Melanin-concentrating hormone in the Locus Coeruleus aggravates helpless behavior in stressed rats
| Autor: | Samia R. L. Joca, Jessika Urbanavicius, Pablo Torterolo, Sara Fabius, Cecilia Scorza, Aline Lulho Roncalho |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Dorsal Raphe Nucleus
Male medicine.medical_specialty Melanin-concentrating hormone Emotions Neurociencias Prefrontal Cortex Learned helplessness Biology Prefrontal cortex Norepinephrine 03 medical and health sciences Behavioral Neuroscience chemistry.chemical_compound 0302 clinical medicine Neurochemical Learned Helplessness Internal medicine medicine Animals Receptors Somatostatin Rats Wistar Microinjection Forced swimming test 030304 developmental biology Melanins Neurons Ciencias Médicas y de la Salud 0303 health sciences Hypothalamic Hormones Depression CÓRTEX PRÉ-FRONTAL respiratory system Antidepressive Agents Rats Pituitary Hormones Medicina Básica Endocrinology chemistry Noradrenaline Locus coeruleus Locus Coeruleus Animal studies Stress Psychological 030217 neurology & neurosurgery hormones hormone substitutes and hormone antagonists Behavioural despair test |
| Zdroj: | Behavioural Brain Research 374:112120 REDI Instituto de Investigaciones Biológicas Clemente Estable instacron:Instituto de Investigaciones Biológicas Clemente Estable Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Animal studies have shown that antagonists of receptor 1 of Melanin-Concentrating Hormone (MCH-R1) elicit antidepressive-like behavior, suggesting that MCH-R1 might be a novel target for the treatment of depression and supports the hypothesis that MCHergic signaling regulates depressive-like behaviors. Consistent with the evidence that MCHergic neurons send projections to dorsal and median raphe nuclei, we have previously demonstrated that MCH microinjections in both nuclei induced a depressive-like behavior. Even though MCH neurons also project to Locus coeruleus (LC), only a few studies have reported the behavioral and neurochemical effect of MCH into the LC. We studied the effects of MCH (100 and 200 ng) into the LC on coping-stress related behaviors associated with depression, using two different behavioral tests: the forced swimming test (FST) and the learned helplessness (LH). To characterize the functional interaction between MCH and the noradrenergic LC system, we also evaluated the neurochemical effects of MCH (100 ng) on the extracellular levels of noradrenaline (NA) in the medial prefrontal cortex (mPFC), an important LC terminal region involved in emotional processing. MCH administration into the LC elicited a depressive-like behavior evidenced in both paradigms. Interestingly, in the LH, MCH (100) elicited a significant increase in escape failures only in stressed animals. A significant decrease in prefrontal levels of NA was observed after MCH microinjection into the LC. Our results demonstrate that increased MCH signaling into the LC triggers depressive-like behaviors, especially in stressed animals. These data further corroborate the important role of MCH in the neurobiology of depression. Agencia Nacional de Investigación e Innovación Programa de Desarrollo de las Ciencias Básicas |
| Databáze: | OpenAIRE |
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