Cardiovascular Regulation by the Neuronal BBSome

Area of Science:

• Neuroscience
• Cardiovascular Physiology
• Genetics

Background:

• The BBSome complex is crucial for cilia function and cellular processes.
• Its role in blood pressure regulation is known but not fully understood.
• Neuronal BBSome involvement in blood pressure control is investigated.

Purpose of the Study:

• To elucidate the role of the neuronal BBSome in blood pressure regulation.
• To determine the mechanisms underlying BBSome's influence on blood pressure.
• To investigate BBSome's function independent of cilia.

Main Methods:

• Targeted gene deletion of BBSome components (Bbs1) in specific neuronal populations in mice.
• Assessment of blood pressure, sympathetic nerve activity, and vascular responses.
• Investigation of intraflagellar transport (IFT) machinery and adrenergic receptor expression.

Main Results:

• BBSome inactivation in the nervous system, specifically in leptin receptor neurons, increased blood pressure.
• This effect was independent of cilia formation/function, as IFT gene deletion had no impact.
• BBSome deletion in AgRP or POMC neurons increased sympathetic activity but not blood pressure, linked to vascular adrenergic desensitization.

Conclusions:

• The neuronal BBSome is a novel regulator of blood pressure, sympathetic activity, and vascular function.
• Its prohypertensive effects are mediated independently of cilia.
• Neuronal BBSome dysfunction may contribute to cardiovascular and metabolic disorders.