ATP depletion and cell death in the neonatal lamb ductus arteriosus.
Postnatal constriction of the full-term ductus arteriosus produces cell death and remodeling of the ductus wall. Using a bioluminescence imaging technique, we found that after birth, the lamb ductus develops ATP, glucose, and glycogen depletion in addition to hypoxia. In vitro studies showed that cell death correlates best with ATP depletion and is most marked when both glucose and oxygen are severely depleted; in addition, the degree of ATP depletion found in vivo is sufficient to account for the extensive degree of cell death that occurs after birth. Under hypoxic conditions, the immature ductus is more capable of preserving its ATP supply than the mature ductus as a result of increased glucose availability, glycogen stores, and glucose utilization. However, the immature ductus is just as susceptible as the mature ductus to ATP depletion when glucose supplies are restricted. The extensive degree of cell death that occurs in the newborn ductus after birth is associated primarily with ATP depletion. The increased glycolytic capacity of the immature ductus may enable it to tolerate episodes of hypoxia and nutrient shortage, making it more resistant to developing postnatal cell death and permanent closure.
Levin
Max
M
Wallenberg Laboratory for Cardiovascular Research, Göteborg University, SE-413 45 Göteborg, Sweden.
Goldbarg
Seth
S
Lindqvist
Anders
A
Swärd
Karl
K
Roman
Christine
C
Liu
Bao Mei
BM
Hultén
Lillemor Mattsson
LM
Borén
Jan
J
Clyman
Ronald I
RI
D000255:Adenosine Triphosphate / Q000378:metabolism*; D000818:Animals; D000831:Animals, Newborn; D017209:Apoptosis; D004373:Ductus Arteriosus / Q000166:cytology* / Q000378:metabolism*; D005333:Fetus / Q000166:cytology / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D006019:Glycolysis; D007003:Hypoglycemia / Q000378:metabolism / Q000473:pathology; D000860:Hypoxia / Q000378:metabolism / Q000473:pathology; D066298:In Vitro Techniques; D012756:Sheep
D000255:Adenosine Triphosphate; D005947:Glucose