RESUMO
Topical supply of methoprene, a juvenile hormone analogue (JHa) caused notable morphological disturbance in insects. Topical supply of methoprene to newly emerged adult female D. cingulatus caused notable disturbance and induced a dramatic reduction in the total haemolymph protein pattern and lipophorin production in tissues like fat body, ovary and haemolymph. Total protein concentration in haemolymph also showed significant reduction in 1 day old insects but increased slightly as age advanced. Application of 20-hydroxyecdysone (20-HE) to 2-day-old adult female stimulated protein synthesis intensively. Lipophorin levels in fat body and ovary also simultaneously increased. Densitometric analysis revealed that methoprene inhibits while 20-HE stimulates lipophorin production in D. cingulatus.
Assuntos
Fatores Etários , Envelhecimento/fisiologia , Animais , Proteínas Sanguíneas/metabolismo , Ecdisterona/análogos & derivados , Eletroforese em Gel de Poliacrilamida , Feminino , Hemolinfa/efeitos dos fármacos , Insetos/efeitos dos fármacos , Hormônios Juvenis/fisiologia , Lipoproteínas/biossíntese , Metoprene/farmacologiaRESUMO
The effect of administration of cortisol, corticosterone, testosterone, progesterone and a synthetic estrogen, diethylstilbestrol on plasma proteins of tilapia (Oreochromis mossambicus) was investigated. SDS-PAGE clearly revealed the appearance of several new bands of protein, which were not present in the control plasma and were comparable to the known bands of the molecular markers. Of the different bands appeared in the steroids treated plasma, the most important ones were the presumed vitellogenin and corticotrophin binding globulin with a molecular weight of 180 and 17 kDa, respectively. Increase in protein bands in the steroid treated plasma of O. mossambicus confirmed the anabolic role of steroids in teleost.