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Molecular analysis of arterial stenosis in rat carotids
A Forte1, G Di Micco, U Galderisi
1Institute of Pharmacology and Toxicology, Second University of Naples, Via Constantinopoli, 16, 80138 Naples, Italy.
Abstract:
A new model of surgical injury for the induction and development of stenosis in common rat carotids is described. This model differs from balloon angioplasty or vein graft systems currently applied on animals to develop stenosis, since it involves the entire vessel wall layers and mimics the injury occurring during arterial grafts, endarterectomy or organ transplantation. At different times following arterial damage, the pattern of expression of genes already known to be involved in the proliferation, differentiation, and apoptosis of smooth muscle cells (c-myc, Angiotensin II receptor 1, Bcl-2 and Bax alpha), as well as of Rb and Rb2 genes, whose pattern of expression after arterial injury has not yet been reported, was analyzed by semi-quantitative reverse transcription-polymerase chain reaction technique. Histological and histochemical analysis on carotid sections shows the morphological changes which occurred 30 days after surgical injury in the vessel wall. Molecular and histological data demonstrate that this model of surgical injury induces neointimal proliferation in about 30% of rats. In about 70% of the remaining rats, it induces the processes responsible for negative remodelling, namely the significant accumulation of extracellular matrix and fibers and disorganization of arterial tunics. This model is therefore available for further studies on the expression of genes involved in the arterial stenotic process, as well as for testing drugs aimed at limiting this recurrent pathophysiological phenomenon.
Insights
A novel surgical carotid injury model in rats effectively replicates arterial stenosis. This model aids research into smooth muscle cell gene expression and potential drug therapies for arterial remodeling diseases.
Area of Science:
- Vascular Biology and Surgery
- Molecular Medicine
- Regenerative Medicine
Background:
- Current animal models for arterial stenosis, such as balloon angioplasty or vein grafts, do not fully replicate the complex injury seen in human procedures.
- Arterial stenosis is a significant clinical problem following procedures like arterial grafting, endarterectomy, and organ transplantation.
- Understanding the molecular mechanisms underlying arterial remodeling is crucial for developing effective treatments.
Purpose of the Study:
- To introduce and characterize a new surgical injury model in rat carotid arteries for inducing and studying stenosis.
- To investigate the expression patterns of key genes involved in smooth muscle cell proliferation, differentiation, and apoptosis following arterial injury.
- To analyze the morphological and molecular changes in the vessel wall post-surgical injury.
Main Methods:
- Surgical induction of injury in the common rat carotid artery, affecting all vessel wall layers.
- Semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) to analyze gene expression (c-myc, Angiotensin II receptor 1, Bcl-2, Bax alpha, Rb, Rb2).
- Histological and histochemical analysis of carotid sections at 30 days post-injury.
Main Results:
- The surgical injury model successfully induced neointimal proliferation in approximately 30% of rats.
- In the remaining 70% of rats, the model led to negative remodeling, characterized by extracellular matrix accumulation and arterial tunic disorganization.
- Specific gene expression patterns related to smooth muscle cell fate and extracellular matrix remodeling were observed.
Conclusions:
- This new surgical injury model provides a robust platform for studying the molecular basis of arterial stenosis and negative remodeling.
- The model is suitable for investigating the roles of specific genes (e.g., c-myc, Rb, Rb2) in arterial wall remodeling.
- It offers a valuable tool for preclinical testing of therapeutic agents aimed at preventing or treating recurrent arterial stenosis.