Project description:Cartilage originates from mesenchymal cell condensations that differentiate into chondrocytes of transient growth plate cartilage or permanent cartilage of the articular joint surface and trachea. MicroRNAs fine-tune the activation of entire signaling networks and thereby modulate complex cellular responses, but so far only limited data are available on miRNAs that regulate cartilage development. Here we characterize an miRNA which promotes the biosynthesis of a key component in the RAF/MEK/ERK pathway in cartilage. Specifically, by transcriptome profiling we identified miR-322 to be upregulated during chondrocyte differentiation. Among the various miR-322 target genes in the RAF/MEK/ERK pathway, only Mek1 was identified as a regulated target in chondrocytes. Surprisingly, an increased concentration of miR-322 stabilizes Mek1-mRNA to arise protein levels and dampen ERK1/2 phosphorylation, while cartilage-specific inactivation in mice linked the loss of miR-322 to decreased MEK1 levels and increased RAF/MEK/ERK pathway activation. Such mice died perinatally due to tracheal growth restriction and respiratory failure. Hence, a single miRNA can stimulate the production of an inhibitory component of a central signaling pathway to impair cartilage development.

2017-10-03 | GSE98036 | GEO

Conditional Deletion of Fgfr3 in Chondrocytes leads to Osteoarthritis-like Defects in Temporomandibular Joint of Adult Mice.

Project description: Not available

| S-EPMC4819201 | biostudies-literature

Expression data from articular and growth plate cartilage

2011-07-29 | GSE23492 | GEO

MEPE is a novel regulator of growth plate cartilage mineralization.

Project description: Not available

| S-EPMC3427007 | biostudies-literature

Fkbp10 Deletion in Osteoblasts Leads to Qualitative Defects in Bone.

Project description: Not available

| S-EPMC5466482 | biostudies-literature

Upper zone of growth plate and cartilage matrix associated protein protects cartilage during inflammatory arthritis.

Project description: Not available

| S-EPMC5932879 | biostudies-literature

Expression data from articular and growth plate cartilage

Project description:The aim of the current study was to identify molecular markers for articular cartilage that can be used for the quality control of tissue engineered cartilage. Therefore a genom-wide expression analysis was performed using RNA isolated from articular and growth plate cartilage, both extracted from the knee joints of minipigs. Keywords: Native material or primary cells isolated from articular cartilage and growth plate cartilage Articular and growth plate cartilage were taken for RNA extraction and hybridization on Affymetrix microarrays. Furthermore chondrocytes from each type of cartilage were isolated and cell culture was started and terminated at day 10 or day 20. Total RNA from cultivated cells was extracted, and hybridization on Affymetrix microarrays was performed.

2011-07-28 | E-GEOD-23492 | biostudies-arrayexpress

Differential ageing of growth plate cartilage determines skeletal proportions

Project description:Bones at different anatomical locations vary dramatically in size. The mechanisms responsible for these size differences are poorly understood. Bone elongation occurs at the growth plates and advances rapidly in early life but then progressively slows due to a developmental program termed growth plate senescence. This developmental program includes declines in cell proliferation and hypertrophy, depletion of cells in all growth plate zones, and extensive underlying changes in the expression of growth-regulating genes. Here we use RNA-Seq to compare changes of gene expression with age in the longer bone (tibia, 1- vs 4-wk) with the difference of gene expression between long and short bones (tibia vs phalanx) at 1wk. We found that the developmental program of growth plate senescence is more advanced in the shorter bone and this differential senescence (or aging) underlies the disparities in bone length.

2018-06-19 | GSE114919 | GEO

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