What is the fine-grained topic of the following text: Vascular smooth muscle cells (VSMCs) respond to arterial wall injury by intimal proliferation and play a key role in atherogenesis by proliferating and migrating excessively in response to repeated injury, such as hypertension and atherosclerosis. Only return the topic.
Role of Vascular Smooth Muscle Cells in Atherogenesis and Arterial Wall Injury Response