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2014 ; 260
(3
): 432-43; discussion 443-4
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The enteric nervous system neuropeptide, bombesin, reverses innate immune
impairments during parenteral nutrition
#MMPMID25115419
Busch RA
; Heneghan AF
; Pierre JF
; Wang X
; Kudsk KA
Ann Surg
2014[Sep]; 260
(3
): 432-43; discussion 443-4
PMID25115419
show ga
BACKGROUND: Lack of enteral stimulation during parenteral nutrition (PN) impairs
mucosal immunity. Bombesin (BBS), a gastrin-releasing peptide analogue, reverses
PN-induced defects in acquired immunity. Paneth cells produce antimicrobial
peptides (AMPs) of innate immunity for release after cholinergic stimulation.
OBJECTIVE: Determine if BBS restores AMPs and bactericidal function during PN.
METHODS: Intravenously cannulated male ICR mice were randomized to Chow, PN, or
PN+BBS (15 ?g 3 times daily, n = 7 per group) for 5 days. Ileum was analyzed for
AMPs (Protein: sPLA2 by fluorescence, lysozyme and RegIII-? by western
andcryptdin-4 by ELISA; mRNA: all by RT-PCR). Cholinergic stimulated (100 ?M
bethanechol) ileal specimens assessed Pseudomonas bactericidal activity. Ileum
(Chow: n = 7; PN: n = 9; PN+BBS: n = 8) was assessed for Escherichia coli
invasion in ex-vivo culture. RESULTS: PN significantly decreased most AMPs versus
Chow while BBS maintained Chow levels (sPLA2: Chow: 107 + 14*, PN: 44.6 + 7.2,
PN+BBS: 78.7 + 13.4* Fl/min/?L/total protein; Lysozyme: Chow: 63.9 + 11.9*, PN:
26.8 + 6.2; PN+BBS: 64.9 + 13.8* lysozyme/total protein; RegIII-?: Chow: 51.5 +
10.0*, PN: 20.4 + 4.3, PN+BBS: 31.0 + 8.4 RegIII-?/total protein; Cryptdin-4:
Chow: 18.4 + 1.5*, PN: 12.7 + 1.6, PN+BBS: 26.1 + 2.4*? pg/mg [all *P < 0.05 vs
PN and ?P < 0.05 vs Chow]). Functionally, BBS prevented PN loss of bactericidal
activity after cholinergic stimulation (Chow: 25.3 + 3.6*, PN: 13.0 + 3.2;
PN+BBS: 27.0 + 4.7* percent bacterial killing, *P < 0.05 vs PN). BBS reduced
bacterial invasion in unstimulated tissue barely missing significance (P = 0.06).
CONCLUSIONS: The enteric nervous system (ENS) controls AMP levels in Paneth cells
during PN but mucosal protection by innate immunity requires both ENS and
parasympathetic stimulation.