[Pathogenesis of osteoarthritis--a snapshot]

[Arthrosis: a scientometric analysis]

BACKGROUND

In industrialized nations, arthrosis is one of the most frequent causes of physical disability and impaired quality of life in older people.

OBJECTIVES

There are still no direct and curative therapies. In addition, the causative mechanisms of this disease have not been sufficiently deciphered and investigated so far.

MATERIALS AND METHODS

For the present article, publications from 1900-2013 in the ISI Web of Science were reviewed. Quantitative and qualitative aspects are taken into account and are examined based on scientometric analysis methods. The illustrations demonstrate the global structure of the research and citation activity by Density Equalizing Map Projection. In addition, the radar charts illustrate the bi- and multilateral research and institutional cooperation.

RESULTS

On the basis of the search criteria, a total of 46,212 publications were identified. Approximately 95 % of the publications date back to the last 25 years. In addition to the number of publications, the number of citations has increased continuously. The analysis of the country collaborations as well as the number of institutions indicates a predominance of the United States. Most articles about arthrosis concern the subject areas of rheumatology, orthopedics, and surgery.

CONCLUSION

This study provides the first comprehensive, scientometric findings and illustrates corresponding representations of research activities, geographical contexts as well as research cooperation. It shows a great scientific interest, especially by North American and European scientists. The steady growth of research is explained by the high prevalence of arthrosis.

Identification of suitable reference genes in bone marrow stromal cells from osteoarthritic donors

Bone marrow stromal cells (BMSCs) are key cellular components for musculoskeletal tissue engineering strategies. Furthermore, recent data suggest that BMSCs are involved in the development of Osteoarthritis (OA) being a frequently occurring degenerative joint disease. Reliable reference genes for the molecular evaluation of BMSCs derived from donors exhibiting OA as a primary co-morbidity have not been reported on yet. Hence, the aim of the study was to identify reference genes suitable for comparative gene expression analyses using OA-BMSCs. Passage 1 bone marrow derived BMSCs were isolated from n=13 patients with advanced stage idiopathic hip osteoarthritis and n=15 age-matched healthy donors. The expression of 31 putative reference genes was analyzed by quantitative reverse transcription polymerase chain reaction (qRT-PCR) using a commercially available TaqMan(®) assay. Calculating the coefficient of variation (CV), mRNA expression stability was determined and afterwards validated using geNorm and NormFinder algorithms. Importin 8 (IPO8), TATA box binding protein (TBP), and cancer susceptibility candidate 3 (CASC3) were identified as the most stable reference genes. Notably, commonly used reference genes, e.g. beta-actin (ACTB) and beta-2-microglobulin (B2M) were among the most unstable genes. For normalization of gene expression data of OA-BMSCs the combined use of IPO8, TBP, and CASC3 gene is recommended.