Docosahexaenoic Acid Inhibits Vascular Smooth Muscle Cell Proliferation Induced by Glucose Variability
Kaliyaperumal Rani*, Nway Y. Aung
Identifiers and Pagination:Year: 2017
First Page: 56
Last Page: 65
Publisher ID: TOBIOCJ-11-56
Article History:Received Date: 08/10/2016
Revision Received Date: 23/02/2017
Acceptance Date: 17/03/2017
Electronic publication date: 30/06/2017
Collection year: 2017
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Vascular Smooth Muscle cells (VSMC) enact crucial roles in early vasculogenesis and sustenance of vascular integrity. However, aberrant proliferation of VSMC followed by migration into the blood vessel wall leads to the formation of vascular lesions accounting for the degeneration and remodelling of vascular basement membrane. In diabetes, hyperglycaemia accelerates VSMC proliferation and contributes to the initiation and progression of atherosclerotic lesions. Recently, acute glucose fluctuations have been implicated in the abnormal VSMC proliferation and complications of diabetic atherosclerosis. Docosahexaenoic acid (DHA), a ω-3 polyunsaturated fatty acid (PUFA) has been shown to inhibit proliferation of several cell types implicating several different mechanisms. In the present study, we have investigated the effects of DHA on VSMC proliferation induced by stable and intermittent high glucose levels.
Confluent cultures of rat aortic VSMCs were treated with DHA for 24 hrs and then exposed to stable high glucose (25 mmol/L, SHG) or intermittent high glucose (5 mmol/L and 25 mmol/L alternating every 12 hrs, IHG) for 72 hrs. Cell proliferation was examined by the MTT viability assay, while apoptosis process was evaluated by the Hoechst staining, flow cytometry and caspase-3 activity assays.
Our data demonstrated that the hyper proliferation induced by stable and intermittent high glucose levels was significantly inhibited by the DHA pre-treatment. DHA significantly increased caspase-3 activity, resulting in enhanced DNA fragmentation and apoptosis.
Our results suggest that DHA reduced the high glucose-induced proliferation of VSMC and induced cell apoptosis.