New Class of Anti-Arthritis Drugs Effectively Treats Multiple Inflammatory Diseases
Commonly prescribed anti-arthritics can exacerbate other inflammatory diseases like periodontitis, according to new research published in The American Journal of Pathology
Philadelphia, PA, July 10, 2014 /3BL Media/ – Inflammatory diseases can occur simultaneously in distinct sites in the same patient, complicating treatment because a medication effective for one disorder may exacerbate the other. One such example is the anti-arthritic medication dexamethasone, which alleviates joint disease but can worsen periodontal bone disease. A study in the August issue of The American Journal of Pathology highlights the effects of a new class of anti-arthritic drugs, specifically DTrp8-ɣMSH (DTrp), that acts via the melanocortin (MC) system to reduce both arthritic joint inflammation and periodontitis.
“This research, a joint program with the Universidade Federal de Minas Gerais in Brazil, indicates that MC receptor agonists, possibly better if selective for MC3, represent a novel class of anti-arthritic therapeutics able to target joint disease without aggravating unwanted effects on distant organs and tissues,” says Mauro Perretti, PhD, of Queen Mary University of London, Barts, and The London School of Medicine and Dentistry (UK).
More than 60 years ago, adrenocorticotropic hormone (ACTH) was shown to be effective for treating rheumatoid and gouty arthritis, yet its current clinical use is very sporadic. It is now appreciated that some of the anti-inflammatory actions of ACTH are mediated via the peripheral MC system on MC receptors expressed in bone cells, fibroblasts, and immune cells. Research has shown that activation of MC receptors by ACTH or other MC peptides can lead to a variety of protective actions against bone loss, including increased matrix deposition, reduced osteoclast activation, and enhanced proliferation of bone-forming cells.
In this study, researchers first determined whether mice that were induced with experimental arthritis also manifested bone loss in the alveolar (tooth socket) bone. They found that bone loss in the jaw correlated with the severity of localized inflammation in the joints of the mice.
They next compared the effects of a peptide that selectively activates MC3 receptors in mice on both arthritis and alveolar bone loss, and compared the effects to other known medications. The glucocorticoid dexamethasone exerted potent anti-arthritic effect, which were, however, inversely correlated with protection against bone loss. This was markedly distinct from the effect seen with DTrp, which showed a highly positive correlation between clinical score and bone loss (ie reduced bone loss associated with better anti-arthritic effect). Calcitonin had little effect on arthritis but did protect against alveolar bone loss. “This finding is of relevance as prolonged steroid therapy is associated with bone density loss, osteoporosis, and fractures; melanocortin-based therapeutics could spare these unwanted actions,” says Dr. Perretti.
“DTrp could be viewed as a starting point for a new class of bone-sparing anti-arthritic agents,” says John L. Wallace, PhD, MBA, of the Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada and University of Toronto, in a commentary on these findings. “This study highlights the continued value of simpler and cheaper (for both the maker and the end-user) approaches to drug development, harnessing the potential of endogenous anti-inflammatory mechanisms.”
According to Dr. Wallace, drugs that harness endogenous anti-inflammatory mechanisms like the MC system offer a number of advantages: they produce a wide range of anti-inflammatory effects, promote the healing of injured tissue, and are potentially associated with very few adverse effects. He comments that these medications “hold out significant promise for safely treating a wide range of inflammatory disorders including, like MC3 agonists, co-existing inflammatory diseases in the same patient.
---
Notes for editors
“Association between Periodontal Disease and Inflammatory Arthritis Reveals Modulatory Functions by Melanocortin Receptor Type 3,” by Trinidad Montero-Melendez, Mila Fernandes Moreira Madeira, Lucy V. Norling, Asil Alsam, Michael A. Curtis, Tarcília Aparecida da Silva, and Mauro Perretti. (DOI: http://dx.doi.org/10.1016/j.ajpath.2014.04.009).
This work was supported in part by an MRC (MR/K013068/1) research grant, the William Harvey Research Foundation, and CNPq (Brazil).
“Exploiting Endogenous Anti-Inflammatory Pathways as a Therapeutic Approach to Multi-Organ Inflammatory Disease,” John L. Wallace (DOI: http://dx.doi.org/10.1016/j.ajpath.2014.05.001).
Both appear online ahead of The American Journal of Pathology, Volume 185/Issue 2 (August 2014) published by Elsevier.
Full text of the articles is available to credentialed journalists upon request; contact Eileen Leahy at +1 732 238 3628 or ajpmedia@elsevier.com. Journalists wishing to interview Dr. Mauro Perretti should contact Charli Scouller, PR Manager, The London School of Medicine and Dentistry, at +44 20 7882 7943 or c.scouller@qmul.ac.uk. Reporters may contact Dr. John L. Wallace directly at altapharm@hotmail.com.
About The American Journal of Pathology
The American Journal of Pathology, official journal of the American Society for Investigative Pathology, seeks to publish high-quality, original papers on the cellular and molecular biology of disease. The editors accept manuscripts that advance basic and translational knowledge of the pathogenesis, classification, diagnosis, and mechanisms of disease, without preference for a specific analytic method. High priority is given to studies on human disease and relevant experimental models using cellular, molecular, animal, biological, chemical, and immunological approaches in conjunction with morphology.
The leading global forum for reporting quality original research on cellular and molecular mechanisms of disease, The American Journal of Pathology is the most highly cited journal in Pathology – over 38,000 cites in 2012 – with an Impact Factor of 4.522 and Eigenfactor of 0.07599 according to the 2012 Journal Citation Reports®, Thomson Reuters, and an h-index of 181 according to the 2011 SCImago Journal and Country Rank.
About Elsevier
Elsevier is a world-leading provider of information solutions that enhance the performance of science, health, and technology professionals, empowering them to make better decisions, deliver better care, and sometimes make groundbreaking discoveries that advance the boundaries of knowledge and human progress. Elsevier provides web-based, digital solutions — among them ScienceDirect, Scopus, Elsevier Research Intelligence and ClinicalKey — and publishes nearly 2,200 journals, including The Lancet and Cell, and over 25,000 book titles, including a number of iconic reference works.
The company is part of Reed Elsevier Group PLC, a world-leading provider of professional information solutions in the Science, Medical, Legal and Risk and Business sectors, which is jointly owned by Reed Elsevier PLC and Reed Elsevier NV. The ticker symbols are REN (Euronext Amsterdam), REL (London Stock Exchange), RUK and ENL (New York Stock Exchange).
Media contacts
Eileen Leahy
Elsevier
+1 732 238 3628
ajpmedia@elsevier.com
Dr. Chhavi Chauhan
Scientific Editor
The American Journal of Pathology
+1 301 634 7953
cchauhan@asip.org
