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Optogenetic elevation of endogenous glucocorticoid level in larval zebrafish

De Marco, RJ, Groneberg, AH, Yeh, C-M, Ramirez, LAC and Ryu, S (2013) Optogenetic elevation of endogenous glucocorticoid level in larval zebrafish. Frontiers in Neural Circuits, 7. ISSN 1662-5110

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Abstract

The stress response is a suite of physiological and behavioral processes that help to maintain or reestablish homeostasis. Central to the stress response is the hypothalamic-pituitary-adrenal (HPA) axis, as it releases crucial hormones in response to stress. Glucocorticoids (GCs) are the final effector hormones of the HPA axis, and exert a variety of actions under both basal and stress conditions. Despite their far-reaching importance for health, specific GC effects have been difficult to pin-down due to a lack of methods for selectively manipulating endogenous GC levels. Hence, in order to study stress-induced GC effects, we developed a novel optogenetic approach to selectively manipulate the rise of GCs triggered by stress. Using this approach, we could induce both transient hypercortisolic states and persistent forms of hypercortisolaemia in freely behaving larval zebrafish. Our results also established that transient hypercortisolism leads to enhanced locomotion shortly after stressor exposure. Altogether, we present a highly specific method for manipulating the gain of the stress axis with high temporal accuracy, altering endocrine and behavioral responses to stress as well as basal GC levels. Our study offers a powerful tool for the analysis of rapid (non-genomic) and delayed (genomic) GC effects on brain function and behavior, feedbacks within the stress axis and developmental programming by GCs.

Item Type: Article
Uncontrolled Keywords: 1109 Neurosciences
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QL Zoology
Divisions: Biological & Environmental Sciences (new Sep 19)
Publisher: Frontiers Media
Related URLs:
Date Deposited: 01 Oct 2020 09:01
Last Modified: 01 Oct 2020 09:15
DOI or Identification number: 10.3389/fncir.2013.00082
URI: https://researchonline.ljmu.ac.uk/id/eprint/13761

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