The effect of tyrphostin AG-556 on intimal thickening in a mouse model of arterial injury

Jacob George, Iris Barshack, Pnina Keren, Aviv Gazit, Alexander Levitzki, Gad Keren, Arie Roth

Research output: Contribution to journalArticlepeer-review


Background. Inflammation has been shown to play an important role in promoting the response to arterial injury and proinflammatory cytokines, such as tumor necrosis factor (TNF) alpha, are candidate mediators. AG-556 is a tyrosine kinase inhibitor proven to be effective in a model of multiple sclerosis-like syndrome in mice due to its immunomodulating effect. In the current study, we investigated the effect of the tyrphostin AG-556 on neointimal thickening and cytokine profile in a model of arterial injury in the mouse. Methods. Injury was induced by external cuff placement on the left femoral artery of wild-type C57BL/6 mice. AG-556 dissolved in DMSO was injected intraperitoneally daily to the injured mice in a dosage of 2 mg/mouse. Control mice received DMSO injections. Histological analysis was carried out to assess neointimal formation. Splenocytes were cultured in the absence and presence of a mitogen for evaluation of thymidine incorporation and cytokine production. Results. AG-556 treatment significantly attenuated intimal thickening (43,000 ± 17,000 μm2; n = 11) when compared to DMSO administration (286,000 ± 127,000 μm2; n = 10; P < 0.05). Basal interferon-gamma production by splenocytes from AG-556-treated mice was increased by approximately 20-fold in comparison with levels in DMSO-treated animals, whereas Con-A induced secretion of the cytokine was similar between both groups. Levels of TNF-alpha, IL-4 and IL-10 in the culture supernatant from treated and non-treated animals did not differ significantly. Conclusion. The tyrosine kinase inhibitor AG-556 may have a role in the reduction of intimal thickening. The effect could be mediated via an immune modulating effect involving a significant increase in the smooth muscle cell inhibitory cytokine IFN-gamma.

Original languageEnglish
Pages (from-to)233-238
Number of pages6
JournalExperimental and Molecular Pathology
Issue number3
StatePublished - Jun 2005


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