α-Muricholic acid is a murine-specific primary bile acid.[1] Dietary administration of soybean protein decreases fecal levels of α-muricholic acid in mice with high-fat diet-induced obesity which correlates with increases in fecal Clostridium cluster XIVa, a major producer of secondary bile acids.[2] [3] Plasma, liver, and muscle levels of α-muricholic acid are increased in mice switched from a high-fat to low-fat diet.[4]

Reference:
[1]. Eyssen, H.J., Parmentier, G.G., and Mertens, J.A. Sulfate bile acids in germ-free and conventional mice. Eur. J. Biochem. 66(3), 507-514 (1976).
[2]. Uehara, T., Xi Peng, X., Bennett, B., et al. c-Jun N-terminal kinase mediates hepatic injury after rat liver transplantation. Transplantation 78(3), 324-332 (2004).
[3]. Watanabe, K., Igarashi, M., Li, X., et al. Dietary soybean protein ameliorates high-fat diet-induced obesity by modifying the gut microbiota-dependent biotransformation of bile acids. PLoS One 13(8), e0202083 (2018).
[4]. La Frano, M.R., Hernandez-Carretero, A., Weber, N., et al. Diet-induced obesity and weight loss alter bile acid concentrations and bile acid-sensitive gene expression in insulin target tissues of C57BL/6J mice. Nutr. Res. 46, 11-21 (2017).