Abstract
The differential proteomic approach (2D gel analysis coupled to MALDI-MS analysis) of nuclear proteins can provide an extremely useful tool to understand control of cell proliferation and differentiation. In order to identify possible markers of dedifferentiation between normal and cancerous thyroid cells, we used a differential proteomics approach by comparing nuclear extracts from the normal rat thyroid cell line FRTL-5 and the completely undifferentiated Ki-mol cell line, obtained by transformation with the Ki-ras oncogene. Galectin-3 (Gal-3) was identified as highly expressed, in the nuclear compartment, only in the transformed cell line. By using different human cancer cell lines, we showed that Gal-3 is maximally expressed in nuclei of papillary cancer cells. We focused on the functional relationship existing between Gal-3 and the thyroid-specific transcription factor TTF-1, whose expression is maintained in papillary cancer where it can contribute to the proliferating status. By using gel-retardation and transient tranfection assays, we demonstrate that Gal-3 upregulates the TTF-1 transcriptional activity. GST-pulldown experiments demonstrate the occurrence of interaction between Gal-3 and TTF-1 homeodomain. Since several lines of evidence suggest a role for Gal-3 in controlling proliferation and tumor progression in thyroid cancer, the stimulatory activity played by Gal-3 over TTF-1 would account for a possible molecular mechanism through which the galectin controls proliferation in thyroid cells.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 545-553 |
| Number of pages | 9 |
| Journal | Biochemical and Biophysical Research Communications |
| Volume | 302 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 14 2003 |
| Externally published | Yes |
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Keywords
- Differential proteomics
- Differentiation
- Galectin-3
- Thyroid
- Transcriptional regulation
- TTF-1
ASJC Scopus subject areas
- Biochemistry
- Biophysics
- Molecular Biology
Cite this
Nuclear localization of Galectin-3 in transformed thyroid cells : A role in transcriptional regulation. / Paron, Igor; Scaloni, Andrea; Pines, Alex; Bachi, Angela; Liu, Fu-Tong; Puppin, Cinzia; Pandolfi, Maura; Ledda, Luigi; Di Loreto, Carla; Damante, Giuseppe; Tell, Gianluca.
In: Biochemical and Biophysical Research Communications, Vol. 302, No. 3, 14.03.2003, p. 545-553.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Nuclear localization of Galectin-3 in transformed thyroid cells
T2 - A role in transcriptional regulation
AU - Paron, Igor
AU - Scaloni, Andrea
AU - Pines, Alex
AU - Bachi, Angela
AU - Liu, Fu-Tong
AU - Puppin, Cinzia
AU - Pandolfi, Maura
AU - Ledda, Luigi
AU - Di Loreto, Carla
AU - Damante, Giuseppe
AU - Tell, Gianluca
PY - 2003/3/14
Y1 - 2003/3/14
N2 - The differential proteomic approach (2D gel analysis coupled to MALDI-MS analysis) of nuclear proteins can provide an extremely useful tool to understand control of cell proliferation and differentiation. In order to identify possible markers of dedifferentiation between normal and cancerous thyroid cells, we used a differential proteomics approach by comparing nuclear extracts from the normal rat thyroid cell line FRTL-5 and the completely undifferentiated Ki-mol cell line, obtained by transformation with the Ki-ras oncogene. Galectin-3 (Gal-3) was identified as highly expressed, in the nuclear compartment, only in the transformed cell line. By using different human cancer cell lines, we showed that Gal-3 is maximally expressed in nuclei of papillary cancer cells. We focused on the functional relationship existing between Gal-3 and the thyroid-specific transcription factor TTF-1, whose expression is maintained in papillary cancer where it can contribute to the proliferating status. By using gel-retardation and transient tranfection assays, we demonstrate that Gal-3 upregulates the TTF-1 transcriptional activity. GST-pulldown experiments demonstrate the occurrence of interaction between Gal-3 and TTF-1 homeodomain. Since several lines of evidence suggest a role for Gal-3 in controlling proliferation and tumor progression in thyroid cancer, the stimulatory activity played by Gal-3 over TTF-1 would account for a possible molecular mechanism through which the galectin controls proliferation in thyroid cells.
AB - The differential proteomic approach (2D gel analysis coupled to MALDI-MS analysis) of nuclear proteins can provide an extremely useful tool to understand control of cell proliferation and differentiation. In order to identify possible markers of dedifferentiation between normal and cancerous thyroid cells, we used a differential proteomics approach by comparing nuclear extracts from the normal rat thyroid cell line FRTL-5 and the completely undifferentiated Ki-mol cell line, obtained by transformation with the Ki-ras oncogene. Galectin-3 (Gal-3) was identified as highly expressed, in the nuclear compartment, only in the transformed cell line. By using different human cancer cell lines, we showed that Gal-3 is maximally expressed in nuclei of papillary cancer cells. We focused on the functional relationship existing between Gal-3 and the thyroid-specific transcription factor TTF-1, whose expression is maintained in papillary cancer where it can contribute to the proliferating status. By using gel-retardation and transient tranfection assays, we demonstrate that Gal-3 upregulates the TTF-1 transcriptional activity. GST-pulldown experiments demonstrate the occurrence of interaction between Gal-3 and TTF-1 homeodomain. Since several lines of evidence suggest a role for Gal-3 in controlling proliferation and tumor progression in thyroid cancer, the stimulatory activity played by Gal-3 over TTF-1 would account for a possible molecular mechanism through which the galectin controls proliferation in thyroid cells.
KW - Differential proteomics
KW - Differentiation
KW - Galectin-3
KW - Thyroid
KW - Transcriptional regulation
KW - TTF-1
UR - http://www.scopus.com/inward/record.url?scp=0345701488&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0345701488&partnerID=8YFLogxK
U2 - 10.1016/S0006-291X(03)00151-7
DO - 10.1016/S0006-291X(03)00151-7
M3 - Article
VL - 302
SP - 545
EP - 553
JO - Biochemical and Biophysical Research Communications
JF - Biochemical and Biophysical Research Communications
SN - 0006-291X
IS - 3
ER -