Linked Life Data

6698333

Source:http://linkedlifedata.com/resource/pubmed/id/6698333

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1984-4-17
pubmed:abstractText
Recently we reported a low calcium (110 microM) serum-free medium (LHC-1) for clonal growth of normal human bronchial epithelial (NHBE) cells. NHBE cells within colonies are small (mean surface area = 1,250 mu2) rarely migratory, have few tonofilaments, and multiply with an average population doubling time of 28 h. We have also noted that adding small amounts of blood-derived serum to LHC-1 medium (as little as 2%) significantly decreased the clonal growth rate. We have now found that the growth inhibiting effect of serum is due to the induction of squamous (terminal) differentiation. Serum quickly increases the size of the cells (mean surface area = 4,900 mu2). In addition, the cells acquire numerous desmosomal junctions and an extensive network of keratin bundles. In contrast, human lung carcinoma cells multiply rapidly at clonal density in LHC-1 medium containing as much as 8% serum. Although high concentrations of calcium ions in the medium are known to induce squamous differentiation of epidermal keratinocytes in the absence of serum, high levels of Ca2+ (up to 1,000 microM) increased the number of desmosomal junctions, but did not significantly affect the clonal growth rate or size of the NHBE cells. However, high concentrations of calcium (above 450 microM) were found to potentiate serum differentiation-inducing activity. On the other hand, cholera toxin (10 ng/ml) inhibited the differentiation-inducing activity of serum. These results show that squamous differentiation of NHBE cells can be induced by serum and the potency of these serum factors can be modulated. In addition, the data show that lung carcinoma cells differ from their normal counterparts by not undergoing differentiation in the presence of serum.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0301-4681
pubmed:author
pubmed:issnType
Print
pubmed:volume
25
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
229-37
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1984
pubmed:articleTitle
Induction of squamous differentiation of normal human bronchial epithelial cells by small amounts of serum.
pubmed:publicationType
Journal Article, Comparative Study