Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Spatial and Temporal Regulation of Gene Expression in the Mammalian Growth Plate

ABSTRACT: To explore the mechanisms responsible for spatial and temporal regulation of the growth plate, we microdissected postnatal rat growth plates into their constituent zones and then used microarray analysis to characterize the changes in gene expression that occur as chondrocytes undergo spatially-associated differentiation and temporally-associated senescence. Microdissection was used to collect individual growth plate zones from proximal tibiae of 1-wk rats and the proliferative and early hypertrophic zones of growth plates from 3-, 6-, 9-, and 12-wk rats and gene expression was analyzed using microarray.

ORGANISM(S): Rattus norvegicus

SUBMITTER: Julian Lui

PROVIDER: E-GEOD-16981 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Spatial and temporal regulation of gene expression in the mammalian growth plate.

Lui Julian C K JC Andrade Anenisia C AC Forcinito Patricia P Hegde Anita A Chen WeiPing W Baron Jeffrey J Nilsson Ola O

Bone 20100122 5

Growth plates are spatially polarized and structured into three histologically and functionally distinct layers-the resting zone (RZ), proliferative zone (PZ), and hypertrophic zone (HZ). With age, growth plates undergo functional and structural senescent changes including declines of growth rate, proliferation rate, growth plate height and cell number. To explore the mechanisms responsible for spatially-associated differentiation and temporally-associated senescence of growth plate in an unbias ...[more]

PMID: 20096814

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Project description:Articular and growth plate cartilage have comparable structures consisting of three distinct layers of chondrocytes, suggesting similar differentiation programs and therefore similar gene expression profiles. To address this hypothesis and to explore transcriptional changes that occur during the onset of articular and growth plate cartilage divergence, we used microdissection of 10-day-old rat proximal tibial epiphyses, microarray analysis, and bioinformatics to compare gene expression profiles in individual layers of articular and growth plate cartilage. We found that many genes that were spatially upregulated in intermediate/deep zone of articular cartilage were also spatially upregulated in resting zone of growth plate cartilage (overlap greater than expected by chance, P < 0.001). Interestingly, superficial zone of articular cartilage showed an expression profile with similarities to both proliferative and hypertrophic zones of growth plate cartilage (P < 0.001 each). Additionally, significant numbers of known proliferative zone markers (3 out of 6) and hypertrophic zone markers (27 out of 126) were spatially upregulated in superficial zone compared to intermediate/deep zone (more than expected by chance, P < 0.001 each). In conclusion, we provide evidence that intermediate/deep zone of articular cartilage has a gene expression profile more similar to resting zone of growth plate cartilage, whereas superficial zone has a gene expression profile more similar to proliferative and hypertrophic zones. 10-day-old rat proximal tibial epiphyses were manually microdissected into articular cartilage superficial (SZ) and intermediate/deep (IDZ) zones and growth plate cartilage resting zone (RZ) for total RNA extraction and hybridization on Affymetrix microarrays. We used 10-day-old animals because, at this age, the secondary ossification center has recently begun to form and divides the epiphysis into articular cartilage distally and growth plate cartilage more centrally. The 4 SZ samples were taken from animals 5-8, respectively, whereas the 4 IDZ and 4 RZ samples were each taken from animals 1-2, 3-4, 5-6, and 7-8, respectively.

Dataset Information

Spatial and Temporal Regulation of Gene Expression in the Mammalian Growth Plate

Publications

Spatial and temporal regulation of gene expression in the mammalian growth plate.

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