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Abstract Title:

Effects of infant formula on cell homeostasis and cytokine levels in an in vivo and in vitro murine aspiration model.

Abstract Source:

Pediatr Pulmonol. 2011 Sep ;46(9):927-33. Epub 2011 Apr 25. PMID: 21520431

Abstract Author(s):

Derek L Pepiak, Joseph L Alcorn, Constance L Atkins, Hasen Xue, Giuseppe N Colasurdo, Amir M Khan

Article Affiliation:

Departments of Pediatrics and Surgery, University of Texas, Houston Medical School, Houston, Texas, USA. dpepia@lsuhsc.edu

Abstract:

RATIONALE: The role of infant formula aspiration in lung injury has not been studied extensively. We evaluated the effects of a single infant formula aspiration into the lungs of mice and the effect of infant formula exposure on cell lines representing murine alveolar macrophages and type II epithelial cells.

OBJECTIVES: To study the effects of exposure to infant formula on cell count histology and cytokine levels in an in vivo and in vitro model of aspiration.

METHODS: In vivo: Juvenile mice received 2.5 µl/g of 50% infant formula intranasally. Bronchoalveolar lavage samples were collected at 1, 2, and 7 days after aspiration and evaluated for cell count and differential. In vitro: RAW 264.7 and MLE-15 cells were exposed to 1% infant formula for 6 hr. Extracellular levels of IL-6, TNF-α, MIP-2, and KC were measured in lavage fluid and cell media using ELISA assays.

RESULTS: In vivo: An increase in neutrophils, IL-6 and KC levels were noted 24 hr after infant formula exposure. In vitro: An increase in TNF-α levels from RAW 264.7 and MIP-2 and KC levels from MLE-15 cells was noted after infant formula exposure.

CONCLUSIONS: A single aspiration of infant formula into the lungs leads to an acute inflammatory response involving both lung macrophages and epithelial cells.

Study Type : Animal Study
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