Gonadotropin stimuli increase adrenodoxin immunoreactivity in the mitochondria of rat ovarian cells.
Adrenodoxin is a component of the electron transfer system for mitochondrial cytochrome P450 in steroidogenic cells. To elucidate whether the steroidogenic state can modulate the amount and the distribution of adrenodoxin in the mitochondria, we determined immunohistochemically the distribution of adrenodoxin and 3beta-hydroxysteroid dehydrogenase (3betaHSD) in ovaries of rats under hypo- and hyperfunctional states. In the ovaries of control rats, adrenodoxin was distributed in the cristae of round-shaped mitochondria of both interstitial and theca cells. In hypophysectomized rats, no adrenodoxin was found in the mitochondria of atrophied cells. Treatment of hypophysectomized rats with human chorionic gonadotropin (hCG) or Humegon restored immunostaining of adrenodoxin in the interstitial and theca cells, and rendered the vesicular cristae of C- or ring-shaped mitochondria surrounding the lipid droplets adrenodoxin-positive. The distribution of 3betaHSD activity detected by enzyme histochemistry in these ovaries matched well that of adrenodoxin immunostaining. Our results indicate that immunostaining intensity of adrenodoxin in the mitochondria reflects the steroidogenic state in rat ovarian cells.
Izumi
Shin-Ichi
S
Division of Oral Cytology and Cell Biology, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1, Sakamoto, Nagasaki 852-8588, Japan. s-izumi@net.nagasaki-u.ac.jp
Mitani
Fumiko
F
D015096:3-Hydroxysteroid Dehydrogenases / Q000378:metabolism*; D000325:Adrenodoxin / Q000378:metabolism*; D000818:Animals; D006063:Chorionic Gonadotropin / Q000494:pharmacology*; D005260:Female; D006801:Humans; D007016:Hypophysectomy; D007150:Immunohistochemistry; D008596:Menotropins / Q000494:pharmacology; D018613:Microscopy, Confocal / Q000379:methods; D008854:Microscopy, Electron / Q000379:methods; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D010053:Ovary / Q000166:cytology* / Q000187:drug effects / Q000201:enzymology; D051381:Rats; D017208:Rats, Wistar
D006063:Chorionic Gonadotropin; D000325:Adrenodoxin; D008596:Menotropins; D015096:3-Hydroxysteroid Dehydrogenases