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Quantitative PCR-based Assay to Measure Sonic Hedgehog Signaling in Cellular Model of Ciliogenesis
Published on: January 31, 2025
Peripheral chondrosarcoma progression is accompanied by decreased Indian Hedgehog signalling
L Hameetman1, L B Rozeman, M Lombaerts
1Department of Pathology, Leiden University Medical Centre, The Netherlands.
The Journal of Pathology
|June 7, 2006
Summary
Hedgehog (HH) signaling, crucial for development, is disrupted in Multiple Osteochondromas. Its activity decreases with chondrosarcoma progression, while TGF-beta signaling increases, potentially driving tumor growth.
Area of Science:
- Oncology
- Developmental Biology
- Molecular Biology
Background:
- Hedgehog (HH) signaling regulates development and is implicated in various tumors and Multiple Osteochondromas.
- Indian Hedgehog (IHH) and parathyroid hormone-like hormone (PTHLH) organize long bone growth plates.
- PTHLH signaling is absent in osteochondromas but reactivated during malignant transformation.
Purpose of the Study:
- To investigate the role of HH and TGF-beta signaling in the progression of osteochondromas to secondary peripheral chondrosarcomas.
- To analyze changes in gene expression associated with malignant transformation and tumor progression.
Main Methods:
- cDNA expression profiling
- Immunohistochemical studies
- Analysis of gene expression for HH pathway components (PTCH, GLI1, GLI2) and TGF-beta pathway targets.
Main Results:
- HH signaling components (PTCH, GLI1, GLI2) showed decreased expression with increasing malignancy in chondrosarcomas.
- TGF-beta pathway targets were upregulated in high-grade chondrosarcomas, indicating active proliferative signaling.
- Energy metabolism genes were downregulated, and the proto-oncogene jun B was upregulated during chondrosarcoma progression.
Conclusions:
- HH signaling regulation of growth plates is lost during malignant transformation of osteochondromas to chondrosarcomas.
- TGF-beta signaling is stimulated during chondrosarcoma progression and may regulate PTHLH activity.
- Gene expression changes reflect altered cellular metabolism and proliferation during malignant progression.
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