Cited by 183Protein Kinase Regulation and GTPase SignalingNeuroscience and Neuropharmacology ResearchPhosphodiesterase function and regulation

Distinct enzyme combinations in AKAP signalling complexes permit functional diversity

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Hoshi, Naoto, Langeberg, Lorene K., Scott, John D.·2005·Nature Cell Biology

Abstract

Specificity in cell signalling can be influenced by the targeting of different enzyme combinations to substrates. The A-kinase anchoring protein AKAP79/150 is a multivalent scaffolding protein that coordinates the subcellular localization of second-messenger-regulated enzymes, such as protein kinase A, protein kinase C and protein phosphatase 2B. We developed a new strategy that combines RNA interference of the endogenous protein with a protocol that selects cells that have been rescued with AKAP79/150 forms that are unable to anchor selected enzymes. Using this approach, we show that AKAP79/150 coordinates different enzyme combinations to modulate the activity of two distinct neuronal ion channels: AMPA-type glutamate receptors and M-type potassium channels. Utilization of distinct enzyme combinations in this manner provides a means to expand the repertoire of cellular events that the same AKAP modulates.

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  • The findings are in agreement with previous studies in culture preparations that implicated AKAP79/150-CaN anchoring in regulation of AMPAR activity and endocytosis underlying LTD.

    “Our findings are also in agreement with previous studies in culture preparations that implicated AKAP79/150-CaN anchoring in regulation of AMPAR activity and endocytosis underlying LTD”

    From AKAP150-Anchored Calcineurin Regulates Synaptic Plasticity by Limiting Synaptic Incorporation of Ca<sup>2+</sup>-Permeable AMPA Receptors (2012) · cites this paper as Hoshi et al., 2005

    The Results (page unavailable) show that AKAP79/150 anchoring of PP2B (calcineurin) is required for downregulation of AMPA currents in cultured rat hippocampal neurons. Our copy does not show that this anchoring regulates AMPAR endocytosis or demonstrate that the observed current changes underlie LTD. (LLM, conf=0.88)

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  • In cultured rat hippocampal neurons, Ca2+, CaN activity, and the AKAP79/150 CaN anchoring domain are required for down-regulation of AMPAR currents and internalization of AMPAR in response to acute NMDA receptor activation or inhibition of PKA anchoring and activity.

    “In cultured rat hippocampal neurons, Ca2+, CaN activity, and the AKAP79/150 CaN anchoring domain are required for the down-regulation of AMPAR currents and internalization of AMPAR in response to either acute NMDA receptor activation or inhibition of PKA anchoring and activity”

    From AKAP150-Anchored Calcineurin Regulates Synaptic Plasticity by Limiting Synaptic Incorporation of Ca<sup>2+</sup>-Permeable AMPA Receptors (2012) · cites this paper as Hoshi et al., 2005

    The Results report that, in cultured rat hippocampal neurons, AKAP150 silencing abolished glutamate-dependent attenuation of AMPA currents and that rescue required the PP2B (calcineurin) anchoring site. They also report that inhibiting PKA activity with PKI induced AMPA-current downregulation. The passages do not establish a requirement for Ca2+ or calcineurin activity, or show AMPAR internalization or a response specifically to acute NMDA receptor activation. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Past work in heterologous cells demonstrated that negative regulation of recombinant GluA1 currents by AKAP79 involved dephosphorylation of S845 but not S831, required anchored CaN, and was opposed by anchored PKA.

    “past work in heterologous cells demonstrated that negative regulation of recombinant GluA1 currents by AKAP79 involved dephosphorylation of S845 but not S831, required anchored CaN, and was opposed by anchored PKA”

    From AKAP150-Anchored Calcineurin Regulates Synaptic Plasticity by Limiting Synaptic Incorporation of Ca<sup>2+</sup>-Permeable AMPA Receptors (2012) · cites this paper as Hoshi et al., 2005

    The Results (page unavailable) show that recombinant GluR1 currents run down in HEK293 cells and that loss of PP2B (calcineurin) anchoring prevents this rundown. They also link anchored PKA to Ser 845 phosphorylation and, in hippocampal neurons, to maintaining AMPA currents. The paper does not demonstrate that the current reduction specifically involves dephosphorylation of Ser 845 rather than Ser 831, or establish PKA's opposing effect in the heterologous-cell experiments. (LLM, conf=0.86)

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Authors
Hoshi, N., Langeberg, L. K., & Scott, J. D.
Affiliations
Howard Hughes Medical Institute (US)
Corresponding author
Scott, John D.
Venue
Nature Cell Biology
Published
2005-10-16
Volume
7
Issue
11
Pages
1066-1073
ISSN
  • 1465-7392 (ISSN-L)
  • 1476-4679
OpenAlex
W2096445692
Cited by
183
References
30
Citations by year
2026: 3 · 2025: 2 · 2024: 4 · 2023: 1 · 2022: 3 · 2021: 5 · 2020: 10 · 2019: 4 · 2018: 6 · 2017: 5 · 2016: 6 · 2015: 10 · 2014: 5 · 2013: 6 · 2012: 25
FWCI
5.04
Type
journal article
Language
en
Open access
Locations
  • Nature Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • University of Missouri
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01GM048231, GM-48231, R37GM048231)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Phosphodiesterase function and regulation
Keywords
AKAP79/150, A-kinase anchoring proteins, protein kinase A, protein kinase C, calcineurin, AMPA receptors, M-type potassium channels, neuronal ion channels
MeSH terms
Discs Large Homolog 1 Protein, Carrier Proteins, Cell Line, Humans, Membrane Proteins, Models, Biological, Time Factors, Transfection, Potassium Channels, Signal Transduction, Cyclic AMP-Dependent Protein Kinases, alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid, Muscarinic Agonists, Calcineurin, Membrane Transport Proteins, RNA Interference, Adaptor Proteins, Signal Transducing, Calcineurin Inhibitors

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