Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

The Role of Glycosyltransferases in the Oncogenesis of Neuroblastoma

This study has been completed.
Information provided by:
National Taiwan University Hospital Identifier:
First received: January 27, 2010
Last updated: NA
Last verified: January 2010
History: No changes posted

Neuroblastoma (NB) is the most common malignant tumor of infancy. Approximately 60% of NB patients are clinically diagnosed as the stage IV disease and have a very poor prognosis with a 5-year survival rate of no more than 30%. The mechanism underlying the tumorigenesis of NB remains largely unclear. It has been suggested that the pathogenesis of NB is due to a failure of differentiation or apoptosis of the embryonic NB cells.

Well-regulated glycosylation is essential for the normal development of the nervous system. Altered expression of glycosyltransferases with resulting dysregulated glycosylation of neuroblastic cells might lead to the development of NB. The β1,4-N-acetylgalactosaminyltransferase III (B4GALNT3) exhibits GalNAc transferase activity to form the GalNAcβ1,4GlcNAc (LacdiNAc or LDN) structure. The Drosophila B4GALNTA, homolog of human B4GALNT3, has been suggested to regulate the neuronal development. By immunohistochemical studies, we demonstrated that the expression of B4GALNT3 correlated well with histological grade of differentiation in 87 NB tumor samples. In addition, positive B4GALNT3 expression predicted a favorable patient's outcome. These evidences suggest that the regulation of glycosyltransferases is critical for the development of NB.

To further explore the role of glycosyltransferases in the differentiation and development of NB, we propose a 3-year project with the following 3 major aims:

Aim Ⅰ: Clarifying the effects of B4GALNT3 on NB cell behavior in vitro and in vivo. For further understanding the effects of B4GALNT3 on NB cells, NB cells with stable overexpression of B4GALNT3 are to be selected. Then NB cell phenotype and behavior changes after overexpression of B4GALNT3 are evaluated by in vitro assays as well as by a nude mice xenograft model. In addition, the expression of B4GALNT3 will be suppressed by siRNA, then the response of NB cells to ATRA-induced differentiation is evaluated.

Aim Ⅱ: Clarifying the target proteins glycosylated by B4GALNT3 as well as their associated downstream pathways in vitro and in vivo. The possible proteins glycosylated by B4GALNT3 are evaluated by comparing differential protein expressions between B4GALNT3-transfected and mock-transfected NB cells using proteomics analysis. NB tumor samples with low and high B4GALNT3 expression levels are also subjected to proteomics analysis to explore the possible target proteins glycosylated by B4GALNT3 in vivo. After identifying the target proteins modified by B4GALNT3, the downstream pathways to affect NB cell differentiation will also be evaluated.

Aim Ⅲ: Clarifying whether B4GALNT4, a family member of B4GALNT, plays a similar role as B4GALNT3, as well as how the expression of these enzymes are controlled epigenetically in human NB cell lines and tumor samples. The expression levels of B4GALNT4 in human NB samples are evaluated by RT-PCR and immunohistochemistry. The methylation status of the promoter sites of both B4GALNT3 and B4GALNT4 are examined in various NB cell lines as well tumor samples. Furthermore, NB tumor samples exhibiting high and low B4GALNT levels are subjected to microRNA array.

Altogether, our studies will not only establish the functional role of the family of glycosyltransferases in the cell behavior of NB, but also illustrate how the expression of glycosyltransferases are regulated epigenetically and how the glycosyltransferases affect NB cell behavior. Therefore, our results might shed light to the oncogenesis of NB as well as target therapy of NB.


Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Retrospective
Official Title: The Role of Glycosyltransferases in the Oncogenesis of Neuroblastoma

Resource links provided by NLM:

Further study details as provided by National Taiwan University Hospital:

Study Start Date: January 2008
Study Completion Date: April 2009
Primary Completion Date: February 2008 (Final data collection date for primary outcome measure)

Ages Eligible for Study:   up to 18 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
From year 1990 to 2008, pediatric neuroblastoma patients treated at National University Hospital, Taiwan

Inclusion Criteria:

  • Neuroblastoma patients with complete follow-up and sufficient samples for study

Exclusion Criteria:

  • Neuroblastoma patients without complete follow-up or sufficient samples for study
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01058798

Sponsors and Collaborators
National Taiwan University Hospital
Study Director: Wen-Ming Hsu, M.D., Ph.D. National Taiwan University Hospital
  More Information

Responsible Party: Wen-Ming Hsu, National Taiwan University Hospital Identifier: NCT01058798     History of Changes
Other Study ID Numbers: 200903079R
Study First Received: January 27, 2010
Last Updated: January 27, 2010

Keywords provided by National Taiwan University Hospital:

Additional relevant MeSH terms:
Neuroectodermal Tumors, Primitive, Peripheral
Neuroectodermal Tumors, Primitive
Neoplasms, Neuroepithelial
Neuroectodermal Tumors
Neoplasms, Germ Cell and Embryonal
Neoplasms by Histologic Type
Neoplasms, Glandular and Epithelial
Neoplasms, Nerve Tissue
Neoplastic Processes
Pathologic Processes processed this record on April 28, 2017