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• W2072381681 abstract "Background/Aims: Janus-activated kinase-2 JAK2 is activated by energy depletion and hyperosmotic shock and modifies the activity of several Na+ coupled transporters. The Na+ coupled osmolyte transporter SMIT (myoinositol transporter) is upregulated by osmotic shock and downregulated by energy depletion. The present study thus explored whether JAK2 contributes to the regulation of SMIT activity. Methods: To this end, cRNA encoding SMIT was injected into Xenopus oocytes with or without additional injection of cRNA encoding wild type JAK2, constitutively active V617FJAK2 or inactive K882EJAK2. Inositol-induced current (ISMIT) was determined by dual electrode voltage clamp and taken as measure for electrogenic inositol transport. Results: No appreciable ISMIT was observed in water injected oocytes. In SMIT expressing oocytes ISMIT was significantly decreased by additional coexpression of JAK2 or V617FJAK2, but not by coexpression of K882EJAK2. According to kinetic analysis coexpression of JAK2 decreased maximal ISMIT without significantly modifying the concentration required for halfmaximal ISMIT (KM). In oocytes expressing both, SMIT and JAK2, ISMIT was gradually increased by JAK2 inhibitor AG490 (40 µM). Disruption of carrier insertion with brefeldin A (5 µM) was followed by a decline of ISMIT to a similar extent in Xenopus oocytes expressing SMIT with JAK2 and in Xenopus oocytes expressing SMIT alone, suggesting that JAK2 did not affect carrier stability in the cell membrane. Conclusion: JAK2 contributes to the regulation of the inositol transporter SMIT." @default.
• W2072381681 created "2016-06-24" @default.
• W2072381681 creator A5028752327 @default.
• W2072381681 creator A5075308594 @default.
• W2072381681 creator A5084208566 @default.
• W2072381681 date "2012-01-01" @default.
• W2072381681 modified "2023-09-26" @default.
• W2072381681 title "Down-Regulation of the Myoinositol Transporter SMIT by JAK2" @default.
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• W2072381681 doi "https://doi.org/10.1159/000343335" @default.
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• W2072381681 hasPublicationYear "2012" @default.
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