CCR1 antagonists: what have we learned from clinical trials
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Updated: Jun 12, 2026

Chemical Inactivation of the E3 Ubiquitin Ligase Cereblon by Pomalidomide-based Homo-PROTACs
Published on: May 15, 2019
Ronald P Gladue1, Matthew F Brown, Samuel H Zwillich
1Pfizer Global Research and Development,Eastern Point Road,Groton, CT 06340, USA. Ronald.P.Gladue@Pfizer.com
Abstract:
The identification of chemokines and their receptors as potent mediators of leukocyte infiltration raised interest in the potential role of these proteins on disease pathogenesis. This is exemplified by the chemokine receptor, CCR1, which has been shown to be up-regulated in a number of human diseases, the implications of which have been suggested by animal models where inhibition of CCR1 or its ligands have shown beneficial effects. These data support the possibility that a CCR1 antagonist will provide therapeutic benefit to patients with inflammatory diseases. Over the last several years, several of these antagonists entered clinical trials, including CP-481,715 (Pfizer) and MLN3897 (Millennium) for rheumatoid arthritis, BX471 (Berlex / Scherring AG) for multiple sclerosis, and AZD-4818 (Astra-Zeneca) for COPD. This review will describe the evidence that supported the role of CCR1 in these diseases, the results from clinical trials, and provide perspectives on what has been learned from these trials for potential application / consideration to other studies with chemokine receptor antagonists.
Insights
Chemokine receptor CCR1 plays a role in inflammatory diseases. CCR1 antagonists show therapeutic potential, with several drugs entering clinical trials for conditions like rheumatoid arthritis and multiple sclerosis.
Area of Science:
- Immunology
- Pharmacology
- Pathogenesis of inflammatory diseases
Background:
- Chemokines and their receptors mediate leukocyte infiltration, suggesting a role in disease.
- CCR1 is upregulated in various human diseases, with animal models showing benefits from CCR1 inhibition.
- CCR1 antagonists are being investigated for therapeutic applications in inflammatory conditions.
Purpose of the Study:
- To review evidence supporting CCR1's role in inflammatory diseases.
- To summarize results from clinical trials of CCR1 antagonists.
- To provide insights for future chemokine receptor antagonist studies.
Main Methods:
- Review of scientific literature on chemokines, CCR1, and inflammatory diseases.
- Analysis of data from clinical trials involving CCR1 antagonists.
- Synthesis of findings to inform future research directions.
Main Results:
- Evidence supports CCR1's involvement in rheumatoid arthritis, multiple sclerosis, and COPD.
- Several CCR1 antagonists (e.g., CP-481,715, MLN3897, BX471, AZD-4818) have advanced to clinical trials.
- Clinical trial outcomes provide valuable lessons for developing future chemokine receptor antagonists.
Conclusions:
- CCR1 antagonists hold therapeutic promise for inflammatory diseases.
- Clinical trial experiences offer critical insights for optimizing the development of novel chemokine receptor antagonists.
- Further research is warranted to fully leverage the therapeutic potential of targeting the CCR1 pathway.
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