β-hydroxybutyrate: much more than a metabolite

Area of Science:

• Biochemistry
• Molecular Biology
• Metabolic Disease Research

Background:

• Ketone body beta-hydroxybutyrate (βOHB) serves as an energy carrier during fasting and exercise.
• Beyond energy, βOHB possesses critical cellular signaling functions.
• βOHB's signaling roles link environmental cues to cellular activity and gene expression.

Purpose of the Study:

• To elucidate the multifaceted roles of beta-hydroxybutyrate (βOHB) beyond its metabolic functions.
• To explore βOHB's signaling pathways, including its interactions with HDACs and cell surface receptors.
• To understand the implications of βOHB's regulatory functions in metabolic diseases such as type 2 diabetes.

Main Methods:

• Investigated βOHB as an endogenous inhibitor of histone deacetylases (HDACs).
• Examined βOHB's function as a ligand for cell surface receptors.
• Analyzed the signaling activities of βOHB's downstream metabolic products (acetyl-CoA, succinyl-CoA, NAD+).

Main Results:

• βOHB acts as an endogenous inhibitor of histone deacetylases (HDACs).
• βOHB functions as a ligand for at least two cell surface receptors.
• Metabolic products of βOHB, including acetyl-CoA, succinyl-CoA, and NAD+, exhibit signaling activities.

Conclusions:

• βOHB is a key signaling molecule with diverse cellular regulatory functions.
• These regulatory roles of βOHB are crucial for connecting the environment to cellular function and gene expression.
• Understanding βOHB's signaling is vital for the pathogenesis and therapeutic strategies for metabolic diseases like type 2 diabetes.