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Parenteral Nutrition Maintains Pulmonary IgA Antibody Transport Capacity, but Not Active Transport, Following Injury

Overview
Journal Am J Surg
Specialty General Surgery
Date 2009 Mar 3
PMID 19249732
Citations 14
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Abstract

Background: Parenteral nutrition (PN) increases post-trauma pneumonia versus enteral feeding. PN impairs murine immunoglobulin A (IgA) airway defenses and abrogates a normal IgA increase following injury. This work investigates the effect of type/route of nutrition on lung IgA and its transport protein, polymeric immunoglobulin receptor (pIgR), after injury.

Methods: Catheterized mice were randomized to Chow or PN for 5 days and sacrificed without injury (Chow: n = 12; PN n = 11), or 8 hours after laparotomy + neck incisions (Chow-injury: n = 11, PN-injury: n = 13). Bronchoalveolar lavage (BAL) and lung IgA levels were analyzed by enzyme-linked immunosorbent assay (ELISA) and lung pIgR by Western blot.

Results: BAL IgA levels increased in Chow-injury versus PN-injury (P <.01) with no differences in pIgR. PN-injury tissue IgA levels decreased versus Chow (P <.01), Chow-injury (P <.01), and PN (P <.05).

Conclusions: PN impairs the airway IgA response to injury but not due to impaired IgA transport capacity/pIgR level.

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