The effect of temporary hypoxia on prostaglandin synthesis in mouse brain cell cultures during development.
Cultures of dissociated brain cells of new born mice represent a model for the study of brain development. One and two weeks old, they correspond in regard to oligodendrocyte differentiation to about the developmental stage of a human newborn and a six months old infant respectively. Such cultures were used to establish the developmental prostaglandin pattern and to study early and late recovery of prostaglandin synthesis from temporary hypoxia. Basal and bradykinin stimulated prostaglandin release were examined. Most prominently in stimulated release, the developmental prostaglandin pattern at one week showed a prevalence of PGE2 (33 +/- 4%) over PGD2 (12 +/- 5%), which in two weeks old cultures changes to an opposite distribution (PGE2 10 +/- 4%; PGD2 25 +/- 6%). This change goes parallel with the number and differentiation of oligodendrocytes. During the first day post hypoxia, imposed at the end of one week, the production of 6 oxo PGF1 alpha, PGE2, PGD2 and TXB2 was significantly decreased in two study series and increased compared to control in another. Since the arachidonic acid uptake was the same in all three series, this differential observation indicates differential early recovery. 8 days post hypoxia (late recovery), PG release was not different from control, indicating complete recovery at that time. During early recovery from hypoxia on 14 days old cultures, basal PG release was not significantly different from control, however bradykinin stimulated release was significantly inhibited in all three series. This may indicate that mainly regulatory influences on PG release in older cultures are compromised by hypoxia.(ABSTRACT TRUNCATED AT 250 WORDS)
Kaeser
F
F
Division of Pediatric Nephrology, University Children's Hospital, Berne, Switzerland.
Lüthy
C
C
Herschkowitz
N
N
Oetliker
O
O
D000818:Animals; D001920:Bradykinin / Q000378:metabolism; D001921:Brain / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism; D002478:Cells, Cultured; D005260:Female; D000860:Hypoxia / Q000378:metabolism*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D011453:Prostaglandins / Q000096:biosynthesis*
D011453:Prostaglandins; D001920:Bradykinin