Tinctorial Differentiation of the Cell Types in the Pars Anterior of the Sheep

Tassell, Robin; Kennedy, J. F.

doi:10.1071/bi9721249

Cited by 7 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The distribution of GH cells observed in lactating and weaning ewes was similar to that observed in anoestrus, with a predominance in the dorsocaudal regions of the hypophysis, as described by Tassell & Kennedy (1972), Ortman (1987) and Bernabé et al . 1995–96 ) .…”

Section: Discussionsupporting

confidence: 82%

Light and ultrastructural immunocytochemical study of somatotropic cells (GH cells) in ovine adenohypophysis: lactation and weaning influences

Bernabé¹,

Gómez²,

Seva³

et al. 2000

Anat Histol Embryol

View full text Add to dashboard Cite

The influence of lactation period and weaning on the distribution, number, and structure of somatotropic cells (GH cells) in ewes was studied using immunocytochemical procedures for light and electron microscopy, as well as morphometric and stereological techniques. The adenohypophyseal gland of 12 ewes of the Segureña breed in different stages of milk production and weaning was studied, while three ewes in anoestrus served as controls. The size of secretory granules was heterogeneous in all stages, suggesting that this characteristic is not related to functional activity. During lactation and weaning the size of GH cells decreased, while the number of 'synthesis cells' increased. The rough endoplasmic reticulum and Golgi complex appeared more developed and small secretory granules showed lower gold particle labelling. These data suggest that GH cells are more active during lactation, particularly during late lactation.

show abstract

Section: Discussionsupporting

confidence: 82%

Light and ultrastructural immunocytochemical study of somatotropic cells (GH cells) in ovine adenohypophysis: lactation and weaning influences

Bernabé¹,

Gómez²,

Seva³

et al. 2000

Anat Histol Embryol

View full text Add to dashboard Cite

show abstract

“…Similar results were reported by Smith and Farquhar [1966], and Vila-Porcile et al [1988]. The variation of granule size during lactation agrees with the postulated process of PRL synthesis and release, and has also been reported by Tassell and Kennedy [1972] in sheep and Navarro [1987] in goats. However, Sá nchez et al [1992] found no such variation in goats.…”

Section: Discussionsupporting

confidence: 80%

Light and Ultrastructural Immunocytochemical Study of Prolactin Cells in Ovine Adenohypophysis

Bernabé

Gómez²,

Seva³

et al. 2001

Cells Tissues Organs

View full text Add to dashboard Cite

The influence of lactation and weaning on the number, distribution, and structure of mammotroph cells (PRL cells) in ewes was studied using immunocytochemical procedures for light and electron microscopy, as well as morphometric and stereological techniques. The adenohypophyseal gland of 12 ewes of the Segureña breed at different stages of milk production and weaning were analysed, while the same organ of 3 ewes in anestrus served as control. During lactation, PRL cells increased in number and decreased in size. Ultrastructurally, these cells showed a well-developed rough endoplasmic reticulum (RER) and Golgi complex (GC), and large secretory granules. These findings point to increased synthesis and secretion activities during lactation, and a decrease after weaning. One day after weaning ‘storage’ cells increased in number, and crinophagy became evident 7 days after weaning, when the first ‘inactive’ cells were seen (10% of total cells). In anestrus these last cells represented 40% of the total, and showed scarce granules, signs of inactivity, lysosomes and lipid droplets.

show abstract

“…Bugnon and Garnet (1969) described the initial occurrence of prolactin cells in 20 week old human fetuses, and also observed hypertrophy of these cells from 32 weeks to the time of birth. Presence of fetal prolactin has also been reported in sheep (Stokes andBoda 1968, Tassel1 andKennedy 1972), in mouse (Kohmoto and Bern 1971) and in rat (Setalo 1973). Although the present report does not offer any data on the presence of prolactin before birth, it is worth emphasizing that there is a wide gap between the latest prenatal stage and the neonatal stages employed in this study.…”

Section: Discussionmentioning

confidence: 79%

Cytodifferentiation in the Pars Distalis of the Pituitary Gland in the Fetal and Juvenile Mink,Mustela vison

Weman

1974

Acta Zoologica

View full text Add to dashboard Cite

Hypophysial tissue of mink (Mustela vison) embryos, newborn young and kits aged 1 day to 27 weeks was examined by light and electron microscopy. Among the embryos five different ontogenetic stages were distinguished. It appears that the primordium of the pituitary gland differentiates in early embryonic life. Several types of glandular cells containing variable amounts of granular material were recognizable by the time of birth. The role of the granular cells and the origin of the lumina in the pars distalis are speculated upon (in the Discussion).

show abstract

Tinctorial Differentiation of the Cell Types in the Pars Anterior of the Sheep

Cited by 7 publications

References 12 publications

Light and ultrastructural immunocytochemical study of somatotropic cells (GH cells) in ovine adenohypophysis: lactation and weaning influences

Light and ultrastructural immunocytochemical study of somatotropic cells (GH cells) in ovine adenohypophysis: lactation and weaning influences

Light and Ultrastructural Immunocytochemical Study of Prolactin Cells in Ovine Adenohypophysis

Cytodifferentiation in the Pars Distalis of the Pituitary Gland in the Fetal and Juvenile Mink,Mustela vison

Contact Info

Product

Resources

About