Atherosclerosis in mice is not affected by a reduction in tissue factor expression

Area of Science:

• Cardiovascular Biology
• Immunology
• Genetics

Background:

• Atherosclerosis is a chronic inflammatory disease characterized by plaque buildup in arteries.
• Tissue Factor (TF) is a procoagulant protein implicated in thrombosis and inflammation.
• The role of TF in atherosclerotic lesion progression remains incompletely understood.

Purpose of the Study:

• To investigate the contribution of Tissue Factor (TF) to the development and progression of atherosclerotic lesions.
• To determine if reducing TF levels in all cells affects atherosclerosis.
• To assess the impact of selectively reducing TF in hematopoietic cells on atherosclerosis.

Main Methods:

• Used apolipoprotein E-deficient (apoE(-/-)) mice with a 50% reduction in TF levels to study overall TF contribution.
• Utilized low-density lipoprotein receptor-deficient (LDLR(-/-)) mice transplanted with bone marrow from low-TF expressing mice to assess hematopoietic TF.
• Administered standard chow or atherogenic diets and analyzed atherosclerotic lesion extent and cellular composition.

Main Results:

• A 50% reduction in TF levels in all cells did not alter atherosclerosis in apoE(-/-) mice on regular chow.
• Selective reduction of TF in hematopoietic cells did not affect atherosclerosis development or lesion composition in LDLR(-/-) mice on an atherogenic diet.
• Premature death prevented analysis of atherosclerosis in apoE(-/-) mice with very low TF levels.

Conclusions:

• A 50% reduction in TF across all cells does not influence atherosclerotic lesion development in mice.
• Selective reduction of TF in hematopoietic cells does not impact the progression of atherosclerosis.
• These findings suggest that TF may not be a critical factor in the development of atherosclerotic lesions under these experimental conditions.