Cited by 361Parkinson's Disease Mechanisms and TreatmentsNuclear Receptors and SignalingNeurotransmitter Receptor Influence on Behavior

Cell type-specific gene expression of midbrain dopaminergic neurons reveals molecules involved in their vulnerability and protection

Open access
Chung, Chee Yeun, Seo, Hyemyung, Sonntag, Kai Christian, Brooks, Andrew, Lin, Ling, Isacson, Ole·2005·Human Molecular Genetics

Abstract

Molecular differences between dopamine (DA) neurons may explain why the mesostriatal DA neurons in the A9 region preferentially degenerate in Parkinson's disease (PD) and toxic models, whereas the adjacent A10 region mesolimbic and mesocortical DA neurons are relatively spared. To characterize innate physiological differences between A9 and A10 DA neurons, we determined gene expression profiles in these neurons in the adult mouse by laser capture microdissection, microarray analysis and real-time PCR. We found 42 genes relatively elevated in A9 DA neurons, whereas 61 genes were elevated in A10 DA neurons [> 2-fold; false discovery rate (FDR) < 1%]. Genes of interest for further functional analysis were selected by criteria of (i) fold differences in gene expression, (ii) real-time PCR validation and (iii) potential roles in neurotoxic or protective biochemical pathways. Three A9-elevated molecules [G-protein coupled inwardly rectifying K channel 2 (GIRK2), adenine nucleotide translocator 2 (ANT-2) and the growth factor IGF-1] and three A10-elevated peptides (GRP, CGRP and PACAP) were further examined in both alpha-synuclein overexpressing PC12 (PC12-alphaSyn) cells and rat primary ventral mesencephalic (VM) cultures exposed to MPP+ neurotoxicity. GIRK2-positive DA neurons were more vulnerable to MPP+ toxicity and overexpression of GIRK2 increased the vulnerability of PC12-alphaSyn cells to the toxin. Blocking of ANT decreased vulnerability to MPP+ in both cell culture systems. Exposing cells to IGF-1, GRP and PACAP decreased vulnerability of both cell types to MPP+, whereas CGRP protected PC12-alphaSyn cells but not primary VM DA neurons. These results indicate that certain differentially expressed molecules in A9 and A10 DA neurons may play key roles in their relative vulnerability to toxins and PD.

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 · 10.1093/hmg/ddi178

Cites

94 of 94 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?

  • Bulk profiling experiments comparing substantia nigra pars compacta and ventral tegmental area neurons yielded gene expression differences but could not distinguish heterogeneous populations within each anatomical cluster.

    “Bulk profiling experiments comparing SNc and VTA neurons did indeed yield some interesting gene expression differences [6–9], but suffered from the caveat that they could not distinguish heterogeneous populations within each anatomical cluster.”

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

Cited by

Sorted by citations

Authors
Chung, C. Y., Seo, H., Sonntag, K. C., Brooks, A., Lin, L., & Isacson, O.
Affiliations
  • Harvard University (US)
  • University of Rochester Medicine (US)
Venue
Human Molecular Genetics
Published
2005-05-11
Volume
14
Issue
13
Pages
1709-1725
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2158662449
Cited by
361
References
94
Citations by year
2026: 5 · 2025: 12 · 2024: 13 · 2023: 17 · 2022: 14 · 2021: 10 · 2020: 17 · 2019: 21 · 2018: 11 · 2017: 23 · 2016: 16 · 2015: 17 · 2014: 24 · 2013: 14 · 2012: 19
FWCI
12.98
Type
journal article
Language
en
Open access
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (P50NS039793)
  • Medical Research and Materiel Command
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nuclear Receptors and Signaling
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
midbrain dopaminergic neurons, Parkinson's disease, cell type-specific gene expression, MPP+ neurotoxicity, neuroprotection, GIRK2, insulin-like growth factor I, GRP, calcitonin gene-related peptide, PACAP, alpha-synuclein overexpression, PC12 cells, ventral mesencephalon, neuronal vulnerability
MeSH terms
Animals, Dopamine, Gene Expression Regulation, Herbicides, Mesencephalon, Neurons, Parkinson Disease, 1-Methyl-4-phenylpyridinium, PC12 Cells, MPTP Poisoning, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling, Mice, 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