Potential Role of CD9 and Implication of Motility Process in Pathogenesis of TEL/ALM1-positive ALL Relapses (LAL TEL/ALM1 and CD9). (LAL TEL/ALM1)

May 22, 2023 updated by: Rennes University Hospital
Down regulation of CD9 in TEL/AML1-positive ALL is addressed in motility assays to explore its role in B-ALL pathogenesis and its potential implication in relapses (and prognosis).

Study Overview

Detailed Description

  1. Assess of the impact of CD9 expression level on motility assays (migration and adhesion) We have initiated motility assays (fibronectin adhesion experiments and CXCL12 chemoattracted migration tests with modified Boyden chamber technique) using the CD9 positive TEL/AML1-positive cell line REH and the CD9 negative cell line RAJI (wild or transfected with CD9 cDNA). Data will be analyzed in combination with blocking antibodies and chemical antagonist according to the level of CD9 (transcript and protein) and of CXCR4. Protein quantifications will be performed by flow cytometry and Western Blot. Interactions will be explored by confocal microscopy and biological pathways by immunoblot.

    Adhesion results will be validated on patient samples of B-ALL.

  2. Post-transcriptional regulation of CD9 in TEL/AML1-positive ALL To identify miRNAs that are potentially deregulated in TEL/AML1-positive acute lymphoblastic leukaemia and especially to screen for CD9 -targeted miRNAs, we will use a TaqMan ®MicroRNA Arrays approach allowing the simultaneous measurement of about 760 human miRNA.

Small RNA will be extracted from bone marrow samples of twenty childhood B-ALL to screen miRNAs which are differentially expressed between CD9-positive and CD9-negative ALL and further compared with miRNAs which were predicted to target CD9 in databases. Validation of the selection will be performed by single Q-PCR for selected miRNAs using a novel cohort of ten bone marrow samples. Transfection assays and luciferase assays will be further realized to confirm that the differential miRNAs really target and affect CD9 expression .

Study Type

Interventional

Enrollment (Actual)

51

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

      • Rennes, France, 35000
        • Rennes University Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

1 year to 18 years (Child, Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • patients > 1 year and ≤18 years
  • with B-ALL diagnosis
  • registered in Rennes for treatment
  • written informed consent signed by all patients or their parents or legal guardian

Exclusion Criteria:

  • Refusal to participate
  • Inherited cytogenetic abnormalities

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Other: CD9 expression level
Impact of CD9 expression level on motility assays

1) Assess of the impact of CD9 expression level on motility assays (migration and adhesion) We have initiated motility assays (fibronectin adhesion experiments and CXCL12 chemoattracted migration tests with modified Boyden chamber technique) using the CD9 positive TEL/AML1-positive cell line REH and the CD9 negative cell line RAJI (wild or transfected with CD9 cDNA). Data will be analyzed in combination with blocking antibodies and chemical antagonist according to the level of CD9 (transcript and protein) and of CXCR4. Protein quantifications will be performed by flow cytometry and Western Blot. Interactions will be explored by confocal microscopy and biological pathways by immunoblot.

Adhesion results will be validated on patient samples of B-ALL.

Other Names:
  • Not Apllicable

2) Post-transcriptional regulation of CD9 in TEL/AML1-positive ALL To identify miRNAs that are potentially deregulated in TEL/AML1-positive acute lymphoblastic leukaemia and especially to screen for CD9 -targeted miRNAs, we will use a TaqMan ®MicroRNA Arrays approach allowing the simultaneous measurement of about 760 human miRNA.

Small RNA will be extracted from bone marrow samples of twenty childhood B-ALL to screen miRNAs which are differentially expressed between CD9-positive and CD9-negative ALL and further compared with miRNAs which were predicted to target CD9 in databases. Validation of the selection will be performed by single Q-PCR for selected miRNAs using a novel cohort of ten bone marrow samples.

Other Names:
  • Not Apllicable

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
The potential discriminating state of CD9. - To determine the functional impact of CD9 on motility assays in TEL/AML1-positive blasts - To explore the regulation of the expression of the CD9 transcript inTEL/AML1-positive blasts
Time Frame: 3 years

Due to the importance of the motility process in malignant cells and the role of CD9 in cell motility regulation, we considered the potential discriminating state of CD9.

  • To determine the functional impact of CD9 on motility assays in TEL/AML1-positive blasts
  • To explore the regulation of the expression of the CD9 transcript inTEL/AML1-positive blasts
3 years

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
- Migratory potential of blasts according to CD9 expression
Time Frame: 3 years
- Migratory potential of blasts according to CD9 expression
3 years
- Adhesion properties of blasts according to CD9 expression
Time Frame: 3 years
- Adhesion properties of blasts according to CD9 expression
3 years
- Level of miRNA, that could affect CD9 transcript levels inTEL/AML1-positive blasts versus TEL/AML1-negative ones
Time Frame: 3 years
- Level of miRNA, that could affect CD9 transcript levels inTEL/AML1-positive blasts versus TEL/AML1-negative ones
3 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

November 1, 2010

Primary Completion (Actual)

October 11, 2018

Study Completion (Actual)

October 11, 2018

Study Registration Dates

First Submitted

January 24, 2011

First Submitted That Met QC Criteria

January 24, 2011

First Posted (Estimate)

January 25, 2011

Study Record Updates

Last Update Posted (Actual)

May 24, 2023

Last Update Submitted That Met QC Criteria

May 22, 2023

Last Verified

May 1, 2023

More Information

Terms related to this study

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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