Single-cell transcriptomic analysis reveals rich pituitary-Immune interactions under systemic inflammation

Area of Science:

• Endocrinology
• Immunology
• Molecular Biology

Background:

• The pituitary gland is a key component of the hypothalamus-pituitary-adrenal (HPA) axis.
• Pituitary hormone-producing cells (HPCs) regulate bodily functions and modulate the immune system via adrenocorticotropic hormone (ACTH).

Purpose of the Study:

• To investigate how systemic inflammation affects the transcriptomic profiles of pituitary HPCs.
• To understand the cell type-specific responses of the pituitary to inflammation.

Main Methods:

• Single-cell RNA sequencing (scRNA-seq) was performed on mouse pituitary tissue.
• Analysis of transcriptomic changes in HPCs under inflammatory conditions.

Main Results:

• All major pituitary HPCs exhibited robust, cell type-specific transcriptomic responses to inflammation.
• Corticotropes showed the most significant reaction to systemic inflammation.
• Inflammation induced the release of noncanonical molecules like Nptx2 and up-regulated chemokine gene expression in HPCs, facilitating immune cell communication.

Conclusions:

• The pituitary gland plays a multifaceted role in mediating inflammatory effects on physiology.
• Extensive interactions between the pituitary and immune system were revealed.
• Pituitary HPCs actively communicate with immune cells during inflammation.