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Biological activity of tyrosine kinase inhibitors: novel agents for psoriasis therapy
1Israel National Skin Bank, Hadassah Medical Organization, Jerusalem. benbassat@md.huji.ac.il
Abstract:
Uncontrolled signaling from protein tyrosine kinases (PTKs) can lead to numerous proliferative and inflammatory diseases, and identification of the specific PTKs that play a key role in a defined disease could potentially lead to a selective therapeutic agent. In psoriasis, the balance of signals that regulate the homeostasis of normal epidermis is altered. Several lines of evidence suggest a role for the epidermal growth factor receptor (EGFR) system in this process. The PTK inhibitor from the tyrphostins family--AG-1571 (SU-5271) potently inhibits proliferation of psoriatic keratinocytes in excellent correlation with its EGFR kinase inhibitory activity, and was in clinical trials by SUGEN Inc. The recently developed in vivo models of psoriasis may become useful tools to evaluate PTK inhibitors to treat the disease and open a novel specific therapeutic approach. This article summarizes recent progress in the development of PTK inhibitors in the treatment of psoriasis.
Insights
Protein tyrosine kinase (PTK) inhibitors, like AG-1571, show promise for treating psoriasis by targeting epidermal growth factor receptor (EGFR) signaling. This offers a novel therapeutic approach for this inflammatory skin disease.
Area of Science:
- Dermatology
- Oncology
- Pharmacology
Background:
- Uncontrolled protein tyrosine kinase (PTK) signaling drives proliferative and inflammatory diseases.
- Psoriasis involves altered epidermal homeostasis, with evidence implicating the epidermal growth factor receptor (EGFR) system.
Purpose of the Study:
- To summarize recent advancements in developing PTK inhibitors for psoriasis treatment.
- To highlight the potential of targeting specific PTKs for selective therapeutic agents.
Main Methods:
- Review of studies on PTK inhibitors, specifically AG-1571 (a tyrphostin derivative).
- Evaluation of AG-1571's efficacy in inhibiting psoriatic keratinocyte proliferation and EGFR kinase activity.
- Consideration of newly developed in vivo psoriasis models for drug evaluation.
Main Results:
- AG-1571 potently inhibits psoriatic keratinocyte proliferation.
- Inhibitory activity of AG-1571 strongly correlates with its EGFR kinase inhibitory activity.
- AG-1571 has undergone clinical trials.
Conclusions:
- PTK inhibitors represent a promising therapeutic strategy for psoriasis.
- Targeting EGFR with inhibitors like AG-1571 may offer a novel, specific treatment approach.
- In vivo psoriasis models are valuable for evaluating PTK inhibitors.
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