Related Experiment Video

Updated: May 16, 2026

Peptides from Phage Display Library Modulate Gene Expression in Mesenchymal Cells and Potentiate Osteogenesis in Unicortical Bone Defects
07:53

Peptides from Phage Display Library Modulate Gene Expression in Mesenchymal Cells and Potentiate Osteogenesis in Unicortical Bone Defects

Published on: December 10, 2010

Bone-specific overexpression of NPY modulates osteogenesis

I Matic1, B G Matthews, T Kizivat

  • 1Department of Reconstructive Sciences, University of Connecticut Health Center, Farmington, CT 06032, USA.

Journal of Musculoskeletal & Neuronal Interactions
|December 1, 2012
PubMed
Abstract

Insights

Bone-derived Neuropeptide Y (NPY) reduces bone formation. Overexpressing NPY in osteoblasts and osteocytes decreased bone volume and impaired osteogenic gene expression in mice, highlighting NPY

Area of Science:

  • Endocrinology
  • Bone Biology
  • Metabolic Regulation

Background:

  • Neuropeptide Y (NPY) is implicated in appetite and energy balance.
  • Genetic evidence suggests NPY negatively impacts bone formation centrally and peripherally.
  • NPY is produced by bone cells, including osteocytes and osteoblasts, suggesting a role in bone metabolism.

Purpose of the Study:

  • To investigate the specific role of NPY derived from bone cells in regulating bone metabolism.
  • To determine if osteoblast/osteocyte-derived NPY influences osteogenesis.

Main Methods:

  • Generation of a transgenic mouse model (Col2.3NPY) with NPY overexpression in mature osteoblasts and osteocytes.
  • In vivo characterization of bone phenotype in Col2.3NPY mice.
  • In vitro analysis of calvarial osteoblast cultures from Col2.3NPY mice.

Main Results:

  • Col2.3NPY mice exhibited reduced trabecular and cortical bone volume at 3 months.
  • Bone formation rate and osteoclast activity remained unchanged.
  • Osteoblast cultures showed decreased mineralization and reduced expression of osteogenic markers.

Conclusions:

  • Osteoblast/osteocyte-derived NPY can alter osteogenesis both in vivo and in vitro.
  • Bone-derived NPY is a significant factor in regulating bone formation.
  • Other peripheral NPY sources, like the sympathetic nervous system and vasculature, may also contribute to bone turnover.

More Related Videos

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model08:42

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

Published on: July 3, 2020

Related Concept Videos

NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
Hormones and Bone Tissue01:17

Hormones and Bone Tissue

The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Bone Remodeling and Repair01:31

Bone Remodeling and Repair

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
The Nucleolus02:55

The Nucleolus

The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
Bone Remodeling01:40

Bone Remodeling

Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.