Regulation of melanization of tobacco hornworm larval cuticle in vitro.
Regulation of melanization of tobacco hornworm larval cuticle in vitro.
复制标题
烟草天蛾幼虫角质层黑化的体外调节。
DOI:
10.1002/jez.1402300308
复制
发表时间:
1984
期刊:
影响因子:
--
通讯作者:
Riddiford,LM
中科院分区:
文献类型:
--
作者:
Hiruma,K;Riddiford,LM
When tobacco hornworm larvae (Manduca sexta) are allatectomized 5–6 hr before head capsule slippage in the molt to the fifth (final) larval instar, the new cuticle melanizes 3 hr before ecdysis. After explantation between 7 and 3 hr before the onset of melanization, the new cuticle was found to melanize in vitro in Grace's medium only if β‐alanine was removed. When explanted at the onset of melanization, the presence of β‐alanine had no effect on melanization. The addition of either dopa or dopamine was found to be necessary for complete melanization of pieces explanted before the onset of melanization with 0.3 mM of either dopa or dopamine being optimal. Both of these compounds were incorporated into the cuticular melanin. In this optimal medium, melanization occurred over about a 9‐hr period after a 5‐ to 6‐hr lag period presumably required for adjustment to the medium. Fifty ng/ml 20hydroxyecdysone was found to inhibit melanization of pieces explanted 7 hr but not 3 hr before melanization. The hormone neither inhibited uptake of dopa into the epidermis nor prevented melanization in the cuticle once the prophenoloxidase in the premelanin granules was activated. Therefore, 20hydroxyecdysone may inhibit the activation of the phenoloxidase in the premelanin granules, or may inhibit the incorporation of dopa into the granules.
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影响因子:
2.2
作者:
R. H. Ross;R. Monroe
通讯作者:
R. Monroe
影响因子:
2.7
作者:
K. Hiruma
通讯作者:
K. Hiruma
DOI:
--
发表时间:
1973
期刊:
影响因子:
--
作者:
J. Truman;L. Riddiford;L. Safranek
通讯作者:
L. Safranek
DOI:
--
发表时间:
1972
期刊:
影响因子:
--
作者:
J. Truman
通讯作者:
J. Truman
DOI:
--
发表时间:
1975
期刊:
The Biological Bulletin
影响因子:
--
作者:
M. J. Fain;L. Riddiford
通讯作者:
L. Riddiford