Format

Send to

Choose Destination
J Nutr. 2019 Jun 7. pii: nxz105. doi: 10.1093/jn/nxz105. [Epub ahead of print]

Lactobacillus acidophilus Exerts Neuroprotective Effects in Mice with Traumatic Brain Injury.

Ma Y1,2, Liu T2, Fu J1, Fu S1, Hu C1, Sun B1, Fan X2, Zhu J1.

Author information

1
Department of Basic Nursing, School of Nursing, Third Military Medical University (Army Medical University), Chongqing, China.
2
Department of Developmental Neuropsychology, School of Psychology, Third Military Medical University (Army Medical University), Chongqing, China.

Abstract

BACKGROUND:

Traumatic brain injury (TBI) causes dysbiosis and intestinal barrier disruption, which further exacerbate brain damage via an inflammatory pathway. Gut microbiota remodeling by Lactobacillus acidophilus (LA) is a potential intervention.

OBJECTIVE:

The aim of this study was to investigate the neuroprotective effects of LA in TBI and elucidated underlying mechanisms.

METHODS:

C57BL/6 male mice (aged 8-9 wk) were subjected to weight-drop impact and gavaged with saline (TBI + vehicle) or LA (1 × 1010 CFU) (TBI + LA) on the day of injury and each day after for 1, 3, or 7 d. The sham + vehicle mice underwent craniotomy without brain injury and were gavaged with saline. Sensorimotor functions were determined pre-TBI and 1, 3, and 7 d postinjury. Indexes of neuroinflammation, peripheral inflammation, and intestinal barrier function were measured on days 3 and 7. Microbiota composition was measured 3 d postinjury. The data were mainly analyzed by 2-factor ANOVA.

RESULTS:

Compared with sham + vehicle mice, the TBI + vehicle mice exhibited impairments in the neurological severity score (+692%, day 3; +600%, day 7) and rotarod test (-58%, day 3; -45%, day 7) (P < 0.05), which were rescued by LA. The numbers of microglia (total and activated) and astrocytes and concentrations of TNF-α and IL1-β in the perilesional cortex were elevated in the TBI + vehicle mice on day 3 or 7 compared with sham + vehicle mice (P < 0.05) and were normalized by LA. Compared with sham + vehicle mice, the TBI + vehicle mice exhibited increased serum concentrations of endotoxin and TNF-α, and intestinal barrier permeability (D-lactate) on days 3 and 7 (P < 0.05), and these changes were alleviated by LA. Three days postinjury, the microbiota composition was disrupted in the TBI + vehicle mice compared with sham + vehicle mice (P < 0.05), which was restored by LA.

CONCLUSION:

Our results demonstrate that LA exerts neuroprotective effects that may be associated with gut microbiota remodeling in TBI mice.

KEYWORDS:

Lactobacillus acidophilus ; gut microbiota; intestinal barrier; neuroprotection; traumatic brain injury

PMID:
31174208
DOI:
10.1093/jn/nxz105

Supplemental Content

Full text links

Icon for Silverchair Information Systems
Loading ...
Support Center