Volume 82, Issue 3 pp. 346-351
Original Article

Distinguishing primary from secondary Δ4-3-oxosteroid 5β-reductase (SRD5B1, AKR1D1) deficiency by urinary steroid analysis

Tadahiro Yanagi

Tadahiro Yanagi

Department of Pediatrics and Child Health, Kurume University School of Medicine, Kurume, Japan

Search for more papers by this author
Tatsuki Mizuochi

Tatsuki Mizuochi

Department of Pediatrics and Child Health, Kurume University School of Medicine, Kurume, Japan

Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA

Search for more papers by this author
Keiko Homma

Keiko Homma

Central Clinical Laboratories, Keio University Hospital, Tokyo, Japan

Search for more papers by this author
Isao Ueki

Isao Ueki

Department of Pediatrics and Child Health, Kurume University School of Medicine, Kurume, Japan

Search for more papers by this author
Yoshitaka Seki

Yoshitaka Seki

Department of Pediatrics and Child Health, Kurume University School of Medicine, Kurume, Japan

Search for more papers by this author
Tomonobu Hasegawa

Tomonobu Hasegawa

Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan

Search for more papers by this author
Hajime Takei

Hajime Takei

Institution of Bile Acid, Junshin Clinic, Tokyo, Japan

Search for more papers by this author
Hiroshi Nittono

Hiroshi Nittono

Institution of Bile Acid, Junshin Clinic, Tokyo, Japan

Search for more papers by this author
Takao Kurosawa

Takao Kurosawa

Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Hokkaido, Japan

Search for more papers by this author
Toyojiro Matsuishi

Toyojiro Matsuishi

Department of Pediatrics and Child Health, Kurume University School of Medicine, Kurume, Japan

Search for more papers by this author
Akihiko Kimura

Corresponding Author

Akihiko Kimura

Department of Pediatrics and Child Health, Kurume University School of Medicine, Kurume, Japan

Correspondence: Akihiko Kimura, Department of Pediatrics and Child Health, Kurume University School of Medicine, 67 Asahi-machi, Kurume-shi 830-0011, Japan. Tel.: 81-942-31-7565; Fax: 81-942-38-1792; E-mail: [email protected]Search for more papers by this author
First published: 22 August 2014
Citations: 4

Summary

Objective

Deficiency of Δ4-3-oxosteroid 5β-reductase (5β-reductase), a bile acid synthesis disorder, presents findings of neonatal cholestasis and hyper-3-oxo-Δ4 bile aciduria. The 5β-reductase enzyme participates in not only bile acid synthesis but also hepatic steroid metabolism. Deficiency of 5β-reductase includes 2 types: primary deficiency, with an SRD5B1 gene mutation; and secondary deficiency, lacking a mutation. Secondary deficiency is caused by fulminant liver failure from various aetiologies including neonatal hemochromatosis (NH). Distinguishing primary from secondary deficiency based on γ-glutamyltransferase (GGT), serum total bile acids (TBA), and urinary bile acid analysis using gas chromatography–mass spectroscopy (GC-MS) is very difficult. SRD5B1 gene analysis is the only reliable method. We examined urinary steroid analysis as a way to distinguish primary from secondary 5β-reductase deficiency.

Design, patients and measurements

We examined 12 patients with cholestatic jaundice, normal or slightly elevated GGT, and hyper-3-oxo-Δ4 bile aciduria using urinary steroid analysis by GC-MS of both cortisol and cortisone compounds, such as 5β-tetrahydrocortisol (5β-THF) and 5β-tetrahydrocortisone (5β-THE). Patients previously were diagnosed with primary 5β-reductase deficiency (n = 3), deficiency secondary to NH (n = 3) and deficiency secondary to other liver disorders (n = 6).

Results

Urinary steroid analysis in 3 primary deficiency and 3 NH patients showed low 5β-THE and elevated 5α/5β-THE ratios, making distinction difficult without also considering the clinical course and abdominal magnetic resonance imaging (MRI) findings, such as a very low signal intensity in liver and/or pancreas, especially in T2-weighted images. In the six patients with other secondary deficiencies, urinary 5β-THF and 5α/5β-THF differed from those in primary deficiency (P < 0·05).

Conclusions

Urinary steroid analysis can distinguish primary and NH-related deficiencies from other secondary deficiencies.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.