Partial chemogenetic inhibition of the locus coeruleus due to heterogeneous transduction of noradrenergic neurons preserved auditory salience processing in wild-type rats.

Publisher: Wiley-Blackwell Country of Publication: France NLM ID: 8918110 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1460-9568 (Electronic) Linking ISSN: 0953816X NLM ISO Abbreviation: Eur J Neurosci Subsets: MEDLINE

Publication: : Oxford : Wiley-Blackwell
Original Publication: Oxford, UK : Published on behalf of the European Neuroscience Association by Oxford University Press, c1989-

Locus Coeruleus*/drug effects ; Locus Coeruleus*/physiology ; Locus Coeruleus*/metabolism ; Adrenergic Neurons*/drug effects ; Adrenergic Neurons*/physiology ; Adrenergic Neurons*/metabolism; Animals ; Rats ; Male ; Clozapine/pharmacology ; Clozapine/analogs & derivatives ; Reflex, Startle/drug effects ; Reflex, Startle/physiology ; Clonidine/pharmacology ; Adrenergic alpha-2 Receptor Agonists/pharmacology ; Transduction, Genetic ; Prepulse Inhibition/drug effects ; Prepulse Inhibition/physiology ; Auditory Perception/physiology ; Auditory Perception/drug effects ; Rats, Sprague-Dawley ; Adenoviruses, Canine ; Genetic Vectors

The acoustic startle reflex (ASR) and prepulse inhibition of the ASR (PPI) assess the efficiency of salience processing, a fundamental brain function that is impaired in many psychiatric conditions. Both ASR and PPI depend on noradrenergic transmission, yet the modulatory role of the locus coeruleus (LC) remains controversial. Clonidine (0.05 mg/kg, i.p.), an alpha2-adrenoreceptor agonist, strongly reduced the ASR amplitude. In contrast, chemogenetic LC inhibition only mildly suppressed the ASR and did affect the PPI in virus-transduced rats. The canine adenovirus type 2 (CAV2)-based vector carrying a gene cassette for the expression of inhibitory receptors (hM4Di) and noradrenergic cell-specific promoter (PRSx8) had high cell-type specificity (94.4 ± 3.1%) but resulted in heterogeneous virus transduction of DbH-positive LC neurons (range: 9.2-94.4%). Clozapine-N-oxide (CNO; 1 mg/kg, i.p.), a hM4Di actuator, caused the firing cessation of hM4Di-expressing LC neurons, yet complete inhibition of the entire population of LC neurons was not achieved. Case-based immunohistochemistry revealed that virus injections distal (> 150 μm) to the LC core resulted in partial LC transduction, while proximal (< 50 μm) injections caused neuronal loss due to virus neurotoxicity. Neither the ASR nor PPI differed between the intact and virus-transduced rats. Our results suggest that a residual activity of virus-non-transduced LC neurons might have been sufficient for mediating an unaltered ASR and PPI. Our study highlights the importance of a case-based assessment of the virus efficiency, specificity, and neurotoxicity for targeted cell populations and of considering these factors when interpreting behavioral effects in experiments employing chemogenetic modulation.
(© 2024 The Author(s). European Journal of Neuroscience published by Federation of European Neuroscience Societies and John Wiley & Sons Ltd.)

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Max-Planck-Gesellschaft

Keywords: acoustic startle reflex; canine adenovirus; clonidine; prepulse inhibition; sensorimotor gating

J60AR2IKIC (Clozapine)
MN3L5RMN02 (Clonidine)
0 (Adrenergic alpha-2 Receptor Agonists)
MZA8BK588J (clozapine N-oxide)

Date Created: 20240930 Date Completed: 20241104 Latest Revision: 20241104

20241104

10.1111/ejn.16550

39349382