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7 results on '"Borlase, Stephanie"'

1. A group 3 medulloblastoma stem cell program is maintained by OTX2-mediated alternative splicing

Author

Saulnier, Olivier, Zagozewski, Jamie, Liang, Lisa, Hendrikse, Liam D., Layug, Paul, Gordon, Victor, Aldinger, Kimberly A., Haldipur, Parthiv, Borlase, Stephanie, Coudière-Morrison, Ludivine, Cai, Ting, Martell, Emma, Gonzales, Naomi M., Palidwor, Gareth, Porter, Christopher J., Richard, Stéphane, Sharif, Tanveer, Millen, Kathleen J., Doble, Brad W., Taylor, Michael D., and Werbowetski-Ogilvie, Tamra E.

Published
2024
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2. Failure of human rhombic lip differentiation underlies medulloblastoma formation

Author

Hendrikse, Liam D, Haldipur, Parthiv, Saulnier, Olivier, Millman, Jake, Sjoboen, Alexandria H, Erickson, Anders W, Ong, Winnie, Gordon, Victor, Coudière-Morrison, Ludivine, Mercier, Audrey L, Shokouhian, Mohammad, Suárez, Raúl A, Ly, Michelle, Borlase, Stephanie, Scott, David S, Vladoiu, Maria C, Farooq, Hamza, Sirbu, Olga, Nakashima, Takuma, Nambu, Shohei, Funakoshi, Yusuke, Bahcheli, Alec, Diaz-Mejia, J Javier, Golser, Joseph, Bach, Kathleen, Phuong-Bao, Tram, Skowron, Patryk, Wang, Evan Y, Kumar, Sachin A, Balin, Polina, Visvanathan, Abhirami, Lee, John JY, Ayoub, Ramy, Chen, Xin, Chen, Xiaodi, Mungall, Karen L, Luu, Betty, Bérubé, Pierre, Wang, Yu C, Pfister, Stefan M, Kim, Seung-Ki, Delattre, Olivier, Bourdeaut, Franck, Doz, François, Masliah-Planchon, Julien, Grajkowska, Wieslawa A, Loukides, James, Dirks, Peter, Fèvre-Montange, Michelle, Jouvet, Anne, French, Pim J, Kros, Johan M, Zitterbart, Karel, Bailey, Swneke D, Eberhart, Charles G, Rao, Amulya AN, Giannini, Caterina, Olson, James M, Garami, Miklós, Hauser, Peter, Phillips, Joanna J, Ra, Young S, de Torres, Carmen, Mora, Jaume, Li, Kay KW, Ng, Ho-Keung, Poon, Wai S, Pollack, Ian F, López-Aguilar, Enrique, Gillespie, G Yancey, Van Meter, Timothy E, Shofuda, Tomoko, Vibhakar, Rajeev, Thompson, Reid C, Cooper, Michael K, Rubin, Joshua B, Kumabe, Toshihiro, Jung, Shin, Lach, Boleslaw, Iolascon, Achille, Ferrucci, Veronica, de Antonellis, Pasqualino, Zollo, Massimo, Cinalli, Giuseppe, Robinson, Shenandoah, Stearns, Duncan S, Van Meir, Erwin G, Porrati, Paola, Finocchiaro, Gaetano, Massimino, Maura, Carlotti, Carlos G, Faria, Claudia C, Roussel, Martine F, Boop, Frederick, Chan, Jennifer A, Aldinger, Kimberly A, Razavi, Ferechte, Silvestri, Evelina, McLendon, Roger E, and Thompson, Eric M

Subjects
Stem Cell Research, Brain Disorders, Neurosciences, Rare Diseases, Stem Cell Research - Nonembryonic - Non-Human, Aetiology, 1.1 Normal biological development and functioning, Underpinning research, 2.1 Biological and endogenous factors, Cell Differentiation, Cell Lineage, Cerebellar Neoplasms, Cerebellum, Core Binding Factor alpha Subunits, Hedgehog Proteins, Histone Demethylases, Humans, Ki-67 Antigen, Medulloblastoma, Metencephalon, Muscle Proteins, Mutation, Otx Transcription Factors, Repressor Proteins, T-Box Domain Proteins, Transcription Factors, General Science & Technology
Abstract

Medulloblastoma (MB) comprises a group of heterogeneous paediatric embryonal neoplasms of the hindbrain with strong links to early development of the hindbrain1-4. Mutations that activate Sonic hedgehog signalling lead to Sonic hedgehog MB in the upper rhombic lip (RL) granule cell lineage5-8. By contrast, mutations that activate WNT signalling lead to WNT MB in the lower RL9,10. However, little is known about the more commonly occurring group 4 (G4) MB, which is thought to arise in the unipolar brush cell lineage3,4. Here we demonstrate that somatic mutations that cause G4 MB converge on the core binding factor alpha (CBFA) complex and mutually exclusive alterations that affect CBFA2T2, CBFA2T3, PRDM6, UTX and OTX2. CBFA2T2 is expressed early in the progenitor cells of the cerebellar RL subventricular zone in Homo sapiens, and G4 MB transcriptionally resembles these progenitors but are stalled in developmental time. Knockdown of OTX2 in model systems relieves this differentiation blockade, which allows MB cells to spontaneously proceed along normal developmental differentiation trajectories. The specific nature of the split human RL, which is destined to generate most of the neurons in the human brain, and its high level of susceptible EOMES+KI67+ unipolar brush cell progenitor cells probably predisposes our species to the development of G4 MB.

Published
2022

5. Combined MEK and JAK/STAT3 pathway inhibition effectively decreases SHH medulloblastoma tumor progression

Author

Zagozewski, Jamie, Borlase, Stephanie, Guppy, Brent J., Coudière-Morrison, Ludivine, Shahriary, Ghazaleh M., Gordon, Victor, Liang, Lisa, Cheng, Stephen, Porter, Christopher J., Kelley, Rhonda, Hawkins, Cynthia, Chan, Jennifer A., Liang, Yan, Gong, Jingjing, Nör, Carolina, Saulnier, Olivier, Wechsler-Reya, Robert J., Ramaswamy, Vijay, and Werbowetski-Ogilvie, Tamra E.

Published
2022
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6. Author Correction: Failure of human rhombic lip differentiation underlies medulloblastoma formation

Author

Hendrikse, Liam D., Haldipur, Parthiv, Saulnier, Olivier, Millman, Jake, Sjoboen, Alexandria H., Erickson, Anders W., Ong, Winnie, Gordon, Victor, Coudière-Morrison, Ludivine, Mercier, Audrey L., Shokouhian, Mohammad, Suárez, Raúl A., Ly, Michelle, Borlase, Stephanie, Scott, David S., Vladoiu, Maria C., Farooq, Hamza, Sirbu, Olga, Nakashima, Takuma, Nambu, Shohei, Funakoshi, Yusuke, Bahcheli, Alec, Diaz-Mejia, J. Javier, Golser, Joseph, Bach, Kathleen, Phuong-Bao, Tram, Skowron, Patryk, Wang, Evan Y., Kumar, Sachin A., Balin, Polina, Visvanathan, Abhirami, Lee, John J. Y., Ayoub, Ramy, Chen, Xin, Chen, Xiaodi, Mungall, Karen L., Luu, Betty, Bérubé, Pierre, Wang, Yu C., Pfister, Stefan M., Kim, Seung-Ki, Delattre, Olivier, Bourdeaut, Franck, Doz, François, Masliah-Planchon, Julien, Grajkowska, Wieslawa A., Loukides, James, Dirks, Peter, Fèvre-Montange, Michelle, Jouvet, Anne, French, Pim J., Kros, Johan M., Zitterbart, Karel, Bailey, Swneke D., Eberhart, Charles G., Rao, Amulya A. N., Giannini, Caterina, Olson, James M., Garami, Miklós, Hauser, Peter, Phillips, Joanna J., Ra, Young S., de Torres, Carmen, Mora, Jaume, Li, Kay K. W., Ng, Ho-Keung, Poon, Wai S., Pollack, Ian F., López-Aguilar, Enrique, Gillespie, G. Yancey, Van Meter, Timothy E., Shofuda, Tomoko, Vibhakar, Rajeev, Thompson, Reid C., Cooper, Michael K., Rubin, Joshua B., Kumabe, Toshihiro, Jung, Shin, Lach, Boleslaw, Iolascon, Achille, Ferrucci, Veronica, de Antonellis, Pasqualino, Zollo, Massimo, Cinalli, Giuseppe, Robinson, Shenandoah, Stearns, Duncan S., Van Meir, Erwin G., Porrati, Paola, Finocchiaro, Gaetano, Massimino, Maura, Carlotti, Carlos G., Faria, Claudia C., Roussel, Martine F., Boop, Frederick, Chan, Jennifer A., Aldinger, Kimberly A., Razavi, Ferechte, Silvestri, Evelina, McLendon, Roger E., Thompson, Eric M., Ansari, Marc, Garre, Maria L., Chico, Fernando, Eguía, Pilar, Pérezpeña, Mario, Morrissy, A. Sorana, Cavalli, Florence M. G., Wu, Xiaochong, Daniels, Craig, Rich, Jeremy N., Jones, Steven J. M., Moore, Richard A., Marra, Marco A., Huang, Xi, Reimand, Jüri, Sorensen, Poul H., Wechsler-Reya, Robert J., Weiss, William A., Pugh, Trevor J., Garzia, Livia, Kleinman, Claudia L., Stein, Lincoln D., Jabado, Nada, Malkin, David, Ayrault, Olivier, Golden, Jeffrey A., Ellison, David W., Doble, Brad, Ramaswamy, Vijay, Werbowetski-Ogilvie, Tamra E., Suzuki, Hiromichi, Millen, Kathleen J., and Taylor, Michael D.

Published
2022
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7. Exploring new targeted therapies for Sonic Hedgehog (SHH) medulloblastoma

Author

Doble, Brad (Pediatrics and Child Health), Drögemöller, Britt (Biochemistry and Medical Genetics), Werbowetski-Ogilvie, Tamra, Borlase, Stephanie, Doble, Brad (Pediatrics and Child Health), Drögemöller, Britt (Biochemistry and Medical Genetics), Werbowetski-Ogilvie, Tamra, and Borlase, Stephanie

Abstract

Medulloblastoma (MB) is the most common malignant primary pediatric brain tumor and is currently divided into 4 molecular subgroups that exhibit different genomic alterations, gene expression profiles and response to treatment. We have previously shown a novel role for the MEK/MAPK pathway in specifically contributing to Sonic Hedgehog (SHH) MB tumor progression. Here, we compared the effect of the MEK inhibitor (MEKi) selumetinib to the more potent MEKi trametinib on tumor cell properties in vitro and assessed the effect of trametinib in 3 orthotopic MB xenograft models in vivo. Trametinib significantly reduced tumorsphere size, stem/progenitor cell proliferation and viability at much lower concentrations than selumetinib. RNA sequencing corroborated these findings with significant decreases in cell cycle and stem cell pathways concomitant with increases in pathways associated with cell differentiation and ciliopathies following MEKi treatment. Importantly, trametinib also decreased tumor growth and increased survival in vivo and this was accompanied by similar decreases in cell cycle related pathways as well as increases in IL6/JAK STAT3 signaling. Our study reveals a novel role for trametinib in effectively attenuating MB tumor progression and warrants further investigation of this potent MEK1/2 inhibitor either alone or in combination with other targeted therapies for the treatment of SHH MB.

Published
2022

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