Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 24 (1994), S. 0 
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. Fibroblasts have been implicated as culture-competent cells for the mast cell lineage in several species. In man, fibroblast monolayers sustain the ultrastructural phenotype and function of isolated human lung mast cells and permit the differentiation and full maturation of human mast cells from their agranular precursors in cord blood cells. We examined whether development and maturation of the mast cell lineage in man can be achieved by a supply of the soluble products present in fibroblast culture supernatants. Suspension cultures of cord blood cells were supplemented with culture supernatants derived from two different murine fibroblast lines; controls were not supplemented. The cultures were sampled for light and electron microscopy at 6, 7 and 8 weeks. Human mast cells developed in quantity when cultures were supplemented with the supernatants from BALB/c 3T3 fibroblasts, in reduced numbers when supplemented with Swiss Albino 3T3 fibroblast supernatants, and not at all in culture media alone. By ultrastructural criteria, the newly developed mast cells did not achieve full maturity; they did continue to synthesize new granules and to undergo intragranular maturational events. Small numbers of mature basophils persisted in suspension cultures, and many were undergoing piecemeal degranulation. Other cell lineages noted included eosinophils, neutrophils, macrophages and endothelial cells. We conclude that a factor(s) of fibroblast origin permits the differentiation and partial maturation of human mast cells from their agranular precursors in cord blood, but that fibroblasts must be physically present for complete maturation of these lineages to occur.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1617-4623
    Keywords: Kinesin-related gene ; Gene family ; Arabidopsis thaliana ; Nucleotide sequence ; Secondary structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A gene family, designated kat, has been characterized in Arabidopsis thaliana by genomic Southern hybridization and nucleotide sequencing analysis. The kat gene family includes at least five members, named katA, katB, katC, katD and katE, whose products share appreciable sequence similarities in their presumptive ATP-binding and microtubule-binding motifs with known kinesin-like proteins. The carboxyl-terminal region of the KatA protein deduced from the nucleotide sequence of the cDNA clone has considerable homology with the mechanochemical motor domain of the kinesin heavy chain. The predicted secondary structure of the KatA protein indicates two globular domains separated by a long a helical coiled coil with heptad repeat structures, such as are commonly found in kinesin-like proteins.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...