Abstract:
:Early biochemical changes associated with adjuvant stimulation of macrophage protein synthesis were studied using two murine macrophage cell lines, PU5-1.8 and J774.1. An induction of ornithine decarboxylase (ODC) was detected 2 hours after exposure of PU5-1.8 and J774.1 cells to two crude immunoadjuvants, BCG cell walls (BCGcw) and lipopolysaccharides from Escherichia coli (LPS). The chemically defined immunoadjuvant glycopeptide, N-acetyl-muramyl-L-alanyl-D-isoglutamine (MDPL) also promoted an increase in ODC activity at 2 hours that was maximal after 4 hours, while little or no effect was observed with the D-alanyl analog (MDPD) that is devoid of adjuvant activity. The increase in ODC activity promoted by BCGcw in PU5-1.8 and J774.1 cells returned toward control levels by 6 to 8 hours. BCGcw also stimulated RNA and protein synthesis which remained elevated for at least 24 hours and was associated with a decrease in DNA synthesis and cell proliferation. ODC induction by BCGcw and MDPL was enhanced by the addition of PGE2 in both cell lines. Indomethacin slightly depressed the magnitude of ODC stimulation by BCGcw in J774.1 cells but failed to alter the response of PU5-1.8 cells. Additional observations indicated that the induction of ODC by BCGcw in both cell lines was preceded by an activation of cyclic AMP-dependent protein kinase. These observations suggest that a cyclic AMP-mediated induction of ODC may be an early biochemical marker of adjuvant stimulation in macrophages.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Prosser FH,Schmidt CJ,Nichols SV,Nichols WKdoi
10.1002/jcp.1041200111subject
Has Abstractpub_date
1984-07-01 00:00:00pages
75-82issue
1eissn
0021-9541issn
1097-4652journal_volume
120pub_type
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