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Growth hormone responses to growth hormone releasing factor in neonates
Insights
Synthetic human growth hormone releasing factor (hGRF) effectively stimulates growth hormone (GH) release in neonates. No significant differences in GH response were observed across various neonatal subgroups based on age, gestational age, birth weight, or sex.
Area of Science:
- Neonatal endocrinology
- Pediatric growth disorders
Background:
- Growth hormone (GH) is crucial for neonatal development.
- Understanding GH regulation in neonates is vital for diagnosing and treating growth impairments.
Purpose of the Study:
- To assess the acute secretory response of GH to synthetic human growth hormone releasing factor (hGRF) in neonates.
- To investigate potential demographic or physiological factors influencing this response.
Main Methods:
- Intravenous administration of synthetic hGRF to 32 neonates (3-28 days old).
- Measurement of serum GH levels at baseline and at 30-minute intervals post-administration.
- Statistical comparison of GH response across subgroups (age, gestational age, birth weight, sex).
Main Results:
- GH levels peaked at 30 minutes after hGRF administration, reaching a mean of 66.4 +/- 6.2 ng/ml.
- No statistically significant differences in GH response were found when comparing neonates based on age (<7 vs. >8 days), gestational age (<37 vs. >38 weeks), birth weight (<2,500g vs. >2,501g), or sex.
Conclusions:
- Synthetic hGRF reliably stimulates GH release in neonates.
- The neonatal GH response to hGRF is consistent across a range of early developmental parameters, suggesting a robust and uniform hypothalamic-pituitary axis function in this age group.
Abstract:
The response of growth hormone (GH) to synthetic human growth hormone releasing factor (hGRF) administered intravenously was examined in 32 neonates aged 3-28 days. GH peaked at 30 min after hGRF administration and the mean +/- SEM level of GH at maximal response was 66.4 +/- 6.2 ng/ml. In the comparison between the neonates less than 7 days old and those more than 8 days old, between the neonates less than 37 weeks and those more than 38 weeks in gestational age, between the neonates under 2,500 g and those over 2,501 g in birth body weight, and between males and females, no significant statistical differences were observed.