CD312 Promotes Paediatric Acute Lymphoblastic Leukaemia Through GNA15-Mediated Non-Classical GPCR Signalling Pathway

Area of Science:

• Immunology
• Oncology
• Molecular Biology

Background:

• The bone marrow immune microenvironment is critical in leukaemia pathogenesis.
• Understanding immune cell dynamics in childhood acute lymphoblastic leukaemia (ALL) is essential for developing effective treatments.

Purpose of the Study:

• To investigate the role of the immune microenvironment in paediatric ALL.
• To identify key molecular targets, specifically within the GPCR database, influencing ALL progression.

Main Methods:

• High-throughput screening of the GPCR database in childhood ALL immune microenvironments.
• CD312 knockdown experiments to assess immune cell distribution (Treg, CTL).
• Co-culture systems and BrdU staining assays to evaluate leukaemia cell proliferation and signalling pathways (ERK, JNK, p38) involving CD312 and GNA15.

Main Results:

• CD312 was identified as a critical target in the paediatric ALL immune microenvironment.
• CD312 knockdown altered Treg and CTL cell proportions, reducing suppressive Treg cells and increasing cytotoxic CTL cells.
• CD312 interacts with GNA15, influencing leukaemia cell proliferation via the ERK, JNK, and p38 signalling pathways.

Conclusions:

• CD312 promotes a suppressive immune microenvironment in paediatric ALL.
• The CD312-GNA15 interaction, mediated by a non-classical GPCR pathway, drives leukaemia progression.
• CD312 represents a potential therapeutic target for childhood ALL.