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Journal of Histochemistry and Cytochemistry, Vol. 49, 973-982, August 2001, Copyright © 2001, The Histochemical Society, Inc.

ARTICLE

SLC26A2 (Diastrophic Dysplasia Sulfate Transporter) Is Expressed in Developing and Mature Cartilage But Also in Other Tissues and Cell Types

Siru Hailaa, Johanna Hästbackaa, Tom Böhlingb, Marja-Liisa Karjalainen–Lindsbergb, Juha Kerea,c, and Ulpu Saarialho–Kered
a Department of Medical Genetics, Haartman Institute, University of Helsinki, Helsinki, Finland
b Department of Pathology and HUCH-Laboratory Diagnostics, Haartman Institute, University of Helsinki, Helsinki, Finland
c Finnish Genome Center, University of Helsinki, Helsinki, Finland
d Department of Dermatology, Helsinki University Central Hospital, Helsinki, Finland

Correspondence to: Juha Kere, Finnish Genome Center, PO Box 2, Tukholmankatu 2, 00014 University of Helsinki, Finland. E-mail: Juha.Kere@helsinki.fi

Mutated alleles of the SLC26A2 (diastrophic dysplasia sulfate transporter or DTDST) gene cause each of the four recessive chondrodysplasias, i.e., diastrophic dysplasia (DTD), multiple epiphyseal dysplasia (MED), atelosteogenesis Type II (AO2), and achondrogenesis Type IB (ACG1B). SLC26A2 acts as an Na+-independent sulfate/chloride antiporter and belongs to the SLC26 anion transporter gene family, currently consisting of six homologous human members. Although Northern analysis has indicated some expression in all tissues studied, the only tissue known to be affected by SLC26A2 mutations is cartilage. Abundant SLC26A2 expression has previously been detected in normal human colon by in situ hybridization. We have used in situ hybridization and immunohistochemistry to examine multiple normal tissues for the expression of human SLC26A2. As expected, a strong signal for SLC26A2 mRNA and protein immunostaining were detected in developing fetal hyaline cartilage, while bronchial cartilage showed mRNA expression in adult tissues. SLC26A2 expression could also be detected in eccrine sweat glands, in bronchial glands, and in placental villi. In addition, immunoreactivity for the SLC26A2 protein was observed in exocrine pancreas. Our results suggest a more limited expression pattern for SLC26A2 than that found by Northern analysis. However, SLC26A2 expression is also detected in tissues not affected in chondrodysplasias caused by SLC26A2 mutations.

(J Histochem Cytochem 49:973–982, 2001)

Key Words: DTDST, immunohistochemistry, human, expression, SLC26


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