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Inhibition of the Primary Bile Acid Synthesis Pathways in SD Rats at Different Altitudes.

Piao Ma¹, Qingfei Hu¹, Fan Ma¹

¹State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China.

Animals : an Open Access Journal From MDPI

|May 4, 2026

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High altitude significantly reduces bile acid synthesis in rats by inhibiting key genes. This suggests high-altitude hypoxia impacts cholesterol homeostasis and lipid metabolism.

Area of Science:

Biochemistry
Physiology
Altitude Medicine

Background:

Bile acids are crucial for cholesterol catabolism and homeostasis.
Primary bile acid synthesis occurs via classical and alternative pathways.
High-altitude environments present unique physiological challenges.

Purpose of the Study:

To investigate the impact of altitude on serum bile acid profiles in Sprague-Dawley (SD) rats.
To analyze the effects of altitude on primary bile acid synthesis pathways.
To understand the role of high-altitude hypobaric hypoxia in regulating bile acid metabolism.

Main Methods:

Serum bile acid composition was analyzed using Ultra-Performance Liquid Chromatography-Tandem Mass Spectrometry (UPLC-MS/MS).
Quantitative Reverse Transcription Polymerase Chain Reaction (qRT-PCR) assessed gene expression.

Keywords:

Sprague-Dawley rats bile acid synthesis pathway bile acids serum

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Western blotting evaluated protein expression of key metabolic regulators.

Main Results:

Serum total and primary bile acid levels decreased with increasing altitude.
Hepatic expression of key synthesis genes (Cyp7a1, Cyp8b1, Cyp27a1, Cyp7b1) and FXR were significantly downregulated.
FGF15 protein expression significantly decreased, indicating pathway inhibition.

Conclusions:

Primary bile acid synthesis in SD rats is predominantly via the classical pathway.
Increasing altitude significantly inhibits bile acid synthesis, with hypobaric hypoxia as the likely factor.
This study provides insights into adaptive mechanisms of bile acid metabolism under high-altitude conditions.