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Updated: May 15, 2026

Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice
Published on: March 24, 2017
Molecular targets for therapy in systemic sclerosis
Naoki Iwamoto1, Oliver Distler1
1Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, Gloriastrasse 25, 8091 Zürich, Switzerland.
Abstract:
Despite significant advances have been made in the recent years regarding organ-specific therapies, there is no approved 'disease-modifying' antifibrotic drug for systemic sclerosis (SSc) available to date. Although non-selective immunosuppressive agents are routinely used to treat patients with SSc, large well-controlled studies are lacking for almost all immunosuppressive agents and further evidence is required for long-term beneficial effects of these drugs. Considering these facts about immunosuppressive agents in SSc and also considering the high mortality of SSc, other therapeutic strategies are urgently needed. Recently an important role of the 5-hydroxytryptamine (5-HT: serotonin) pathway in fibrosis was reported. In this review, we discuss the role of 5-HT in fibrosis and therapeutic potential of this molecule. Besides 5-HT, there are a number of promising targets that have been extensively characterized in recent years. For many of these molecular targets, modifiers are readily available for clinical studies, and often these modifiers are used already in clinical use for other diseases. Results from these studies will show, in how far the promising preclinical results for novel antifibrotic strategies can be translated to clinical practice.
Insights
Systemic sclerosis (SSc) lacks disease-modifying antifibrotic drugs. This review explores the role of serotonin (5-hydroxytryptamine or 5-HT) and other novel targets in developing effective antifibrotic therapies for SSc.
Area of Science:
- Pharmacology
- Rheumatology
- Fibrosis Research
Background:
- Systemic sclerosis (SSc) currently lacks approved disease-modifying antifibrotic therapies.
- Established immunosuppressive agents for SSc have limited supporting evidence for long-term efficacy.
- High SSc mortality necessitates urgent development of alternative therapeutic strategies.
Purpose of the Study:
- To review the role of the serotonin (5-hydroxytryptamine, 5-HT) pathway in fibrosis.
- To discuss the therapeutic potential of 5-HT and other novel molecular targets for SSc.
- To evaluate the translation of preclinical antifibrotic findings to clinical practice.
Main Methods:
- Literature review focusing on the role of 5-HT in fibrosis.
- Analysis of recent research on molecular targets for antifibrotic therapies.
- Examination of preclinical data and potential clinical applications.
Main Results:
- The 5-hydroxytryptamine (5-HT) pathway has emerged as a significant factor in fibrotic processes.
- Several promising molecular targets, with available clinical modifiers, show potential for antifibrotic activity.
- Preclinical data suggests the feasibility of translating novel antifibrotic strategies into clinical practice.
Conclusions:
- Targeting the 5-HT pathway represents a promising avenue for SSc treatment.
- Further clinical studies are essential to validate novel antifibrotic strategies for SSc.
- Repurposing existing drugs for antifibrotic therapy in SSc warrants investigation.
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