Hematopoietic stem-cell gene therapy is associated with restored white matter microvascular function in cerebral...

Area of Science:

• Neuroscience
• Genetics
• Hematology

Background:

• Cerebral adrenoleukodystrophy (CALD) involves blood-brain barrier disruption and microvascular dysfunction.
• The exact mechanisms underlying CALD pathogenesis are not fully understood.
• Loss of ABCD1 gene function is the primary cause of CALD.

Purpose of the Study:

• To analyze cerebral perfusion imaging in boys with CALD treated with gene therapy.
• To assess the impact of ABCD1 gene therapy on white matter permeability and microvascular flow.
• To investigate the engraftment and long-term effects of corrected cells in the cerebral vasculature.

Main Methods:

• Analysis of cerebral perfusion imaging in boys with CALD.
• Treatment involved autologous hematopoietic stem cells transduced with the Lenti-D lentiviral vector (ABCD1 cDNA).
• Comparison with patients receiving allogeneic hematopoietic stem cell transplantation.

Main Results:

• Widespread and sustained normalization of white matter permeability and microvascular flow observed.
• Demonstrated engraftment of ABCD1 functional bone marrow-derived cells in the cerebral vascular and perivascular space.
• An inverse correlation between gene dosage and lesion growth suggests long-term remodeling by corrected cells.

Conclusions:

• Hematopoietic stem cell therapy with ABCD1 gene transfer can restore cerebral microvascular function in CALD.
• Corrected cells contribute to the remodeling of brain microvascular function.
• Further research is required to determine the long-term efficacy and durability of these therapeutic effects.