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Differential intestinal mucosal protein expression in hypercholesterolemic mice fed a phytosterol-enriched diet
Laura Calpe-Berdiel1, Joan Carles Escolà-Gil, Josep Julve
1Servei de Bioquímica i Institut de Recerca, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.
Proteomics
|July 5, 2007
Summary
Phytosterols alter intestinal protein expression, affecting cholesterol absorption and potentially other health benefits. This study identified key proteins like annexins and beta-actin that may mediate these effects.
Area of Science:
- Proteomics
- Molecular Biology
- Cholesterol Metabolism
Background:
- Phytosterols are plant compounds known to reduce intestinal cholesterol absorption.
- Their precise molecular mechanisms and other biological properties (e.g., immunomodulatory, anti-cancer) are not fully understood.
- Understanding these mechanisms is crucial for leveraging phytosterols for health benefits.
Purpose of the Study:
- To investigate the molecular mechanisms of phytosterol action in the intestinal mucosa.
- To identify differentially expressed proteins in response to phytosterol feeding using a proteomic approach.
- To explore the potential roles of identified proteins in phytosterol-mediated biological effects.
Main Methods:
- Proteomic analysis using 2-D DIGE and MALDI-TOF MS on intestinal mucosa of phytosterol-fed hypercholesterolemic mice (apoE-/-).
- Validation of key protein expression changes (Annexin A2, A4, A5, beta-actin) by Western blot.
- Analysis of intestinal gene expression for selected proteins.
- Retesting of protein expression changes in normocholesterolemic mice (C57BL/6J).
Main Results:
- Nine differentially expressed proteins were identified, involved in membrane stabilization, cytoskeleton, and cholesterol metabolism.
- Annexin A4 (ANXA4) and Annexin A5 (ANXA5) protein levels increased, while Annexin A2 (ANXA2) and beta-actin decreased in response to phytosterols.
- These protein changes were observed in both hypercholesterolemic and normocholesterolemic mouse models, though gene expression changes were model-specific.
Conclusions:
- Phytosterol consumption significantly alters the expression of specific proteins, including annexins and beta-actin, in the intestinal mucosa.
- These protein changes, particularly involving ANXA2, ANXA4, ANXA5, and beta-actin, may play a role in modulating cholesterol transport, apoptosis, and inflammation.
- The identified proteins are potential mediators of the diverse biological effects attributed to phytosterols.
