Abstract
OBJECTIVE: To compare direct intra-amniotic injection of betamethasone and thyroxine (T4) with maternal treatment and controls for accelerating pulmonary surfactant production. METHODS: Twelve pregnant monkeys (Macaca mulatta) on gestational day 125 (term 165 ± 10 days) had surfactant protein A and B concentrations measured in amniotic fluid. In four controls, normal saline was injected into the amniotic fluid; four others (intra-amniotic) received intra-amniotic betamethasone (1 mg) and T4 (60 μg); and in four others (maternal), the dam was given betamethasone (12 mg) intramuscularly, repeated in 24 hours, plus TRH (400 μg) intravenously, repeated every 6 hours for 24 hours. Seventy-two hours after the initial amniocentesis, a hysterotomy was performed and fetal tissue and amniotic fluid harvested for determination of surfactant protein A and B concentrations and immunohistochemical staining for surfactant protein A. RESULTS: Amniotic fluid surfactant protein A was higher with intra-amniotic injection than with maternal treatment (P < .04) or controls (P = .07). Amniotic fluid surfactant protein B was higher in the intra-amniotic group than in controls (P = .06). Immunohistochemical staining for surfactant protein A in the lung tissue was increased in the intra-amniotic group compared with controls (0.145 ± 0.01 versus 0.097 ± 0.001, percent positive staining for surfactant protein A cells per lung tissue cells; P < .03). Birth weight was greater in the intra-amniotic group compared with the maternal group (P < .03) although not different from the controls. Finally, gut motility and the presence of formed meconium were increased in the intra-amniotic group compared with the other groups (P < .05). CONCLUSION: Intra-amniotic injection of betamethasone and T4 enhanced lung (and possibly intestinal) maturation of the preterm rhesus fetal monkey compared with maternal injections.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 466-470 |
| Number of pages | 5 |
| Journal | Obstetrics and Gynecology |
| Volume | 98 |
| Issue number | 3 |
| DOIs | |
| State | Published - 2001 |
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ASJC Scopus subject areas
- Obstetrics and Gynecology
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Fetal monkey surfactants after intra-amniotic or maternal administration of betamethasone and thyroid hormone. / Gilbert, William M.; Eby-Wilkens, Elaine; Plopper, Charles; Whitsett, Jeffery A.; Tarantal, Alice F.
In: Obstetrics and Gynecology, Vol. 98, No. 3, 2001, p. 466-470.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Fetal monkey surfactants after intra-amniotic or maternal administration of betamethasone and thyroid hormone
AU - Gilbert, William M.
AU - Eby-Wilkens, Elaine
AU - Plopper, Charles
AU - Whitsett, Jeffery A.
AU - Tarantal, Alice F
PY - 2001
Y1 - 2001
N2 - OBJECTIVE: To compare direct intra-amniotic injection of betamethasone and thyroxine (T4) with maternal treatment and controls for accelerating pulmonary surfactant production. METHODS: Twelve pregnant monkeys (Macaca mulatta) on gestational day 125 (term 165 ± 10 days) had surfactant protein A and B concentrations measured in amniotic fluid. In four controls, normal saline was injected into the amniotic fluid; four others (intra-amniotic) received intra-amniotic betamethasone (1 mg) and T4 (60 μg); and in four others (maternal), the dam was given betamethasone (12 mg) intramuscularly, repeated in 24 hours, plus TRH (400 μg) intravenously, repeated every 6 hours for 24 hours. Seventy-two hours after the initial amniocentesis, a hysterotomy was performed and fetal tissue and amniotic fluid harvested for determination of surfactant protein A and B concentrations and immunohistochemical staining for surfactant protein A. RESULTS: Amniotic fluid surfactant protein A was higher with intra-amniotic injection than with maternal treatment (P < .04) or controls (P = .07). Amniotic fluid surfactant protein B was higher in the intra-amniotic group than in controls (P = .06). Immunohistochemical staining for surfactant protein A in the lung tissue was increased in the intra-amniotic group compared with controls (0.145 ± 0.01 versus 0.097 ± 0.001, percent positive staining for surfactant protein A cells per lung tissue cells; P < .03). Birth weight was greater in the intra-amniotic group compared with the maternal group (P < .03) although not different from the controls. Finally, gut motility and the presence of formed meconium were increased in the intra-amniotic group compared with the other groups (P < .05). CONCLUSION: Intra-amniotic injection of betamethasone and T4 enhanced lung (and possibly intestinal) maturation of the preterm rhesus fetal monkey compared with maternal injections.
AB - OBJECTIVE: To compare direct intra-amniotic injection of betamethasone and thyroxine (T4) with maternal treatment and controls for accelerating pulmonary surfactant production. METHODS: Twelve pregnant monkeys (Macaca mulatta) on gestational day 125 (term 165 ± 10 days) had surfactant protein A and B concentrations measured in amniotic fluid. In four controls, normal saline was injected into the amniotic fluid; four others (intra-amniotic) received intra-amniotic betamethasone (1 mg) and T4 (60 μg); and in four others (maternal), the dam was given betamethasone (12 mg) intramuscularly, repeated in 24 hours, plus TRH (400 μg) intravenously, repeated every 6 hours for 24 hours. Seventy-two hours after the initial amniocentesis, a hysterotomy was performed and fetal tissue and amniotic fluid harvested for determination of surfactant protein A and B concentrations and immunohistochemical staining for surfactant protein A. RESULTS: Amniotic fluid surfactant protein A was higher with intra-amniotic injection than with maternal treatment (P < .04) or controls (P = .07). Amniotic fluid surfactant protein B was higher in the intra-amniotic group than in controls (P = .06). Immunohistochemical staining for surfactant protein A in the lung tissue was increased in the intra-amniotic group compared with controls (0.145 ± 0.01 versus 0.097 ± 0.001, percent positive staining for surfactant protein A cells per lung tissue cells; P < .03). Birth weight was greater in the intra-amniotic group compared with the maternal group (P < .03) although not different from the controls. Finally, gut motility and the presence of formed meconium were increased in the intra-amniotic group compared with the other groups (P < .05). CONCLUSION: Intra-amniotic injection of betamethasone and T4 enhanced lung (and possibly intestinal) maturation of the preterm rhesus fetal monkey compared with maternal injections.
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UR - http://www.scopus.com/inward/citedby.url?scp=0034836246&partnerID=8YFLogxK
U2 - 10.1016/S0029-7844(01)01417-X
DO - 10.1016/S0029-7844(01)01417-X
M3 - Article
C2 - 11530131
AN - SCOPUS:0034836246
VL - 98
SP - 466
EP - 470
JO - Obstetrics and Gynecology
JF - Obstetrics and Gynecology
SN - 0029-7844
IS - 3
ER -