Block of native Ca(2+)-permeable AMPA receptors in rat brain by intracellular polyamines generates double rectification

D. Koh, N. Burnashev, P.M. Jonas, Journal of Physiology 486 (1995) 305–312.


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Abstract
1. The influence of intracellular factors on current rectification of different subtypes of native α-amino-3-hydroxy-5-methyl-4-isoxazolepropionate receptors (AMPARs) was studied in rat brain slices by combining fast application of glutamate with patch pipette perfusion. 2. The peak current-voltage (I-V) relation of the AMPARs expressed in Bergmann glial cells of cerebellum and dentate gyrus (DG) basket cells of hippocampus was weakly rectifying in outside-out patches and nystatin-perforated vesicles, but showed a doubly rectifying shape with a region of reduced slope between 0 and +40 mV in nucleated patches. The I-V relation of AMPARs expressed in hippocampal CA3 pyramidal neurones was linear in all recording configurations. 3. Intracellular application of 2.5 μM spermine, a naturally occurring polyamine, blocked outward currents in outside-oat patches from Bergmann glial cells and DG basket cells in a voltage-dependent manner, generating I-V relations with a doubly rectifying shape which were similar to those recorded in nucleated patches. AMPARs in CA3 pyramidal cell patches were unaffected by 25 μM spermine. 4. The half-maximal blocking concentration of spermine at +40 mV was 0.3 μM in Bergmann glial cell patches and 1.5 μM in DG basket cell patches, whereas it was much higher (≥ 100 μM) for CA3 pyramidal. cell patches. Spermidine also affected current rectification, but with lower affinity. The block of outward current by polyamines following voltage jumps developed within < 0.5 ms. 5. We conclude that current rectification, rather than being an intrinsic property of the Ca2+ permeable AMPAR channel, is generated by polyamine block.
Publishing Year
Date Published
1995-07-15
Journal Title
Journal of Physiology
Volume
486
Issue
Pt 2
Page
305 - 312
IST-REx-ID

Cite this

Koh D, Burnashev N, Jonas PM. Block of native Ca(2+)-permeable AMPA receptors in rat brain by intracellular polyamines generates double rectification. Journal of Physiology. 1995;486(Pt 2):305-312. doi:10.1113/jphysiol.1995.sp020813
Koh, D., Burnashev, N., & Jonas, P. M. (1995). Block of native Ca(2+)-permeable AMPA receptors in rat brain by intracellular polyamines generates double rectification. Journal of Physiology, 486(Pt 2), 305–312. https://doi.org/10.1113/jphysiol.1995.sp020813
Koh, Duk, Nail Burnashev, and Peter M Jonas. “Block of Native Ca(2+)-Permeable AMPA Receptors in Rat Brain by Intracellular Polyamines Generates Double Rectification.” Journal of Physiology 486, no. Pt 2 (1995): 305–12. https://doi.org/10.1113/jphysiol.1995.sp020813.
D. Koh, N. Burnashev, and P. M. Jonas, “Block of native Ca(2+)-permeable AMPA receptors in rat brain by intracellular polyamines generates double rectification,” Journal of Physiology, vol. 486, no. Pt 2, pp. 305–312, 1995.
Koh D, Burnashev N, Jonas PM. 1995. Block of native Ca(2+)-permeable AMPA receptors in rat brain by intracellular polyamines generates double rectification. Journal of Physiology. 486(Pt 2), 305–312.
Koh, Duk, et al. “Block of Native Ca(2+)-Permeable AMPA Receptors in Rat Brain by Intracellular Polyamines Generates Double Rectification.” Journal of Physiology, vol. 486, no. Pt 2, Wiley-Blackwell, 1995, pp. 305–12, doi:10.1113/jphysiol.1995.sp020813.

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