Key result
Male rat somatotropes form consistently larger plaques than females under basal and stimulated conditions.
Why the study?
Sexual differences in growth hormone release that develop at puberty in rats are not fully explained by differences in the number of GH-secreting cells, suggesting a need to investigate secretory capacities of individual somatotropes.
Population
Male and female rat pituitary donors at 10-30, 50, and 100 days of age
Comparison
Basal conditions versus GH-releasing factor treatment; male versus female somatotrope secretory capacity
Design
Reverse hemolytic plaque assay in 24-h pituitary cultures
Authors
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Hypothesis-generating in rats; should not yet inform sex-specific GH therapy or research in patients.
p-value: p=<0.01
Sexual differences in growth hormone release in rats are driven by the secretory capacity of individual somatotropes rather than the total number of GH-secreting cells.
Hoeffler et al. (1986) studied Sexual differences in growth hormone release. Male sex vs. Female sex was evaluated on Plaque areas (secretory capacities of individual somatotropes) under basal and stimulated conditions at day 100 (p=<0.01). By day 100, plaques formed by individual somatotropes under basal and stimulated conditions were consistently larger for male than for female rats (P<0.01).
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