Related Experiment Videos
Remarkable changes in the plasma levels of pituitary protein "7B2" during childhood
1Department of Biochemistry, National Kyushu Cancer Center, Fukuoka, Japan.
Insights
Plasma immunoreactive (IR)-7B2 levels are significantly higher in infants and decrease with age, correlating with hormonal changes during childhood development.
Area of Science:
- Endocrinology
- Pediatric Endocrinology
- Neuroendocrinology
Background:
- The neuropeptide 7B2 plays a crucial role in neuroendocrine regulation.
- Understanding the developmental trajectory of 7B2 is essential for interpreting its physiological functions.
- Previous studies have not comprehensively characterized plasma IR-7B2 concentrations across childhood and adolescence.
Purpose of the Study:
- To measure plasma immunoreactive (IR)-7B2 concentrations in a cohort of children from infancy to young adulthood.
- To investigate the relationship between plasma IR-7B2 levels and age, as well as key pubertal hormones.
Main Methods:
- Plasma samples were collected from 96 children (57 males, 39 females) aged from birth to 20 years.
- Plasma IR-7B2 concentrations were quantified using an immunoassay.
- Correlations between IR-7B2 levels and dehydroepiandrosterone sulfate, luteinizing hormone, and follicle-stimulating hormone were analyzed.
Main Results:
- Infants (<2 years) exhibited significantly higher plasma IR-7B2 levels (175-580 pg/ml) compared to adults (20-138 pg/ml).
- Plasma IR-7B2 concentrations demonstrated a significant age-dependent decrease, reaching adult levels by 15-20 years.
- Negative correlations were observed between plasma IR-7B2 and dehydroepiandrosterone sulfate (r = -0.4154), luteinizing hormone (r = -0.4948), and follicle-stimulating hormone (r = -0.4682).
Conclusions:
- Plasma IR-7B2 levels undergo substantial changes during childhood and adolescence.
- The observed inverse correlation suggests a potential link between decreasing IR-7B2 levels and pubertal development.
- Further research is warranted to elucidate the precise role of 7B2 in the neuroendocrine regulation of puberty.
Abstract:
We measured plasma immunoreactive (IR)-7B2 concentrations in 96 children (57 males and 39 females) from the newborn period to 20 yr of age. Plasma IR-7B2 concentrations in infants less than 2 yr of age (range 175-580 pg/ml, n = 19) were much higher than those in adults (range 20-138 pg/ml). Plasma levels of IR-7B2 decreased with age during childhood to reach the adult level at 15-20 yr. Significant negative correlations were found between plasma levels of IR-7B2 and dehydroepiandrosterone sulfate (r = -0.4154, p less than 0.05, n = 27), luteinizing hormone (r = -0.4948, p less than 0.05, n = 20) and follicle-stimulating hormone (r = -0.4682, p less than 0.05, n = 20). The possibility of a relationship between the reduction of plasma IR-7B2 levels and pubertal development warrants attention.