1 / 13

TGF- β receptor 1

TGF- β receptor 1. Anshul Badhwar. Transforming Growth Factor β - receptor type I / ALK5. Serine/Threonine kinase receptor. Transforming Growth Factor β - receptor type I. Serine/Threonine kinase receptor . Involved in both tumor suppression and promotion.

octavia-mccall
Download Presentation

TGF- β receptor 1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TGF-β receptor 1 Anshul Badhwar

  2. Transforming Growth Factorβ - receptor type I / ALK5 • Serine/Threonine kinase receptor.

  3. Transforming Growth Factorβ - receptor type I • Serine/Threonine kinase receptor. • Involved in both tumor suppression and promotion.

  4. Transforming Growth Factorβ - receptor type I • Serine/Threonine kinase receptor. • Involved in both tumor suppression and promotion. • Normal role in tissue regeneration, cell differentiation, embryonic development, growth inhibition and cell migration.

  5. TGF- β Signal Transduction Pasche et. al

  6. Knocking out the TGF- β Receptor Larsson et. al 2001

  7. Knocking out the TGF- β Receptor • Genotyping by PCR will produce a 350bp if TGF- β Receptor gene has been knocked out. • If exon 3 has not been knocked out a 150bp band will show up.

  8. TGF- β Knockout Mice • TGF- β-/- • Embryonic Lethal at Day 10.5 • Abnormal Vascular Development • Reduced Fibronectin Production (in vitro) • Insensitive to TGF- β growth inhibition. (in vitro) • Unresponsive to anti-migratory signals of TGF- β(in vitro) • TGF- β+/- • Development and phenotype same as wildtype

  9. Insensitivity to Growth Suppresion • T3M4 Human Pancreatic Cell lines showed no response to TGF-Beta growth suppression • Interestingly enough, sequencing analysis indicated that T3M4 cells do not harbor mutations in the TGFβ GRI or Smad4 genes.

  10. Transfection of TGF-β receptor • Suprisingly enough cells became responsive to TGF- β and underwent growth inhibition similar to wild type.

  11. Connection to Human Cancers • In Vivo many human pancreatic cancers express low levels of the TGF-beta receptor. • 5% of all pancreatic tumors have the TGF-beta receptor mutated in some form. • In Vitro many human pancreatic are often resistant to growth inhibition by the TGF-beta. • TGF-βRI (ALK5) expression is decreased in a prostate, pancreatic and colon cancer cells.

  12. Pancreatic Cancer • Pancreatic cancer incredibly hard to treat • Symptoms show up very late • 99% fatality rate when diagnosed

  13. References • Baldwin, R. L., Friess, H., Yokoyama, M., Lopez, M. E., Kobrin, M. S., Büchler, M. W. and Korc, M., Attenuated ALK5 receptor expression in human pancreatic cancer: correlation with resistance to growth inhibition. Int. J. Cancer , 67, 283-288 (1996). • Larrsson J., Goumans M.J., Sjostrand L.J., Rooijen M.A., Ward D., Leveen P., Xu X., Dijke P., Mummery C., Karlsson S., Abnormal angiogenesis but intact hematopoietic potential in TGF- β type I receptor-deficient mice, EMBO, 20, 1663-1673 (2001). • Steiner, M. S. and Barrack, E. R., Transforming growth factor- overproduction in prostate cancer: effects on growth in vivo and in vitro. Mol. Endocrinol. , 6, 15-25 (1992). • Wagner M.,Kleeff J, Lopez M.E., Bockman I., Massaqué J., Korc M., Transfection of the type I TGF- β receptor restores TGF- β responsiveness in pancreatic cancer. Int. J. Cancer , 78, 255-260 (1998)

More Related