Linked Life Data

17897770

Source:http://linkedlifedata.com/resource/pubmed/id/17897770

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
2007-10-26
pubmed:abstractText
Hydroquinone (HQ) is naturally found in the diet, drugs, as an environmental contaminant and endogenously generated after benzene exposure. Considering that HQ alters the immune system and its several source of exposures in the environment, we hypothesized that prolonged exposure of HQ could affect the course of an immune-mediated inflammatory response. For this purpose, male Wistar rats were intraperitoneally exposed to vehicle or HQ once a day, for 22 days with a 2-day interval every 5 days. On day 10 after exposure with vehicle or HQ, animals were ovalbumin (OA)-sensitized and OA-aerosolized challenged on day 23. HQ exposure did not alter the number of circulating leukocytes but impaired allergic inflammation, evidenced by lower number of leukocytes in the bronchoalveolar lavage fluid 24h after OA-challenge. Reduced force contraction of ex vivo tracheal segments upon OA-challenge and impaired mesentery mast cell degranulation after in situ OA-challenge were also detected in tissues from HQ exposed animals. The OA-specificity on the decreased responses was corroborated by normal trachea contraction and mast cell degranulation in response to compound 48/80. In fact, lower levels of circulating OA-anaphylactic antibodies were found in HQ exposed rats, as assessed by passive cutaneous anaphylaxis assay. The reduced level of OA-anaphylactic antibody was not dependent on lower number or proliferation of lymphocytes. Nevertheless, lower expression of the co-stimulatory molecules CD6 and CD45R on OA-activated lymphocytes from HQ exposed rats indicate the interference of HQ exposure with signaling of the humoral response during allergic inflammation. Together, these data indicate specific effects of HQ exposure manifested during an immune host defense.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0300-483X
pubmed:author
pubmed:issnType
Print
pubmed:day
20
pubmed:volume
241
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
47-57
pubmed:meshHeading
pubmed-meshheading:17897770-Alveolitis, Extrinsic Allergic, pubmed-meshheading:17897770-Animals, pubmed-meshheading:17897770-Antigens, CD, pubmed-meshheading:17897770-Antigens, CD45, pubmed-meshheading:17897770-Antigens, Differentiation, T-Lymphocyte, pubmed-meshheading:17897770-Bronchoalveolar Lavage Fluid, pubmed-meshheading:17897770-Cell Degranulation, pubmed-meshheading:17897770-Cell Proliferation, pubmed-meshheading:17897770-Environmental Pollutants, pubmed-meshheading:17897770-Flow Cytometry, pubmed-meshheading:17897770-Hydroquinones, pubmed-meshheading:17897770-Leukocyte Count, pubmed-meshheading:17897770-Lymphocytes, pubmed-meshheading:17897770-Male, pubmed-meshheading:17897770-Mast Cells, pubmed-meshheading:17897770-Muscle, Smooth, pubmed-meshheading:17897770-Muscle Contraction, pubmed-meshheading:17897770-Neutrophil Infiltration, pubmed-meshheading:17897770-Ovalbumin, pubmed-meshheading:17897770-Passive Cutaneous Anaphylaxis, pubmed-meshheading:17897770-Rats, pubmed-meshheading:17897770-Rats, Wistar, pubmed-meshheading:17897770-Spleen, pubmed-meshheading:17897770-Trachea
pubmed:year
2007
pubmed:articleTitle
In vivo hydroquinone exposure impairs allergic lung inflammation in rats.
pubmed:affiliation
Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't