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Neuropeptide Y-induced angiogenesis in aging
Joanna Kitlinska1, Edward W Lee, Sharareh Movafagh
1Department of Physiology and Biophysics, Georgetown University Medical Center, 3900 Reservoir Road NW, Washington, DC 20007, USA. jbk4@georgetown.edu
Peptides
|January 30, 2002
Summary
Neuropeptide Y (NPY)-driven blood vessel growth (angiogenesis) declines with age. This impairment is linked to reduced NPY receptor (Y2) and enzyme (DPPIV) expression in aged mice and human cells.
Area of Science:
- Vascular Biology
- Aging Research
- Neuropeptide Signaling
Background:
- Neuropeptide Y (NPY) plays a role in regulating physiological processes, including blood vessel formation.
- Understanding age-related changes in NPY's function is crucial for addressing vascular health in aging populations.
Purpose of the Study:
- To investigate the impact of aging on Neuropeptide Y (NPY)-dependent angiogenesis.
- To identify molecular mechanisms underlying age-related decline in NPY-mediated vascular growth.
Main Methods:
- Utilized Matrigel and aortic sprouting assays in young (2 months) and aged (18 months) mice.
- Assessed NPY-induced vessel growth.
- Quantified expression of NPY Y2 receptors and dipeptidyl peptidase IV (DPPIV) via RT-PCR in mouse spleens.
- Examined in vitro responses of aged human microvascular endothelial cells to NPY.
Main Results:
- NPY-induced angiogenesis was significantly reduced in aged mice compared to young mice.
- Aged mice exhibited decreased splenic expression of NPY Y2 receptors and DPPIV.
- Aged human microvascular endothelial cells showed diminished mitogenic responses to NPY and lacked NPY receptor mRNA.
Conclusions:
- NPY-dependent angiogenesis is impaired during aging.
- This impairment is associated with reduced expression of endothelial NPY receptors (specifically Y2) and the NPY-converting enzyme DPPIV.