Related Experiment Video

Updated: Jun 10, 2026

Subcutaneous Neurotrophin 4 Infusion Using Osmotic Pumps or Direct Muscular Injection Enhances Aging Rat Laryngeal Muscles
05:50

Subcutaneous Neurotrophin 4 Infusion Using Osmotic Pumps or Direct Muscular Injection Enhances Aging Rat Laryngeal Muscles

Published on: June 13, 2017

Y2 and Y4 receptor signalling attenuates the skeletal response of central NPY

Nicola J Lee1, Susan Allison, Ronaldo F Enriquez

  • 1Neuroscience Program, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW 2010, Australia.

Journal of Molecular Neuroscience : MN
|July 17, 2010
PubMed

Insights

Neuropeptide Y (NPY) and leptin systems interact uniquely via Y2 and Y4 receptors to regulate bone mass. This interaction, dependent on Y1 signaling, influences bone loss in leptin-deficient states.

Area of Science:

  • Endocrinology
  • Bone Biology
  • Neuroscience

Background:

  • Neuropeptide Y (NPY) and leptin are key central regulators of bone metabolism.
  • The intricate interplay between NPY and leptin systems in bone homeostasis remains incompletely understood.

Purpose of the Study:

  • To elucidate the specific interactions between Y2 and Y4 receptors in bone homeostasis.
  • To investigate how combined Y2/Y4 receptor deletion influences bone mass in leptin-deficient conditions.
  • To determine the role of Y1 receptor signaling in the response to elevated hypothalamic NPY.

Main Methods:

  • Utilized Y2/Y4 double knockout (Y2⁻/⁻ Y4⁻/⁻) mice on a leptin-deficient (ob/ob) background.
  • Employed virally mediated overexpression of NPY in the hypothalamus of Y receptor knockout mice.
  • Analyzed effects on both cancellous and cortical bone compartments.

Main Results:

  • Y2⁻/⁻ Y4⁻/⁻ mice on an ob/ob background exhibited reduced cancellous bone mass despite hypoleptinaemia.
  • Combined Y2/Y4 deletion exacerbated the impact of leptin deficiency on cortical bone.
  • Y2⁻/⁻ Y4⁻/⁻ mice showed an exaggerated response to elevated hypothalamic NPY's anti-osteogenic effects, dependent on Y1 receptor signaling.

Conclusions:

  • A unique interaction between Y2 and Y4 receptors is crucial for bone homeostasis, distinct from Y1 signaling.
  • Elevated hypothalamic NPY contributes to cortical bone loss in leptin deficiency.
  • The study reveals complex receptor interactions governing bone mass and highlights NPY's role in leptin-related bone changes.

More Related Videos

Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays11:28

Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays

Published on: February 9, 2022

Related Concept Videos

Sympathetic Signaling01:31

Sympathetic Signaling

Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
Transducer Mechanism: Enzyme-Linked Receptors01:27

Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Parasympathetic Signaling01:30

Parasympathetic Signaling

Parasympathetic signaling plays a crucial role in regulating various physiological processes. It involves the release of acetylcholine (ACh) by parasympathetic neurons, which can have localized and short-lived effects. The majority of ACh released is rapidly inactivated at the synapse by the enzyme acetylcholinesterase (AChE), which hydrolyzes Ach into choline and acetate. Additionally, the tissue cholinesterase deactivates any ACh diffusing into the surrounding tissues.
The effects of...
Regulation of Food Intake01:30

Regulation of Food Intake

Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla01:27

Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla

The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
Collateral Ganglia
Sympathetic preganglionic axons reach the collateral ganglia along the route of splanchnic nerves. These nerves bypass the sympathetic trunk and communicate with sympathetic postganglionic neurons housed in the prevertebral ganglia. These ganglia supply the organs of the abdominopelvic cavity.
The greater splanchnic nerve, formed by the...
Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
Several...