Abstract:
BACKGROUND:Naphthalene-induced respiratory tract toxicity in mice is characterized by specific and rapid loss of the Clara cell population, which is restored only after several days. The sources of restoration of this cell population remain unclear. We investigated whether BM-derived cells participated in the process of epithelial restoration following naphthalene toxicity compared with bacterial infection. We further investigated the role of BM-derived cells in restoration of expression of peroxiredoxin V (PRXV), one of the major proteins of antioxidant defense, specifically expressed in the bronchial epithelium. METHODS:We transplanted GFP-tagged BM cells into 5 Gy-irradiated C57BL/6 recipients. Following 1 month of recovery, experimental animals were subjected to 250 mg/kg naphthalene i.p. An additional group of animals received intratracheal instillation of Escherichia coli to induce acute bacterial inflammation. Animals were killed at 1-12 days after naphthalene and analyzed immunohistochemically. RESULTS:Recipients' cells of bronchial epithelium demonstrated significantly reduced levels of PRXV expression following naphthalene. In animals with acute bacterial inflammation, PRXV levels were not reduced in epithelium and participation of BM-derived cells in epithelial restoration was minimal. Following naphthalene, GFP(+) cells were present in large numbers in lung parenchyma and epithelium of conducting airways starting at 1 day following injury. GFP(+) progeny of BM cells was the major source of PRXV in the epithelium. DISCUSSION:These data suggest that BM-derived cells may provide a source of antioxidant protection of airways by expression of PRXV in a model of acute epithelial respiratory tract toxicity.
journal_name
Cytotherapyjournal_title
Cytotherapyauthors
Serikov VB,Popov BV,Kropotov AV,Tomilin NVdoi
10.1080/14653240500361012keywords:
subject
Has Abstractpub_date
2005-01-01 00:00:00pages
483-93issue
6eissn
1465-3249issn
1477-2566pii
P684855K60735615journal_volume
7pub_type
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