Ingestion of Lactobacillus strain regulates emotional behavior and central GABA receptor expression in a mouse via the vagus nerve.
Javier A. Bravo,Paul Forsythe,Marianne V. Chew,Emily Escaravage,Hélène M. Savignac,Timothy G. Dinan,John Bienenstock,John F. Cryan +7 more
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TLDR
Chronic treatment with L. rhamnosus induced region-dependent alterations in GABAB1b mRNA in the brain with increases in cortical regions and concomitant reductions in expression in the hippocampus, amygdala, and locus coeruleus, in comparison with control-fed mice, highlighting the important role of bacteria in the bidirectional communication of the gut–brain axis.Abstract:
There is increasing, but largely indirect, evidence pointing to an effect of commensal gut microbiota on the central nervous system (CNS). However, it is unknown whether lactic acid bacteria such as Lactobacillus rhamnosus could have a direct effect on neurotransmitter receptors in the CNS in normal, healthy animals. GABA is the main CNS inhibitory neurotransmitter and is significantly involved in regulating many physiological and psychological processes. Alterations in central GABA receptor expression are implicated in the pathogenesis of anxiety and depression, which are highly comorbid with functional bowel disorders. In this work, we show that chronic treatment with L. rhamnosus (JB-1) induced region-dependent alterations in GABAB1b mRNA in the brain with increases in cortical regions (cingulate and prelimbic) and concomitant reductions in expression in the hippocampus, amygdala, and locus coeruleus, in comparison with control-fed mice. In addition, L. rhamnosus (JB-1) reduced GABAAα2 mRNA expression in the prefrontal cortex and amygdala, but increased GABAAα2 in the hippocampus. Importantly, L. rhamnosus (JB-1) reduced stress-induced corticosterone and anxiety- and depression-related behavior. Moreover, the neurochemical and behavioral effects were not found in vagotomized mice, identifying the vagus as a major modulatory constitutive communication pathway between the bacteria exposed to the gut and the brain. Together, these findings highlight the important role of bacteria in the bidirectional communication of the gut–brain axis and suggest that certain organisms may prove to be useful therapeutic adjuncts in stress-related disorders such as anxiety and depression.read more
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Modulation of Gut Microbiota-Brain Axis by Probiotics, Prebiotics, and Diet.
TL;DR: Recent findings in the relationship between intestinal microbes and brain function, such as anxiety, depression, stress, autism, learning, and memory are reviewed.
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Gut microbiota and gastrointestinal health: current concepts and future directions.
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Microbiota regulation of the Mammalian gut-brain axis.
TL;DR: Understanding microbiota-brain interactions is an exciting area of research which may contribute new insights into individual variations in cognition, personality, mood, sleep, and eating behavior, and how they contribute to a range of neuropsychiatric diseases ranging from affective disorders to autism and schizophrenia.
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Neurotransmitters as food supplements: the effects of GABA on brain and behavior.
Evert Boonstra,Roy de Kleijn,Lorenza S. Colzato,Anneke Alkemade,Birte U. Forstmann,Birte U. Forstmann,Sander Nieuwenhuis +6 more
TL;DR: It is suggested that any veridical effects of GABA food supplements on brain and cognition might be exerted through BBB passage or, more indirectly, via an effect on the enteric nervous system.
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