* Activin-A promotes the development of goat isolated secondary follicles in vitro.
- The role of activin-A in follicular development and on the mRNA expression levels of different genes in goat secondary follicles was evaluated. Goat secondary follicles (≥ 150 μm) were cultured for 18 days under control conditions or with the addition of either 50 or 100 ng/ml activin-A (Experiment 1). The mRNA levels for the genes that code for activin-A, ActR-IA, ActR-IB, ActR-IIA, ActR-IIB, follicle stimulating hormone receptor (FSH-R) and P450 aromatase were measured in each condition (Experiment 2). We observed that after 6 days of culture, the antrum formation rate was higher in cultures with added activin-A than in the cultured control (P < 0.05). The addition of 50 ng/ml activin-A increased the follicular growth rate in the final third of the culture (days 12-18), resulting in a higher percentage of meiosis resumption (P < 0.05). On day 6, the addition of activin-A (50 ng/ml) increased the levels of ActR-IA mRNA compared with the cultured control (P < 0.05). After 18 days, the addition of 50 ng/ml activin-A significantly increased the levels of its own mRNA compared with the non-cultured control. Moreover, this treatment reduced the mRNA levels of P450 aromatase in comparison with the cultured control (P < 0.05). Higher levels of P450 aromatase mRNA were found for both activin-A treatments compared with the non-cultured control (P < 0.05). No difference in estradiol levels was detected among any of the tested treatments. In conclusion, the addition of activin-A to culture medium stimulated early antrum formation as well as an increase in the daily follicular growth rate and the percentage of meiosis resumption.
=>発達, 開発, 産物, 進展
Overview of noun development
The noun development has 9 senses (first 7 from tagged texts)
1. (52) development -- (act of improving by expanding or enlarging or refining; "he congratulated
them on their development of a plan to meet the emergency"; "they funded research and development")
2. (46) development, evolution -- (a process in which something passes by degrees to a different
stage (especially a more advanced or mature stage); "the development of his ideas took many years";
"the evolution of Greek civilization"; "the slow development of her skill as a writer")
3. (11) growth, growing, maturation, development, ontogeny, ontogenesis -- ((biology) the process of
an individual organism growing organically; a purely biological unfolding of events involved in an
organism changing gradually from a simple to a more complex level; "he proposed an indicator of
osseous development in children")
4. (9) development -- (a recent event that has some relevance for the present situation; "recent
developments in Iraq"; "what a revolting development!")
5. (7) exploitation, development -- (the act of making some area of land or water more profitable or
productive or useful; "the development of Alaskan resources"; "the exploitation of copper deposits")
6. (6) development -- (a district that has been developed to serve some purpose; "such land is
practical for small park developments")
7. (4) development -- (a state in which things are improving; the result of developing (as in the
early part of a game of chess); "after he saw the latest development he changed his mind and became
a supporter"; "in chess your should take care of your development before moving your queen")
8. development, developing -- (processing a photosensitive material in order to make an image
visible; "the development and printing of his pictures took only two hours")
9. development -- ((music) the section of a composition or movement (especially in sonata form)
where the major musical themes are developed and elaborated)
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