Abstract
Antenatal steroids suppress growth in the fetus and newborn. Although weight deficits are regained by weaning, studies show that intrauterine growth restriction with postnatal “catch-up” growth is a risk factor for hypertension, insulin resistance, and ischemic heart disease in adult life, with multigenerational consequences. We tested the hypothesis that fetal exposure to betamethasone suppresses fetal growth in the F1 pups and their untreated F2 offspring. Timed pregnant rats received a single two-dose course of intramuscular betamethasone (0.25 mg/kg/day) on days 17 and 18 of gestation. Matched controls received equivalent volumes sterile normal saline. The first-generation (F1) offspring were studied at term, P21, and P70, or mated at P60 to produce the following subgroups: (1) saline male/saline female (SM/SF), (2) betamethasone (B) male/BFemale (BM/BF), (3) BM/SF, and (4) SM/BF. The unexposed second-generation (F2) offspring were examined at birth and P70. Growth, neurological outcomes, and growth factors were determined. At birth, the F1 pups exposed to B were significantly growth suppressed compared with the controls, with correspondingly lower blood glucose, insulin, IGF-I, corticosterone, and leptin levels and delayed neurological outcomes. Catchup growth occurred at P21, surpassing that of the control group. By P70, growth was comparable, but glucose was higher, insulin was lower, and memory was retarded in the B group, and transmitted to the unexposed F2 offspring of B-exposed rats. Antenatal betamethasone has sustained metabolic and neurological effects that may impact the unexposed offspring. Whether these intergenerational effects reverse in future generations remain to be determined.
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Abbreviations
- Sal:
-
saline
- SM/SF:
-
saline-treated male/saline-treated female
- BM/BF:
-
betamethasone-treated male/betamethasone-treated female
- BM/SF:
-
betamethasone-treated male/saline-treated female
- SM/BF:
-
saline-treated male/betamethasone-treated female
- P0:
-
day of birth
- P21:
-
21 days postnatal age
- P70:
-
70 days postnatal age
- RDS:
-
respiratory distress syndrome
- GCs:
-
glucocorticoids
- IM:
-
intramuscular
- SGA:
-
small for gestational age
- AGA:
-
appropriate for gestational age
- IGF:
-
insulin-like growth factor
- IGFR:
-
insulin-like growth factor receptor
- IGFBP:
-
insulin-like growth factor binding protein
- IUGR:
-
intrauterine growth restriction
- GH:
-
growth hormone
- F1:
-
first generation
- F2:
-
second generation
- ANOVA:
-
analysis of variance
- SEM:
-
standard error of the mean
- SPSS:
-
Statistical Package for the Social Sciences
- HPA:
-
hypothalamic-pituitary-adrenal
- 11β-HSD:
-
11β-hydroxysteroid dehydrogenase
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This work was supported by Memorial Health Services Research Foundation, Long Beach, CA, USA.
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All experiments were approved by the Institutional Animal Care and Use Committee, Long Beach Memorial Medical Center, Long Beach, CA. Animals were cared for according to the guidelines outlined by the Guide for the Care and Use of Laboratory Animals (National Research Council). Euthanasia of the animals was conducted according to the guidelines of the American Veterinary Medical Association (AVMA Panel).
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Abrantes, M.A., Valencia, A.M., Bany-Mohammed, F. et al. Intergenerational Influence of Antenatal Betamethasone on Growth, Growth Factors, and Neurological Outcomes in Rats. Reprod. Sci. 27, 418–431 (2020). https://doi.org/10.1007/s43032-019-00073-w
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DOI: https://doi.org/10.1007/s43032-019-00073-w