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Breast Cancer Research
Published in: Breast Cancer Research 6/2005

Open Access 01-12-2005 | Research article

25-Hydroxyvitamin D31α-hydroxylase expression in breast cancer and use of non-1α-hydroxylated vitamin D analogue

Authors: Ulrika Segersten, Pernille Kaae Holm, Peyman Björklund, Ola Hessman, Hans Nordgren, Lise Binderup, Göran Åkerström, Per Hellman, Gunnar Westin

Published in: Breast Cancer Research | Issue 6/2005

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Abstract

Introduction

The cytochrome P450 mitochondrial enzyme 25-hydroxyvitamin D3 1α-hydroxylase (1α-hydroxylase) of renal tubule cells hydroxylates the major circulating form of vitamin D (25(OH)D3) to the active systemic hormone 1,25(OH)2D3. Local production of 1,25(OH)2D3 appears to occur also at other sites where 1α-hydroxylase is expressed for autocrine/paracrine regulation. To reduce risks of hypercalcemia during treatment with vitamin D, we have previously suggested use of non-1α-hydroxylated vitamin D analogues to target tissues where 1α-hydroxylase is expressed, including the parathyroid glands in secondary hyperparathyroidism. The present study was undertaken to examine expression of 1α-hydroxylase in breast cancer and to investigate whether a non-1α-hydroxylated vitamin D analogue displayed biological function. In addition, expression of the 25-hydroxyvitamin D3 24-hydroxylase (24-hydroxylase) and the vitamin D receptor (VDR) was investigated.

Methods

The expression of 1α-hydroxylase, 24-hydroxylase and VDR was investigated in breast cancer specimens (n = 19) and normal breast tissues (n = 10) by immunohistochemistry and/or RT-PCR. Consecutive cryosections of 6 μm essentially free of immune cells were used in the analyses. The effect of vitamin D analogues on transcriptional activation was analyzed in transiently transfected MCF-7 breast cancer cells.

Results

1α-hydroxylase protein was demonstrated in 79% and 100% of breast cancer specimens and normal breast, respectively. The overall relative mRNA levels of 1α-hydroxylase and 24-hydroxylase in normal breast compared to breast tumors were: 1α-hydroxylase, 1 ± 0.07 versus 0.7 ± 0.05, respectively (p < 0.001); 24-hydroxylase, 1 ± 0.08 verus 2.1 ± 0.2, respectively (p < 0.001). The VDR was expressed in 95% of the tumors as expected, with mRNA levels of 1 ± 0.09 and 1.4 ± 0.12 (p < 0.05) in breast cancer and normal breast, respectively. The ketoconazole-sensitive transcription activation potential of the non-1α-hydroxylated vitamin D analogue prodrug of EB1089 (EB1285) was demonstrated in MCF-7 cells, which express 1α-hydroxylase. The activity of EB1285 was about 20% of 1,25(OH)2D3.

Conclusion

These results demonstrate nearly normal expression levels of 1α-hydroxylase, 24-hydroxylase and VDR in the majority of investigated breast cancer specimens. A non-1α-hydroxylated vitamin D analogue displayed activity in breast cancer cells. Such analogues may present future therapeutic options for proliferative disorders where 1α-hydroxylase is expressed.
Appendix
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Metadata
Title
25-Hydroxyvitamin D31α-hydroxylase expression in breast cancer and use of non-1α-hydroxylated vitamin D analogue
Authors
Ulrika Segersten
Pernille Kaae Holm
Peyman Björklund
Ola Hessman
Hans Nordgren
Lise Binderup
Göran Åkerström
Per Hellman
Gunnar Westin
Publication date
01-12-2005
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 6/2005
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr1332

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