Molecular Pathways Regulating Macrovascular Pathology and Vascular Smooth Muscle Cells Phenotype in Type 2 Diabetes

Area of Science:

• Cardiovascular Biology
• Endocrinology
• Molecular Medicine

Background:

• Type 2 diabetes mellitus (T2DM) is a global epidemic and a significant risk factor for cardiovascular diseases.
• T2DM induces macrovascular and microvascular changes, with vascular smooth muscle cells (VSMCs) playing a critical role in macrovascular alterations.
• VSMCs in T2DM patients exhibit altered phenotypes and functions due to changes in their intracellular biomolecular environment.

Purpose of the Study:

• To elucidate the biomolecular pathways and related genes in VSMCs that contribute to macrovascular alterations in T2DM.
• To identify potential therapeutic targets for mitigating T2DM-associated cardiovascular complications.

Main Methods:

• The study reviews the molecular mechanisms underlying VSMC alterations in T2DM.
• Focuses on the roles of hyperglycemia, advanced glycation-end products (AGEs), and key signaling pathways including NF-κB, MAPKs, Akt, and ERK1/2.
• Examines the impact of insulin and insulin-like growth factor receptors (IGFR) on VSMC apoptosis and phenotype.

Main Results:

• Hyperglycemia and AGEs activate NF-κB and MAPKs, increasing VSMC susceptibility to apoptosis.
• Reduced IGFR activity negatively affects miR-133a levels, further enhancing VSMC apoptotic susceptibility.
• Altered biomolecular pathways and gene expression promote a synthetic VSMC phenotype, leading to extracellular matrix changes in great vessels.

Conclusions:

• Understanding the specific biomolecular pathways and genetic alterations in VSMCs is crucial for comprehending T2DM-driven macrovascular complications.
• These insights can guide the development of novel targeted therapies for cardiovascular disease in T2DM patients.