Plasma steroids in the ammocoete of Petromyzon marinus.
Radioimmunoassays revealed the presence of the following steroids (or immunoreactive steroid fractions) in the plasma of larval sea lampreys: progesterone, corticosterone, cortisol, androstenedione, testosterone, dihydrotestosterone, estrone, and estradiol. Several types of stress served to provoke the release of these substances. A statistically significant effect of the treatment was noted under only one condition: squeezing of the body of decapitated ammocoetes during blood collection caused an increase in plasma dihydrotestosterone and a decrease in plasma estradiol. The discovery of all eight steroids (or immunoreactivities) assayed for suggests that the plasma of the ammocoete may contain a considerable number of additional steroids yet to be identified.
D000735:Androstenedione / Q000097:blood; D000818:Animals; D003345:Corticosterone / Q000097:blood; D013196:Dihydrotestosterone / Q000097:blood; D004958:Estradiol / Q000097:blood; D004970:Estrone / Q000097:blood; D005399:Fishes / Q000097:blood*; D006854:Hydrocortisone / Q000097:blood; D007798:Lampreys / Q000097:blood*; D011374:Progesterone / Q000097:blood; D011863:Radioimmunoassay; D013256:Steroids / Q000097:blood*; D013312:Stress, Physiological / Q000097:blood; D013739:Testosterone / Q000097:blood; D013997:Time Factors
D013256:Steroids; D013196:Dihydrotestosterone; D004970:Estrone; D013739:Testosterone; D000735:Androstenedione; D011374:Progesterone; D004958:Estradiol; D003345:Corticosterone; D006854:Hydrocortisone