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The effects of oral glucosamine on joint health: is a change in research approach needed?
J A Block1, T R Oegema, J D Sandy
1Department of Internal Medicine (Rheumatology), Rush University Medical Center, Chicago IL 60612, USA. jblock@rush.edu
Objective:
Oral glucosamine (GlcN) has been widely studied for its potential therapeutic benefits in alleviating the pain and disability of osteoarthritis (OA). Its popularity has grown despite ongoing controversy regarding its effectiveness vs placebo in clinical trials, and lack of information regarding possible mechanisms of action. Here, we review the state of knowledge concerning the biology of GlcN as it relates to OA, and discuss a framework for future research directions.
Methods:
An editorial "narrative" review of peer-reviewed publications is organized into four topics (1) Chemistry and pharmacokinetics of GlcN salts (2) Biological effects of GlcN salts in vitro (3) Therapeutic effects of GlcN salts in animal models of OA and (4) GlcN salts in the treatment of clinical OA.
Results:
Data reporting potent pleiotropic activities of GlcN in in vitro cell and explant cultures are discussed in the context of the established pharmacokinetic data in humans and animals. The available clinical trial data are discussed to place the patient in the context of controlled research on disease management.
Conclusions:
Future research to determine therapeutic mechanisms of GlcN salt preparations will require use of standardized and clinically relevant in vitro assay systems and in vivo animal models for testing, as well as development of new outcome measures for inflammation and pain pathways in human OA.
Insights
Glucosamine (GlcN) shows potential for osteoarthritis (OA) pain relief, but its effectiveness and mechanisms remain debated. Further research is needed to clarify its therapeutic role in OA management.
Area of Science:
- Biochemistry
- Pharmacology
- Rheumatology
Background:
- Oral glucosamine (GlcN) is widely used for osteoarthritis (OA) pain and disability.
- Its clinical effectiveness and mechanisms of action are subjects of ongoing debate.
- Existing research lacks comprehensive understanding of GlcN's biological effects in OA.
Purpose of the Study:
- To review current knowledge on glucosamine's biology in relation to osteoarthritis.
- To discuss the existing evidence on glucosamine's effectiveness and mechanisms.
- To propose a framework for future research directions in glucosamine for OA.
Main Methods:
- Narrative review of peer-reviewed publications.
- Organized into four topics: chemistry/pharmacokinetics, in vitro biological effects, animal models, and clinical OA treatment.
- Analysis of data on pleiotropic activities, pharmacokinetics, and clinical trial results.
Main Results:
- Glucosamine exhibits potent pleiotropic activities in vitro.
- Pharmacokinetic data in humans and animals are established.
- Clinical trial data are discussed in the context of disease management.
Conclusions:
- Standardized in vitro and in vivo models are needed to determine therapeutic mechanisms.
- Development of new outcome measures for inflammation and pain pathways is crucial.
- Further research is required to validate glucosamine's role in OA treatment.