TY - JOUR
T1 - Enhancement of adrenomedullary catecholamine release by adrenal cortex in fetus
AU - Cheung, C. Y.
PY - 1984
Y1 - 1984
N2 - Catecholamine (CA) release from ovine fetal adrenomedullary cells was greatly enhanced by coincubation with adrenocortical cells. Total CA release was significantly elevated at 2 and 6 h of preincubation by 7- and 2-fold, respectively. With continuous coincubation of the two cell types, the enhancement of release was found to occur as early as 30 min and maintained for at least 6 h. A similar enhancement effect was observed when adrenomedullary cells were incubated in adrenocortical cell incubation medium (ACM). The stimulation of release was demonstrated for each of the three CA: dopamine, norepinephrine, and epinephrine. The effect of adrenocortical cells differed from that of adrenal steroids, because cortisol selectively stimulated the release of epienphrine only by 1- to 3-fold after a latency of 6 to 9 h, whereas dehydroepiandrosterone had no effect on the release of the three CA at any time tested. Finally, the CA stimulatory activity in ACM was acid and heat stable, not extractable by ether but inactivated by proteolytic digestion. These results suggest that the adrenal cortex of the near-term ovine fetus secretes a factor that stimulates the release and perhaps synthesis of CA from the adrenal medulla.
AB - Catecholamine (CA) release from ovine fetal adrenomedullary cells was greatly enhanced by coincubation with adrenocortical cells. Total CA release was significantly elevated at 2 and 6 h of preincubation by 7- and 2-fold, respectively. With continuous coincubation of the two cell types, the enhancement of release was found to occur as early as 30 min and maintained for at least 6 h. A similar enhancement effect was observed when adrenomedullary cells were incubated in adrenocortical cell incubation medium (ACM). The stimulation of release was demonstrated for each of the three CA: dopamine, norepinephrine, and epinephrine. The effect of adrenocortical cells differed from that of adrenal steroids, because cortisol selectively stimulated the release of epienphrine only by 1- to 3-fold after a latency of 6 to 9 h, whereas dehydroepiandrosterone had no effect on the release of the three CA at any time tested. Finally, the CA stimulatory activity in ACM was acid and heat stable, not extractable by ether but inactivated by proteolytic digestion. These results suggest that the adrenal cortex of the near-term ovine fetus secretes a factor that stimulates the release and perhaps synthesis of CA from the adrenal medulla.
UR - http://www.scopus.com/inward/record.url?scp=0021703288&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0021703288&partnerID=8YFLogxK
U2 - 10.1152/ajpendo.1984.247.5.e693
DO - 10.1152/ajpendo.1984.247.5.e693
M3 - Article
C2 - 6496735
AN - SCOPUS:0021703288
SN - 0193-1849
VL - 10
SP - E693-E697
JO - American Journal of Physiology - Endocrinology and Metabolism
JF - American Journal of Physiology - Endocrinology and Metabolism
IS - 5
ER -