Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology · 2012
Glucose transport by acinar cells in rat parotid glands.
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Jurysta Cedric, Nicaise Charles, Cetik Sibel, Louchami Karim, Malaisse Willy J, Sener Abdullah
Аннотация
BACKGROUND/AIMS: Salivary glucose is often considered as being from glandular origin. Little information is available, however, on the possible role of glucose transporters in the secretion of the hexose by salivary glands. The major aim of the present study was to investigate the expression and localization of several distinct glucose transporters in acinar cells of rat parotid glands.
METHODS: Quantitative real-time PCR analysis, immunohistochemistry and western blotting techniques were used to assess the presence of SGLT1, GLUT1, GLUT2 and GLUT4 in acinar cells of rat parotid glands.
RESULTS: Quantitative real-time PCR documented the expression of SGLT1 and GLUT1 in parotid tissues, with a much lower level of GLUT4 mRNA and no expression of GLUT2 mRNA. Western blot analysis revealed the presence of SGLT1, GLUT1 and GLUT4 proteins, but not GLUT2 proteins in the parotid extract. Immunohistochemistry confirmed these findings. SGLT1 was specifically located at the baso-lateral membrane, co-localizing with Na(+)/K(+) ATPase. GLUT1 was found both at the baso-lateral and apical level. GLUT4 appeared to be also located at the baso-lateral level. However, too little GLUT4 was present to allow co-localization labeling.
CONCLUSION: Based on these findings, a model is proposed for the transport of glucose into the acinar cells and thereafter into the acinar lumen.
METHODS: Quantitative real-time PCR analysis, immunohistochemistry and western blotting techniques were used to assess the presence of SGLT1, GLUT1, GLUT2 and GLUT4 in acinar cells of rat parotid glands.
RESULTS: Quantitative real-time PCR documented the expression of SGLT1 and GLUT1 in parotid tissues, with a much lower level of GLUT4 mRNA and no expression of GLUT2 mRNA. Western blot analysis revealed the presence of SGLT1, GLUT1 and GLUT4 proteins, but not GLUT2 proteins in the parotid extract. Immunohistochemistry confirmed these findings. SGLT1 was specifically located at the baso-lateral membrane, co-localizing with Na(+)/K(+) ATPase. GLUT1 was found both at the baso-lateral and apical level. GLUT4 appeared to be also located at the baso-lateral level. However, too little GLUT4 was present to allow co-localization labeling.
CONCLUSION: Based on these findings, a model is proposed for the transport of glucose into the acinar cells and thereafter into the acinar lumen.
Предметные рубрики MeSH
Acinar CellsAnimalsBiological TransportCell MembraneFemaleGene Expression RegulationGlucoseGlucose Transport Proteins, FacilitativeGlucose Transporter Type 1Glucose Transporter Type 2ImmunohistochemistryKidneyPancreasParotid GlandRNA, MessengerRatsRats, WistarReverse Transcriptase Polymerase Chain ReactionSodium-Glucose Transporter 1Sodium-Potassium-Exchanging ATPase