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Cathepsin L antisense oligonucleotides in a human osteosarcoma cell line: effects on the invasive phenotype
S Krueger1, U Kellner, F Buehling
1Department of Pathology, Otto-von-Guericke University Magdeburg, Leipziger Strasse 44, 39120 Magdeburg, Germany. sabine.krueger@medizin.uni-magdeburg.de
Abstract:
Alterations in cathepsin L expression and trafficking have been associated with the progression and metastasis of several tumor entities. In the present study, we examined the effects of various cathepsin L antisense (as) phosphorothioate oligonucleotides on both the expression of cathepsin L and the invasive potential of the human osteosarcoma cell line MNNG/HOS. Seven oligonucleotides of 20-bp length each and one random control oligonucleotide were chosen to block cathepsin L expression. Northern blot analysis demonstrated a significant reduction in cathepsin L mRNA expression by the six antisense oligonucleotides at a concentration of 10 microM. Cathepsin L protein expression was reduced significantly (50-85%) by the antisense oligonucleotides, as compared with the controls. Adhesion to matrices of collagen I and matrigel was not affected. In in vitro motility and invasion assays performed in uncoated and precoated transwell chambers, the ability of cells to migrate through the filters was inhibited by 35-75% using antisense oligonucleotides. The random control did not show any inhibitory effect. These data demonstrate that in MNNG/HOS cells cathepsin L influences cellular malignancy by promoting migration and basement membrane degradation.
Insights
Antisense oligonucleotides targeting cathepsin L (CL) significantly reduced CL expression and inhibited the migration and invasion of human osteosarcoma cells. This suggests CL plays a key role in cancer cell malignancy.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Cathepsin L (CL) expression and trafficking are linked to cancer progression and metastasis.
- Understanding CL's role in osteosarcoma is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the impact of cathepsin L antisense oligonucleotides on osteosarcoma cell line MNNG/HOS.
- To evaluate the effect of reduced CL expression on cellular invasion and migration.
Main Methods:
- Utilized seven 20-bp antisense phosphorothioate oligonucleotides and one random control to inhibit CL expression.
- Assessed CL mRNA and protein levels via Northern blot analysis.
- Evaluated cell adhesion, in vitro motility, and invasion using transwell assays.
Main Results:
- Six antisense oligonucleotides significantly reduced cathepsin L mRNA and protein expression (50-85%) at 10 microM.
- Cell adhesion to collagen I and matrigel remained unaffected.
- Cell migration and invasion through transwell filters were inhibited by 35-75% with antisense oligonucleotides.
Conclusions:
- Cathepsin L plays a significant role in promoting migration and basement membrane degradation in MNNG/HOS osteosarcoma cells.
- Targeting cathepsin L expression with antisense oligonucleotides can inhibit the invasive potential of osteosarcoma cells.