P2X receptors trigger intracellular alkalization in isolated perfused mouse medullary thick ascending limb

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P2X receptors trigger intracellular alkalization in isolated perfused mouse medullary thick ascending limb

AIMS Extracellular ATP is an important regulator of renal tubular transport. Recently, we found that basolateral ATP markedly inhibits Na(+) and Cl(-) absorption in mouse medullary thick ascending limb (mTAL) via a P2X receptor. The underlying mechanism that mediates this ATP-dependent transport inhibition in mTAL is, however, unclear. The renal outer medullary K(+) channel (ROMK) is sensitive ...

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Basolateral P2X receptors mediate inhibition of NaCl transport in mouse medullary thick ascending limb (mTAL).

Extracellular nucleotides regulate epithelial transport via luminal and basolateral P2 receptors. Renal epithelia express multiple P2 receptors, which mediate significant inhibition of solute absorption. Recently, we identified several P2 receptors in the medullary thick ascending limb (mTAL) including luminal and basolateral P2Y(2) receptors (Jensen ME, Odgaard E, Christensen MH, Praetorius HA...

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AVP-stimulated nucleotide secretion in perfused mouse medullary thick ascending limb and cortical collecting duct.

Extracellular nucleotides are local, short-lived signaling molecules that inhibit renal tubular transport via both luminal and basolateral P2 receptors (1, 2). Apparently, the renal epithelium itself is able to release nucleotides (3, 4). The mechanism and circumstances under which epithelia nucleotide release is stimulated remains elusive (5, 6). Here, we investigate the phenomenon of nucleoti...

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Ammonium carriers in medullary thick ascending limb.

Absorption of NH(4)(+) by the medullary thick ascending limb (MTAL) is a key event in the renal handling of NH(4)(+), leading to accumulation of NH(4)(+)/NH(3) in the renal medulla, which favors NH(4)(+) secretion in medullary collecting ducts and excretion in urine. The Na(+)-K(+)(NH(4)(+))-2Cl(-) cotransporter (BSC1/NKCC2) ensures approximately 50-65% of MTAL active luminal NH(4)(+) uptake un...

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Extracellular ATP inhibits transport in medullary thick ascending limbs: role of P2X receptors.

Absorption of NaCl by the thick ascending limb (TAL) involves active transport and therefore depends on oxidative phosphorylation. Extracellular ATP has pleiotropic effects, including both stimulation and inhibition of transport and inhibition of oxidative phosphorylation. However, it is unclear whether ATP alters TAL transport and how this occurs. We hypothesized that ATP inhibits TAL Na absor...

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ژورنال

عنوان ژورنال: Acta Physiologica

سال: 2014

ISSN: 1748-1708,1748-1716

DOI: 10.1111/apha.12417