alexa Expression and localization of cysteine sulfinate decarboxylase in major salivary glands of male mice.
Biochemistry

Biochemistry

Journal of Membrane Science & Technology

Author(s): Liu S, Liu Y, Ma Q, Cui S, Liu J

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Abstract Taurine (2-aminoethanesulfonic acid) is the most abundant free amino acid in mammalian cells. It plays a significant role in cell development, nutrition, and survival, such as in the regulation of ion transport and osmoregulation. Cysteine sulfinate decarboxylase (CSD) is the rate-limiting biosynthetic enzyme of taurine. Recently, the synthesis of taurine has been observed in the central nervous system, kidney, liver, and muscle. However, the synthesis of taurine in the salivary glands has still not been described in detail. We have detected CSD expression in the major salivary glands of adult male mice by real-time polymerase chain reaction (RT-PCR), Western blot, and immunofluorescence. In addition, we determined the content of taurine by high-performance liquid chromatography (HPLC). The results show that taurine is present in high concentrations in the major salivary glands of male mice. CSD messenger RNA (mRNA) and protein are expressed in the major salivary glands of male mice. The relative levels of CSD mRNA increase from the submandibular gland (SMG) to the sublingual gland (SLG) and parotid gland (PG), but the levels of the CSD protein are the opposite. The immunofluorescence results indicate that CSD is mainly located in the excretory ducts (EDs) and interlobular duct (IL) of SMG and ED in SLG, respectively. These results suggest that the major salivary glands of male mice produce taurine through the CSD pathway, and the synthesis of taurine might be related to sodium reabsorption in the salivary glands. Copyright © 2014 Elsevier Ltd. All rights reserved. This article was published in Arch Oral Biol and referenced in Journal of Membrane Science & Technology

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