author_facet Bolin, Sara
Savov, Vasil
Borgenvik, Anna
Rosen, Gabriela
Garancher, Alexandra
Rahmanto, Aldwin Suryo
Hutter, Sonja
Mainwaring, Oliver
Olausson, Karl Holmberg
Rusert, Jessica
Sundstrom, Anders
Richardson, Stacey
Fotaki, Grammatiki
Hill, Rebecca
Dubuc, Adrian
Kalushkova, Antonia
Remke, Marc
Cancer, Matko
Jernberg-Wiklund, Helena
Ramaswamy, Vijay
Taylor, Michael
Sangfelt, Olle
Clifford, Steven
Schuller, Ulrich
Wechsler-Reya, Robert
Weishaupt, Holger
Swartling, Fredrik
Bolin, Sara
Savov, Vasil
Borgenvik, Anna
Rosen, Gabriela
Garancher, Alexandra
Rahmanto, Aldwin Suryo
Hutter, Sonja
Mainwaring, Oliver
Olausson, Karl Holmberg
Rusert, Jessica
Sundstrom, Anders
Richardson, Stacey
Fotaki, Grammatiki
Hill, Rebecca
Dubuc, Adrian
Kalushkova, Antonia
Remke, Marc
Cancer, Matko
Jernberg-Wiklund, Helena
Ramaswamy, Vijay
Taylor, Michael
Sangfelt, Olle
Clifford, Steven
Schuller, Ulrich
Wechsler-Reya, Robert
Weishaupt, Holger
Swartling, Fredrik
author Bolin, Sara
Savov, Vasil
Borgenvik, Anna
Rosen, Gabriela
Garancher, Alexandra
Rahmanto, Aldwin Suryo
Hutter, Sonja
Mainwaring, Oliver
Olausson, Karl Holmberg
Rusert, Jessica
Sundstrom, Anders
Richardson, Stacey
Fotaki, Grammatiki
Hill, Rebecca
Dubuc, Adrian
Kalushkova, Antonia
Remke, Marc
Cancer, Matko
Jernberg-Wiklund, Helena
Ramaswamy, Vijay
Taylor, Michael
Sangfelt, Olle
Clifford, Steven
Schuller, Ulrich
Wechsler-Reya, Robert
Weishaupt, Holger
Swartling, Fredrik
spellingShingle Bolin, Sara
Savov, Vasil
Borgenvik, Anna
Rosen, Gabriela
Garancher, Alexandra
Rahmanto, Aldwin Suryo
Hutter, Sonja
Mainwaring, Oliver
Olausson, Karl Holmberg
Rusert, Jessica
Sundstrom, Anders
Richardson, Stacey
Fotaki, Grammatiki
Hill, Rebecca
Dubuc, Adrian
Kalushkova, Antonia
Remke, Marc
Cancer, Matko
Jernberg-Wiklund, Helena
Ramaswamy, Vijay
Taylor, Michael
Sangfelt, Olle
Clifford, Steven
Schuller, Ulrich
Wechsler-Reya, Robert
Weishaupt, Holger
Swartling, Fredrik
Neuro-Oncology
MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
Cancer Research
Neurology (clinical)
Oncology
author_sort bolin, sara
spelling Bolin, Sara Savov, Vasil Borgenvik, Anna Rosen, Gabriela Garancher, Alexandra Rahmanto, Aldwin Suryo Hutter, Sonja Mainwaring, Oliver Olausson, Karl Holmberg Rusert, Jessica Sundstrom, Anders Richardson, Stacey Fotaki, Grammatiki Hill, Rebecca Dubuc, Adrian Kalushkova, Antonia Remke, Marc Cancer, Matko Jernberg-Wiklund, Helena Ramaswamy, Vijay Taylor, Michael Sangfelt, Olle Clifford, Steven Schuller, Ulrich Wechsler-Reya, Robert Weishaupt, Holger Swartling, Fredrik 1522-8517 1523-5866 Oxford University Press (OUP) Cancer Research Neurology (clinical) Oncology http://dx.doi.org/10.1093/neuonc/noz036.185 <jats:title>Abstract</jats:title> <jats:p>Tumor recurrence is the leading cause of death among children with medulloblastoma, the most common type of malignant pediatric brain tumors. The mechanisms behind medulloblastoma recurrence are not fully understood. We previously showed that the transcription factor SOX9 promotes cisplatin treatment resistance in medulloblastoma. Here we show that SOX9 levels correlate with poor prognosis in Group 3 tumors. By studying paired primary-recurrent medulloblastoma samples and patient-derived xenograft (PDX) models we further identified rare SOX9-positive slow-cycling, therapy-resistant tumor cells that accumulate in relapses and in leptomenigeal metastases of Group 3 and Group 4 patients. By using an inducible Tet-OFF transgenic (GTML) mouse model for malignant MYCN-driven Group 3 tumors we identified rare SOX9-positive, quiescent brain tumor cells that are more resistant to cisplatin. Dox treatment normally cures GTML transgenic animals that developed aggressive medulloblastoma by turning MYCN off. However, when crossing the Tet-OFF GTML model with a Tet-ON rtTA-Sox9 model we can redirect MYCN expression to the Sox9 promoter ultimately driving brain tumor recurrence from rare SOX9-positive cells with 100% penetrance. In this novel animal model, recurrent tumors were actively disseminating from the hindbrain to the spinal cord and into the forebrain similar to distant relapses found in patients. By overexpressing SOX9 in human Group 3 tumor cells, MYC was directly inhibited and cell proliferation was decreased. PDX models of Group 3 tumors further showed increased levels of SOX9-positivity and less proliferative cells in metastatic compartments. Expression profiling revealed that recurrences were more inflammatory, metastatic, immune evasive and showed elevated MGMT methyltransferase levels which depleted recurrent cells and sensitized them for chemotherapy when using the MGMT inhibitor lomeguatrib. To summarize, our data clarify important and complex mechanisms by which latent medulloblastoma cells fail to respond to standard therapy and generate relapses.</jats:p> MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE Neuro-Oncology
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title MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_unstemmed MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_full MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_fullStr MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_full_unstemmed MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_short MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_sort medu-26. latent sox9-positive cells responsible for myc-driven medulloblastoma recurrence
topic Cancer Research
Neurology (clinical)
Oncology
url http://dx.doi.org/10.1093/neuonc/noz036.185
publishDate 2019
physical ii108-ii109
description <jats:title>Abstract</jats:title> <jats:p>Tumor recurrence is the leading cause of death among children with medulloblastoma, the most common type of malignant pediatric brain tumors. The mechanisms behind medulloblastoma recurrence are not fully understood. We previously showed that the transcription factor SOX9 promotes cisplatin treatment resistance in medulloblastoma. Here we show that SOX9 levels correlate with poor prognosis in Group 3 tumors. By studying paired primary-recurrent medulloblastoma samples and patient-derived xenograft (PDX) models we further identified rare SOX9-positive slow-cycling, therapy-resistant tumor cells that accumulate in relapses and in leptomenigeal metastases of Group 3 and Group 4 patients. By using an inducible Tet-OFF transgenic (GTML) mouse model for malignant MYCN-driven Group 3 tumors we identified rare SOX9-positive, quiescent brain tumor cells that are more resistant to cisplatin. Dox treatment normally cures GTML transgenic animals that developed aggressive medulloblastoma by turning MYCN off. However, when crossing the Tet-OFF GTML model with a Tet-ON rtTA-Sox9 model we can redirect MYCN expression to the Sox9 promoter ultimately driving brain tumor recurrence from rare SOX9-positive cells with 100% penetrance. In this novel animal model, recurrent tumors were actively disseminating from the hindbrain to the spinal cord and into the forebrain similar to distant relapses found in patients. By overexpressing SOX9 in human Group 3 tumor cells, MYC was directly inhibited and cell proliferation was decreased. PDX models of Group 3 tumors further showed increased levels of SOX9-positivity and less proliferative cells in metastatic compartments. Expression profiling revealed that recurrences were more inflammatory, metastatic, immune evasive and showed elevated MGMT methyltransferase levels which depleted recurrent cells and sensitized them for chemotherapy when using the MGMT inhibitor lomeguatrib. To summarize, our data clarify important and complex mechanisms by which latent medulloblastoma cells fail to respond to standard therapy and generate relapses.</jats:p>
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author Bolin, Sara, Savov, Vasil, Borgenvik, Anna, Rosen, Gabriela, Garancher, Alexandra, Rahmanto, Aldwin Suryo, Hutter, Sonja, Mainwaring, Oliver, Olausson, Karl Holmberg, Rusert, Jessica, Sundstrom, Anders, Richardson, Stacey, Fotaki, Grammatiki, Hill, Rebecca, Dubuc, Adrian, Kalushkova, Antonia, Remke, Marc, Cancer, Matko, Jernberg-Wiklund, Helena, Ramaswamy, Vijay, Taylor, Michael, Sangfelt, Olle, Clifford, Steven, Schuller, Ulrich, Wechsler-Reya, Robert, Weishaupt, Holger, Swartling, Fredrik
author_facet Bolin, Sara, Savov, Vasil, Borgenvik, Anna, Rosen, Gabriela, Garancher, Alexandra, Rahmanto, Aldwin Suryo, Hutter, Sonja, Mainwaring, Oliver, Olausson, Karl Holmberg, Rusert, Jessica, Sundstrom, Anders, Richardson, Stacey, Fotaki, Grammatiki, Hill, Rebecca, Dubuc, Adrian, Kalushkova, Antonia, Remke, Marc, Cancer, Matko, Jernberg-Wiklund, Helena, Ramaswamy, Vijay, Taylor, Michael, Sangfelt, Olle, Clifford, Steven, Schuller, Ulrich, Wechsler-Reya, Robert, Weishaupt, Holger, Swartling, Fredrik, Bolin, Sara, Savov, Vasil, Borgenvik, Anna, Rosen, Gabriela, Garancher, Alexandra, Rahmanto, Aldwin Suryo, Hutter, Sonja, Mainwaring, Oliver, Olausson, Karl Holmberg, Rusert, Jessica, Sundstrom, Anders, Richardson, Stacey, Fotaki, Grammatiki, Hill, Rebecca, Dubuc, Adrian, Kalushkova, Antonia, Remke, Marc, Cancer, Matko, Jernberg-Wiklund, Helena, Ramaswamy, Vijay, Taylor, Michael, Sangfelt, Olle, Clifford, Steven, Schuller, Ulrich, Wechsler-Reya, Robert, Weishaupt, Holger, Swartling, Fredrik
author_sort bolin, sara
container_issue Supplement_2
container_start_page 0
container_title Neuro-Oncology
container_volume 21
description <jats:title>Abstract</jats:title> <jats:p>Tumor recurrence is the leading cause of death among children with medulloblastoma, the most common type of malignant pediatric brain tumors. The mechanisms behind medulloblastoma recurrence are not fully understood. We previously showed that the transcription factor SOX9 promotes cisplatin treatment resistance in medulloblastoma. Here we show that SOX9 levels correlate with poor prognosis in Group 3 tumors. By studying paired primary-recurrent medulloblastoma samples and patient-derived xenograft (PDX) models we further identified rare SOX9-positive slow-cycling, therapy-resistant tumor cells that accumulate in relapses and in leptomenigeal metastases of Group 3 and Group 4 patients. By using an inducible Tet-OFF transgenic (GTML) mouse model for malignant MYCN-driven Group 3 tumors we identified rare SOX9-positive, quiescent brain tumor cells that are more resistant to cisplatin. Dox treatment normally cures GTML transgenic animals that developed aggressive medulloblastoma by turning MYCN off. However, when crossing the Tet-OFF GTML model with a Tet-ON rtTA-Sox9 model we can redirect MYCN expression to the Sox9 promoter ultimately driving brain tumor recurrence from rare SOX9-positive cells with 100% penetrance. In this novel animal model, recurrent tumors were actively disseminating from the hindbrain to the spinal cord and into the forebrain similar to distant relapses found in patients. By overexpressing SOX9 in human Group 3 tumor cells, MYC was directly inhibited and cell proliferation was decreased. PDX models of Group 3 tumors further showed increased levels of SOX9-positivity and less proliferative cells in metastatic compartments. Expression profiling revealed that recurrences were more inflammatory, metastatic, immune evasive and showed elevated MGMT methyltransferase levels which depleted recurrent cells and sensitized them for chemotherapy when using the MGMT inhibitor lomeguatrib. To summarize, our data clarify important and complex mechanisms by which latent medulloblastoma cells fail to respond to standard therapy and generate relapses.</jats:p>
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spelling Bolin, Sara Savov, Vasil Borgenvik, Anna Rosen, Gabriela Garancher, Alexandra Rahmanto, Aldwin Suryo Hutter, Sonja Mainwaring, Oliver Olausson, Karl Holmberg Rusert, Jessica Sundstrom, Anders Richardson, Stacey Fotaki, Grammatiki Hill, Rebecca Dubuc, Adrian Kalushkova, Antonia Remke, Marc Cancer, Matko Jernberg-Wiklund, Helena Ramaswamy, Vijay Taylor, Michael Sangfelt, Olle Clifford, Steven Schuller, Ulrich Wechsler-Reya, Robert Weishaupt, Holger Swartling, Fredrik 1522-8517 1523-5866 Oxford University Press (OUP) Cancer Research Neurology (clinical) Oncology http://dx.doi.org/10.1093/neuonc/noz036.185 <jats:title>Abstract</jats:title> <jats:p>Tumor recurrence is the leading cause of death among children with medulloblastoma, the most common type of malignant pediatric brain tumors. The mechanisms behind medulloblastoma recurrence are not fully understood. We previously showed that the transcription factor SOX9 promotes cisplatin treatment resistance in medulloblastoma. Here we show that SOX9 levels correlate with poor prognosis in Group 3 tumors. By studying paired primary-recurrent medulloblastoma samples and patient-derived xenograft (PDX) models we further identified rare SOX9-positive slow-cycling, therapy-resistant tumor cells that accumulate in relapses and in leptomenigeal metastases of Group 3 and Group 4 patients. By using an inducible Tet-OFF transgenic (GTML) mouse model for malignant MYCN-driven Group 3 tumors we identified rare SOX9-positive, quiescent brain tumor cells that are more resistant to cisplatin. Dox treatment normally cures GTML transgenic animals that developed aggressive medulloblastoma by turning MYCN off. However, when crossing the Tet-OFF GTML model with a Tet-ON rtTA-Sox9 model we can redirect MYCN expression to the Sox9 promoter ultimately driving brain tumor recurrence from rare SOX9-positive cells with 100% penetrance. In this novel animal model, recurrent tumors were actively disseminating from the hindbrain to the spinal cord and into the forebrain similar to distant relapses found in patients. By overexpressing SOX9 in human Group 3 tumor cells, MYC was directly inhibited and cell proliferation was decreased. PDX models of Group 3 tumors further showed increased levels of SOX9-positivity and less proliferative cells in metastatic compartments. Expression profiling revealed that recurrences were more inflammatory, metastatic, immune evasive and showed elevated MGMT methyltransferase levels which depleted recurrent cells and sensitized them for chemotherapy when using the MGMT inhibitor lomeguatrib. To summarize, our data clarify important and complex mechanisms by which latent medulloblastoma cells fail to respond to standard therapy and generate relapses.</jats:p> MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE Neuro-Oncology
spellingShingle Bolin, Sara, Savov, Vasil, Borgenvik, Anna, Rosen, Gabriela, Garancher, Alexandra, Rahmanto, Aldwin Suryo, Hutter, Sonja, Mainwaring, Oliver, Olausson, Karl Holmberg, Rusert, Jessica, Sundstrom, Anders, Richardson, Stacey, Fotaki, Grammatiki, Hill, Rebecca, Dubuc, Adrian, Kalushkova, Antonia, Remke, Marc, Cancer, Matko, Jernberg-Wiklund, Helena, Ramaswamy, Vijay, Taylor, Michael, Sangfelt, Olle, Clifford, Steven, Schuller, Ulrich, Wechsler-Reya, Robert, Weishaupt, Holger, Swartling, Fredrik, Neuro-Oncology, MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE, Cancer Research, Neurology (clinical), Oncology
title MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_full MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_fullStr MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_full_unstemmed MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_short MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
title_sort medu-26. latent sox9-positive cells responsible for myc-driven medulloblastoma recurrence
title_unstemmed MEDU-26. LATENT SOX9-POSITIVE CELLS RESPONSIBLE FOR MYC-DRIVEN MEDULLOBLASTOMA RECURRENCE
topic Cancer Research, Neurology (clinical), Oncology
url http://dx.doi.org/10.1093/neuonc/noz036.185