Related Experiment Video
Updated: Sep 14, 2026
Improved Method for the Preparation of a Human Cell-based, Contact Model of the Blood-Brain Barrier
Published on: November 13, 2013
Humanin rescues human cerebrovascular smooth muscle cells from Abeta-induced toxicity
Sonia S Jung1, William E Van Nostrand
1Department of Medicine, Stony Brook University, New York 11794, USA.
Insights
Humanin (HN) peptide protects human cerebrovascular smooth muscle cells from amyloid beta-protein (Abeta)-induced cell death and alpha-actin degradation, key features of Alzheimer's disease pathology.
Area of Science:
- Neuroscience
- Cell Biology
- Pathology
Background:
- Cerebral amyloid beta-protein (Abeta) angiopathy (CAA) is a critical pathological hallmark of Alzheimer's disease (AD).
- Pathogenic Abeta induces fibril assembly, increased Abeta precursor levels, alpha-actin degradation, and cell death in human cerebrovascular smooth muscle (HCSM) cells.
- Humanin (HN), a novel rescue factor, protects neuronal cells from Abeta-induced toxicity.
Purpose of the Study:
- To investigate the potential of humanin (HN) peptide to protect HCSM cells from Abeta-induced toxicity.
- To determine if HN can mitigate Abeta-mediated pathological responses in HCSM cells.
Main Methods:
- HCSM cells were treated with pathogenic Abeta and varying concentrations of HN peptide.
- Cell viability was assessed using fluorescent cell viability assays.
- Alpha-actin degradation was quantified using immunoblotting.
- Abeta deposition, fibril formation, and Abeta precursor protein (AbetaPP) levels were analyzed using thioflavin T fluorescence assays and immunochemical methods.
Main Results:
- Treatment with 10 microm HN significantly prevented Abeta-induced HCSM cell death.
- HN treatment diminished the degradation of HCSM cell alpha-actin.
- HN did not affect Abeta deposition, fibril formation, or cell-associated AbetaPP levels.
Conclusions:
- Humanin (HN) peptide acts as a rescue factor for HCSM cells against Abeta-mediated cell death.
- The protective effects of HN occur downstream of cell surface Abeta deposition and fibril formation.
- Neuronal cells and HCSM cells may share common downstream mechanisms in the Abeta-induced cell death pathway.
Abstract:
Cerebral amyloid beta-protein (Abeta) angiopathy (CAA) is a key pathological feature of Alzheimer's disease (AD) and related disorders. We have used human cerebrovascular smooth muscle (HCSM) cells as an in vitro model system to investigate the pathogenic mechanisms of the pathology of CAA. It was previously demonstrated that certain pathogenic forms of Abeta induce several pathologic responses in these cells, including fibril assembly at the cell surface, increased levels of Abeta precursor, degradation of HCSM cell alpha-actin and cell death. The recently discovered novel rescue factor humanin (HN) was shown to protect neuronal cells in culture from various AD-relevant insults including treatment with Abeta. In this report we investigated whether the HN peptide could rescue HCSM cells from Abeta-induced toxicity. We found that treatment of HCSM cells with 10 microm HN prevented pathogenic Abeta-induced HCSM cell death using a fluorescent cell viability assay, and degradation of HCSM alpha-actin was diminished shown by quantitative immunoblotting. However, Abeta deposition and fibril formation at the cell surface and increased levels of cell-associated AbetaPP were not affected by treatment with HN as demonstrated by a thioflavin T fluorescence assay and immunochemical methods, respectively. These results suggest that the protective effects of HN occur downstream of these cell surface molecular events. This is the first demonstration of a rescue factor for HCSM cells from Abeta-mediated cell death as well as being the first report to show that neuronal cells and HCSM cells may share a common downstream mechanism in the Abeta-induced cell death pathway.
