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Presenilin-dependent gamma-secretase activity modulates thymocyte development.

P Doerfler¹, M S Shearman, R M Perlmutter

¹Department of Immunology and Rheumatology, Merck Research Laboratories, Rahway, NJ 07065, USA. Petra_Doefler@Merck.com

Proceedings of the National Academy of Sciences of the United States of America

|July 27, 2001

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Gamma-secretase inhibitors targeting amyloid-beta peptide production in Alzheimer's disease research also impact Notch signaling. These inhibitors disrupt thymocyte development, showing a dose-dependent effect on T cell differentiation.

Area of Science:

Neuroscience
Immunology
Cell Biology

Background:

Presenilin-dependent gamma-secretase activity is crucial for cleaving amyloid precursor proteins (APP) and releasing Notch intracellular domain.
Aberrant amyloid-beta (Abeta) peptide accumulation is linked to Alzheimer's disease, making gamma-secretase inhibition a therapeutic target.
Notch signaling is vital for cell fate determination, particularly in mammalian T cell development.

Purpose of the Study:

To investigate whether structurally diverse gamma-secretase inhibitors affect Notch function.
To analyze the impact of these inhibitors on thymocyte development in murine fetal organ cultures.

Main Methods:

Utilizing murine fetal thymic organ cultures to study thymocyte development.
Administering structurally diverse gamma-secretase inhibitors at varying concentrations.

Related Experiment Videos

Main Results:

High concentrations of potent inhibitors blocked thymocyte development at the earliest immature stage.
Lower concentrations or less potent inhibitors impaired differentiation at later stages, notably suppressing CD8 single-positive T cell development.
Observed phenotypes indicate a dose-dependent impairment of Notch signaling by gamma-secretase inhibitors.

Conclusions:

Gamma-secretase inhibitors significantly impact thymocyte development, confirming their interference with Notch signaling.
The study defines a strict Notch dose dependence for consecutive stages of thymocyte development.
These findings highlight potential complexities in using gamma-secretase inhibitors for Alzheimer's disease therapy due to off-target effects on Notch signaling.