of Andrology

View full text Add to dashboard Cite

The formation of annulate lamellae (AL) has been studied in human Sertoli cells. Sertoli cells of infants did not show AL. Sertoli cells of 9-to 1 1-year-old boys showed incompletely circumferentially arranged cisternae of endoplasmic reticulum (ER), alternating with rows of vesicles, 200-300 nm in diameter, with a weakly osmiophilic content. The ER cisternae displayed both pores and attached ribosomes at a few sites. These membranous structures were also observed beside true concentrically arranged AL in pubertal Sertoli cells (11-13 years of age). Both types of membranous formations were continuous with parallel, rough endoplasmic reticulum cisternae (RER) that interconnected them. Adult Sertoli cells showed only AL, not the other peculiar membranous formation. These features suggest that the RER plus associated vesicles originate the AL in human Sertoli cells.

show abstract

Cytology of neurons of the hypothalamic ventromedial nucleus in the adult male rat

Houten

Brawer

1978

J of Comparative Neurology

View full text Add to dashboard Cite

Recent evidence suggests that the hypothalamic ventromedial nucleus contains a wide variety of functionally specialized neurons, some of which are located within discrete regions of the nucleus. However, regional morphologic variations in neuronal populations within the HVM have not been demonstrated. In the present report, the neurons of the HVM were studied in young adult, male rats with the electron microscope. The collection and analysis of cytologic data were systematized with reference to location on a histologic map of the HVM, which was prepared prior to fine structural study.Neurons of the HVM were observed to exhibit regional variations in cytology. For example, cisternae of the rough endoplasmic reticulum in the anterior and dorsomedial regions of the nucleus are commonly collected into regular stacks typical of Nissl bodies. In contrast, rough cisternae in the posterior ventrolateral region of the HVM are often extremely long and pleomorphic, and form broad, loosely organized Nissl zones, in which occur myelin figures and wide varieties of cytoplasmic filamentous bodies.Other neurons located principally in the ventrolateral and posterior regions of the nucleus are characterized by the presence of whorled bodies. Still others restricted to the lateral rim of the nucleus are conspicuous by virtue of their enormous size and massive accumulation of Nissl material.One extremely unusual variety of HVM neuron is distinguished by the presence of large, acristic mitochondria, polysomal disaggregation, and aberrant nucleolar morphology. These cytologic features may indicate metabolic quiescence and perhaps anaerobiosis.Possibly these region-centered variations in neuronal cytology reflect the functional parcellation of the HVM. HVM participates in these diverse activities, however, is largely unknown.Some current theories propose that at least some HVM functions are mediated by functionally specialized cell types located in discrete areas of the nucleus. For example, there is evidence indicating that the HVM contains hypophysiotropic hormones, such as LHRH (Palkovits et al., '74 To date, the existence of specific populations of morphologically specialized neurons within the HVM has not been demonstrated. Previous anatomical studies of the HVM (Krieg, '32; Kaelber and Leeson, '67; Kovac and Denk, '68; Szentagothai e t al., '68; Millhouse, '73a; Takeichi and Noda, '74) have generally indicated a high degree of homogeneity among HVM neurons, which is somewhat surprising in view of the proposed diversity of functionally distinct cell types that are hypothesized to reside in this nucleus. The fact that Golgi-impregnated material did not reveal significant variation among HVM neurons may be attributed to the possibility that the morphologic features revealed by this method may not reflect the functional specializations of the HVM cell populations. Inasmuch a s many of the hypothesized functions of HVM neurons, such as glucoreception or neurosecretion, involve metabolic specializations, the morphologic paramet...

show abstract

Intranuclear and cytoplasmic annulate lamellae in grasshopper spermatocytes (Genus Melanoplus)

Cited by 10 publications

References 20 publications

Development of the endoplasmic reticulam during human spermatogenesis

Development of the endoplasmic reticulam during human spermatogenesis

The Formation of Annulate Lamellae in the Human Sertoli Cell

Cytology of neurons of the hypothalamic ventromedial nucleus in the adult male rat

Contact Info

Product

Resources

About