Crocin prevents platelet‑derived growth factor BB‑induced vascular smooth muscle cells proliferation and phenotypic switch

Tong,Lijian; Qi,Guoxian

doi:10.3892/mmr.2018.8854

Crocin prevents platelet‑derived growth factor BB‑induced vascular smooth muscle cells proliferation and phenotypic switch

Authors:
- Lijian Tong
- Guoxian Qi
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Affiliations: Department of Geriatrics, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
Published online on: April 5, 2018 https://doi.org/10.3892/mmr.2018.8854
Pages: 7595-7602
Copyright: © Tong et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The phenotypic switch of vascular smooth muscle cells (VSMCs) is a major initiating factor for atherosclerotic cardiovascular diseases. Platelet‑derived growth factor‑BB (PDGF‑BB) initiates a number of biological processes that contribute to VSMC proliferation and phenotypic switch. Crocin, a component of saffron, has been reported to inhibit atheromatous plaque formation. However, the effects of crocin on PDGF‑BB‑induced VSMC proliferation and phenotypic switch remain unclear. The aim of the present study was to investigate the role of crocin on PDGF‑BB‑induced VSMCs proliferation and phenotypic switch and its underlying mechanisms. Cell proliferation and markers of VSMCs phenotypic switch were measured using a Cell Counting Kit‑8 assay and western blot analysis, respectively. The signaling pathways involved in the effects of crocin on VSMCs were validated by western blot analysis with or without the use of specific pathway inhibitors. Crocin significantly inhibited PDGF‑BB‑induced VSMCs proliferation compared with the PDGF‑BB only group (P<0.05). In addition, crocin significantly abrogated the PDGF‑BB‑induced increase in contractile protein α‑smooth muscle actin, calponin and decrease in synthetic proteins osteopontin (OPN) in a concentration dependent manner (P<0.05). In addition, crocin slowed PDGF‑BB‑induced Janus kinase (JAK)‑signal transducer and activator of transcription 3 (STAT3) and extracellular signal‑regulated kinase (ERK)/Kruppel‑like factor 4 (KLF4) signaling activation in VSMCs. By applying the JAK inhibitor (AG490) and ERK1/2 inhibitor (U0126), the results suggested that the crocin inhibited PDGF‑BB‑induced VSMCs phenotypic switch through the JAK/STAT3 and ERK/KLF4 signaling pathways. These results suggested that crocin may effectively prevent PDGF‑BB‑induced VSMCs proliferation and phenotypic switch and may be a promising candidate for the therapy of atherosclerotic cardiovascular diseases.

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