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Updated: Jun 12, 2025
Functional Interrogation of Adult Hypothalamic Neurogenesis with Focal Radiological Inhibition
Published on: November 14, 2013
Targeting MCH Neuroendocrine Circuit in Lateral Hypothalamus to Protect Against Skeletal Senescence
Bin Guo1, Yong Zhu1, Shuai Lu2,3
1Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, 410008, China.
Abstract:
Neuroendocrine regulation is essential for maintaining metabolic homeostasis. However, whether neuroendocrine pathway influence bone metabolism and skeletal senescence is unelucidated. Here, a central neuroendocrine circuit is identified that directly controls osteogenesis. Using virus based tracing, this study is identified that melanin concentrating hormone (MCH) expressing neurons in the lateral hypothalamus (LH) are connected to the bone. Chemogenetic activation of MCH neurons in the LH induces osteogenesis, whereas inhibiting these neurons reduces osteogenesis. Meanwhile, MCH is released into the circulation upon chemogenetic activation of these neurons. Single cell sequencing reveals that blocking MCH neurons in the LH diminishes osteogenic differentiation of bone marrow stromal cells (BMSCs) and induces senescence. Mechanistically, MCH promotes BMSC differentiation by activating MCHR1 via PKA signaling, and activating MCHR1 by MCH agonists attenuate skeletal senescence in mice. By elucidating a brain-bone connection that autonomously enhances osteogenesis, these findings uncover the neuroendocrinological mechanisms governing bone mass regulation and protect against skeletal senescence.
Insights
A newly identified brain-bone connection reveals that melanin concentrating hormone (MCH) neurons in the lateral hypothalamus (LH) directly control bone formation and prevent skeletal aging.
Area of Science:
- Neuroendocrinology
- Bone Biology
- Metabolic Homeostasis
Background:
- Neuroendocrine pathways are crucial for metabolic balance.
- The influence of neuroendocrine systems on bone metabolism and skeletal senescence remains largely unknown.
- Understanding brain-bone interactions is key to regulating bone mass.
Purpose of the Study:
- To identify a neuroendocrine circuit that directly regulates osteogenesis.
- To investigate the role of melanin concentrating hormone (MCH) in bone metabolism.
- To explore the impact of MCH on skeletal senescence.
Main Methods:
- Virus-based tracing to identify neural connections to bone.
- Chemogenetics to manipulate MCH neuron activity.
- Single-cell sequencing to analyze bone marrow stromal cells (BMSCs).
- MCH agonist administration in mice.
Main Results:
- Melanin concentrating hormone (MCH) neurons in the lateral hypothalamus (LH) directly connect to bone.
- Activating MCH neurons promotes osteogenesis; inhibiting them reduces it.
- MCH promotes BMSC differentiation via MCHR1 and PKA signaling.
- Blocking MCH neurons diminishes osteogenic differentiation and induces senescence.
- MCH agonists attenuate skeletal senescence in mice.
Conclusions:
- A novel brain-bone axis controlled by MCH neurons in the LH regulates osteogenesis.
- This pathway enhances bone formation and protects against skeletal senescence.
- Findings elucidate neuroendocrinological mechanisms governing bone mass and aging.
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