Some histological and histochemical observations of the bovine ovary during the estrous cycle

Taphozous melanopogon meianopogon is a unique emballonurid microchiropteran which exhibits a 100% dextral dominance of the female genital tract. Folliculogenesis occurs in the contralateral ovaries, but it is only in the right ovary that a single Graafian follicle attains maturity and ovulates.The product of fertilization is implanted in the dextral uterine cornu. Seven types of follicles were identified.in the right ovary, as compared with five in the left, on the basis of shape, size and number of associated granulosa cells. In the parous bats, a single, nearly extroverted corpus luteum was discerned in the ovary which survived for 2–2V2 months.The left ovary was nearly a vestigial structure during pregnancy. The structural asymmetry of the internal genitalia was observed to be correlated with the histochemical site and pattern of distribution of acid phosphatase and alkaline phosphatase. Differential activites of phosphatases were discerned in the developing primary, secondary, preantral and antral follicles and the interstitial tissues of the contralateral ovary during the nulliparous state. A high enzyme reaction was displayed by follicles undergoing atretic and degenerative changes. In the parous bats, pronounced differences were noted in the histologic constituents of the contralateral ovary. This study shows a significant link between functional asymmetry of the genitalia and the structural and enzymological characteristics of the ovarian tissues.

show abstract

“…Myoiis [Wimsatt. 1949] and in the sow [Moss et al. 1954] positive AlkPase activity was observed in the zona pellucida.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Histoenzymological Alterations in the Contralateral Ovary of Nulliparous and Parous Females of the Bat <i>Taphozous melanopogon melanopogon</i> Temmnick (Microchiroptera, Mammalia) Displaying Absolute Dextral Dominance of the Genital Tract

Jaroli

Lall

1987

Cells Tissues Organs

View full text Add to dashboard Cite

show abstract

“…This opinion was based on the fact that mitotic activity in granulosa-derived cells ceased early during CL formation, whereas small cells continued to divide (Moss et al 1954;Donaldson and Hansel 1965;.…”

Section: Characterization and Derivation Of Luteal Cell Typesmentioning

confidence: 99%

Control of Steroidogenesis in Small and Large Bovine Luteal. Cells

Hansel

Alila²,

Dowd³

et al. 1987

Aust. Jnl. Of Bio. Sci.

View full text Add to dashboard Cite

Evidence was cited to show that: (1) prostacyclin (PGI2) plays a luteotrophic role in the bovine corpus luteum and that products of the lipoxygenase pathway of arachidonic acid metabolism, especially 5-hydroxyeicosatetraenoic acid play luteolytic roles; (2) oxytocin of luteal cell origin plays a role in development, and possibly in regression, of the bovine corpus luteum; and (3) luteal cells arise from two sources; the characteristic small luteal cells at all stages of the o~strous cycle and pregnancy are of theca cell origin; the large cells are of granulosa cell origin early in the cycle, but a population of theca-derived large cells appears later in the cycle. Results of in vitro studies with total dispersed cells and essentially pure preparations of large and small luteal cells indicate that : (1) the recently described Ca 2 + -polyphosphoinositol-protein kinase C second messenger system is involved in progesterone synthesis in the bovine corpus luteum; (2) activation of protein kinase C is stimulatory to progesterone synthesis in the small luteal cells; (3) activation of protein kinase C has no effect on progesterone synthesis in the large luteal cells; and (4) protein kinase C exerts its luteotrophic effect in total cell preparations, in part at least, by stimulating the production of prostacyclin. The protein kinase C system may cause down regulation of LH receptors in the large cells.

show abstract

“…In domestic animals, it is thought that large luteal cells, which are presumably derived from the follicular granulosa, either do not proliferate or undergo minimal proliferation only at the beginning of the oestrous cycle (Moss et /.,1954;Priedkalns et ah, 1968;McClellan et ah, 1975;Jablonka-Shariff et ah, 1993;Zheng et ah, 1994). In contrast, small luteal cells and non-steroidogenic luteal cells, presumably derived from the follicular theca, appear to proliferate much more rapidly throughout the oestrous cycle and even into early pregnancy (Priedkalns et ah, 1968;McClellan et ah, 1975;JablonkaShariff et ah, 1993JablonkaShariff et ah, , 1997Zheng et ah, 1994;Reynolds et ah, 1994;Redmer and Reynolds, 1996;Reynolds andRedmer, 1998,1999).…”

Section: Introductionmentioning

confidence: 99%

Growth and cellular proliferation of pig corpora lutea throughout the oestrous cycle

Ricke

Redmer²,

Reynolds³

1999

Reproduction

View full text Add to dashboard Cite

show abstract

Some histological and histochemical observations of the bovine ovary during the estrous cycle

Cited by 43 publications

References 7 publications

Comparison of Histoenzymological Alterations in the Contralateral Ovary of Nulliparous and Parous Females of the Bat <i>Taphozous melanopogon melanopogon</i> Temmnick (Microchiroptera, Mammalia) Displaying Absolute Dextral Dominance of the Genital Tract

Comparison of Histoenzymological Alterations in the Contralateral Ovary of Nulliparous and Parous Females of the Bat <i>Taphozous melanopogon melanopogon</i> Temmnick (Microchiroptera, Mammalia) Displaying Absolute Dextral Dominance of the Genital Tract

Control of Steroidogenesis in Small and Large Bovine Luteal. Cells

Growth and cellular proliferation of pig corpora lutea throughout the oestrous cycle

Contact Info

Product

Resources

About