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Background  Chondroprotective agents (CPA) such as glucosamine, curcumin and diacerein represent potential remedies for the management of osteoarthritis and several studies have been performed on their effects in-vitro and in-vivo. For the investigation of chondroprotective action on chondrocyte gene expression, quantitative real-time RT-PCR is the method of choice. However, validation of applied normalization strategies represents a crucial and sometimes neglected step in the analysis process. Therefore, the present study aimed to determine the expression stability of common reference genes ( ACTB , Beta actin;  GAPDH , Glyceraldehyde-3-phosphate;  B2M , Beta-2-microglobulin;  HPRT1 , Hypoxanthine phosphoribosyl-transferase I;  SDHA , Succinate dehydrogenase complex, subunit A;  YWHAZ , Tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein, zeta polypeptide) under the influence of glucosamine, curcumin and diacerein in the IL-1β-stimulated C-28/I2 chondrocyte model, using the geNorm software tool.    Results  CPA treatment of C-28/I2 chondrocytes significantly affected the expression level of many reference genes (p < 0.05). According to their expression stability, geNorm analysis revealed rankings of the 3 most stable genes (from most stable to least stable) as follows:  GAPDH, B2M  and  SDHA  in glucosamine treated samples and  HPRT1, GAPDH  and  B2M  in curcumin or diacerein treated samples. Interestingly,  ACTB  was one of the most variably expressed genes throughout all experiments.    Conclusion  Our study points out the problem of relying on commonly used reference genes without an accurate validation process. For normalization purposes in gene profiling studies on glucosamine action, the genes  GAPDH, B2M  and  SDHA  are recommended as single reference genes depending on the expression level of the target gene or more favourably in combination. For experiments with curcumin and diacerein the use of  HPRT1, GAPDH  and  B2M  should be considered.

Selection of reliable reference genes for qPCR studies on chondroprotective action