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2018 ; 15
(6
): 5189-5198
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English Wikipedia
Effects of intranasal administration with Bacillus subtilis on immune cells in
the nasal mucosa and tonsils of piglets
#MMPMID29805543
Yang Y
; Jing Y
; Yang J
; Yang Q
Exp Ther Med
2018[Jun]; 15
(6
): 5189-5198
PMID29805543
show ga
The nasal mucosa is the body's first barrier against pathogens entering through
the respiratory tract. The respiratory immune system of pigs has more
similarities with humans than the mouse respiratory system does, and so was
selected as the animal model in the present study. To evaluate the effects of
Bacillus subtilis as a potential probiotic to stimulate local immune responses,
piglets were intranasally administered with Dylight 488-labeled B. subtilis
(WB800-green fluorescent protein). The results revealed that B. subtilis was able
to reach the lamina propria of the nasal mucosa, nasopharyngeal tonsils and soft
palate tonsils. Piglets were subsequently administered intranasally with B.
subtilis (WB800) at 3, 12 and 28 days. The results revealed that, following
administration with B. subtilis, the number of dendritic cells, immunoglobulin
A(+) B cells and T cells in the nasal mucosa and tonsils significantly increased
(P<0.05). No obvious differences were observed in the morphological structure
following B. subtilis administration. There were no statistical differences were
observed in the expression of interleukin (IL)-1?, tumor necrosis factor-? and
IL-8 mRNA between the B. subtilis treated group and the control group in the
nasal mucosa, nasopharyngeal tonsil or soft palate tonsil. Toll-like receptor
(TLR)-2 and TLR-9 mRNA expression in the tonsils was significantly increased
following B. subtilis administration compared with the control group (P<0.05).
The results demonstrate that B. subtilis administration increases the number of
immune cells in the nasal mucosa and tonsils of piglets and stimulates nasal
mucosal and tonsillar immunity. The present study lays the foundation for further
study into the intranasal administration of B. subtilis in humans to enhance the
immunity of human nasal mucosa to respiratory diseases.