Disruptions in Hypothalamic-Pituitary-Gonadal Axis Development and Their IgG Modulation after Prenatal Systemic...

Area of Science:

• Neuroendocrinology
• Developmental Biology
• Immunology

Background:

• The developing neuroendocrine system is vulnerable to environmental factors.
• Maternal infection can negatively impact fetal development.
• The hypothalamic-pituitary-gonadal (HPG) axis is crucial for reproductive function.

Purpose of the Study:

• To investigate the effects of maternal systemic inflammation on HPG axis development in male rat offspring.
• To determine if IL-6 signaling mediates these inflammatory effects.
• To evaluate the protective role of anti-inflammatory treatments.

Main Methods:

• Induction of systemic inflammation using lipopolysaccharides (LPS) in pregnant rats at specific embryonic days (ED12 and ED18).
• Assessment of HPG axis development in adult male offspring, including neuronal connectivity and hormone levels.
• Administration of polyclonal IgG and anti-interleukin-6 receptor antibodies (IL-6RmAbs) to block inflammatory effects.
• Histological examination of gonadal structures.

Main Results:

• LPS exposure on ED12, but not ED18, reduced synaptic inputs to gonadotropin-releasing hormone neurons in adult male offspring.
• ED12 LPS exposure led to decreased follicle-stimulating hormone and sex steroid levels, and disrupted gonadal structure.
• Prenatal blockade of IL-6 receptors with IL-6RmAbs and polyclonal IgG mitigated the adverse effects of LPS on HPG axis development.

Conclusions:

• Prenatal exposure to systemic inflammation can cause lasting disruptions in the development of the male HPG axis.
• Interleukin-6 (IL-6) signaling plays a significant role in mediating the detrimental effects of inflammation on fetal neuroendocrine development.
• Anti-inflammatory interventions targeting IL-6 signaling can protect against developmental deficits in the HPG axis.