Cited by 85Nicotinic Acetylcholine Receptors StudyIon channel regulation and functionEpilepsy research and treatment

Five ADNFLE Mutations Reduce the Ca2+ Dependence of the Mammalian α4β2 Acetylcholine Response

Open access
Rodrigues‐Pinguet, Nivalda, Jia, Li, Li, Maureen, Figl, Antonio, Klaassen, Alwin, Truong, Anthony, Lester, Henry A., Cohen, Bruce N.·2003·The Journal of Physiology

Abstract

Five nicotinic acetylcholine receptor (nAChR) mutations are currently linked to autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE). The similarity of their clinical symptoms suggests that a common functional anomaly of the mutations underlies ADNFLE seizures. To identify this anomaly, we constructed rat orthologues (S252F, +L264, S256L, V262L, V262M) of the human ADNFLE mutations, expressed them in Xenopus oocytes with the appropriate wild‐type (WT) subunit (α4 or β2), and studied the Ca 2+ dependence of their ACh responses. All the mutations significantly reduced 2 mM Ca 2+‐induced increases in the 30 μM ACh response (P < 0.05). Consistent with a dominant mode of inheritance, this reduction persisted in oocytes injected with a 1:1 mixture of mutant and WT cRNA. BAPTA injections showed that the reduction was not due to a decrease in the secondary activation of Ca 2+‐activated Cl− currents. The S256L mutation also abolished 2 mM Ba 2+ potentiation of the ACh response. The S256L, V262L and V262M mutations had complex effects on the ACh concentration‐response relationship but all three mutations shifted the concentration‐response relationship to the left at [ACh]⩾ 30 μM. Co‐expression of the V262M mutation with a mutation (E180Q) that abolished Ca 2+ potentiation resulted in 2 mM Ca 2+ block, rather than potentiation, of the 30 μM ACh response, suggesting that the ADNFLE mutations reduce Ca 2+ potentiation by enhancing Ca 2+ block of the α4β2 nAChR. Ca 2+ modulation may prevent presynaptic α4β2 nAChRs from overstimulating glutamate release at central excitatory synapses during bouts of synchronous, repetitive activity. Reducing the Ca 2+ dependence of the ACh response could trigger seizures by increasing α4β2‐mediated glutamate release during such bouts.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1113/jphysiol.2003.036681

Cites

60 of 60 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

3 of the 63 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Rodrigues‐Pinguet, N., Jia, L., Li, M., Figl, A., Klaassen, A., Truong, A., Lester, H. A., & Cohen, B. N.
Affiliations
  • University of California, Riverside (US)
  • University of California, Los Angeles (US)
  • California Institute of Technology (US)
Corresponding author
Cohen, Bruce N.
Venue
The Journal of Physiology
Publisher
Wiley
Published
2003-07
Volume
550
Issue
1
Pages
11-26
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W1592246578
Cited by
85
References
63
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 4 · 2016: 2 · 2015: 3 · 2014: 1 · 2013: 3 · 2012: 6
FWCI
2.76
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Funders
National Institute of Neurological Disorders and Stroke (NS43800, NS 11756, R01NS043800, R01NS011756)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Health Sciences › Medicine › Psychiatry and Mental health › Epilepsy research and treatment
Keywords
autosomal dominant nocturnal frontal lobe epilepsy, nicotinic acetylcholine receptors, alpha4beta2 nAChR, calcium block, acetylcholine response, glutamate release, presynaptic receptors, seizure pathogenesis, calcium-activated chloride current
MeSH terms
Acetylcholine, Amino Acid Sequence, Animals, Barium, Calcium, Cell Membrane, Circadian Rhythm, Electric Conductivity, Genes, Dominant, Homeostasis, Molecular Sequence Data, Mutation, Oocytes, Pyridines, Reaction Time, Receptors, Nicotinic, Xenopus laevis, Artifacts, Epilepsy, Frontal Lobe, Chloride Channels, Nicotinic Agonists, Bridged Bicyclo Compounds, Heterocyclic, Rats

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review