Linked Life Data

1294020

Source:http://linkedlifedata.com/resource/pubmed/id/1294020

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1993-4-8
pubmed:abstractText
Interleukin-6 (IL-6) is a multifunctional cytokine which has been suggested to function as an autocrine mitogen in psoriatic epidermis. We report here the results of several experiments designed to further examine this hypothesis. Blot hybridization was unable to detect 1.3 kb IL-6 transcripts in RNA extracted from normal or psoriatic epidermal (keratome) biopsies, suggesting that IL-6 expression is very low in normal and psoriatic epidermis. Therefore, qualitative and semiquantitative PCR/Southern blot analyses were performed on keratome-derived RNA, and revealed variable but significantly increased IL-6 mRNA levels in lesional psoriatic relative to normal tissue. To further examine the ability of normal human keratinocytes (NHK) to express IL-6, RNA was extracted from rapidly proliferating secondary NHK cultures. IL-6 transcripts were nearly undetectable by blotting in keratinocytes grown in low-calcium serum-free medium, but low levels could be induced by treatment with 1.8 mM CaCl2. IL-6 transcripts were strongly superinduced after cycloheximide treatment, suggesting that a labile protein regulates IL-6 mRNA levels in these cells. Finally, the mitogenic activity of IL-6 was examined in NHK under varying conditions of cell density and added growth factors. IL-6 did not stimulate high density keratinocyte growth in the presence or absence of other growth factors, but did stimulate clonal growth in epidermal growth factor (EGF)-deficient media at high concentrations (> or = 10 ng/ml). The proliferative effects of IL-6, but not of basic fibroblast growth factor, were abrogated by monoclonal antibodies directed against the EGF receptor.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0340-3696
pubmed:author
pubmed:issnType
Print
pubmed:volume
284
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
324-32
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Interleukin-6 in psoriasis: expression and mitogenicity studies.
pubmed:affiliation
Department of Dermatology, University of Michigan, Ann Arbor 48109-0672.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't