Peripheral benzodiazepine receptor modulation with phagocyte differentiation.
Peripheral benzodiazepine receptor (PBR) was found to be less expressed in the immature phagocytic HL-60 and U-937 cell lines than in the more mature monocytic THP-1 cell line. Cell differentiation by several agents induced a strong enhancement of PBR density on these three phagocytic cell lines but not on the lymphocytic CEM cell line. Detailed analysis of phorbol 12-myristate 13-acetate-treated THP-1 cells showed an increased PBR expression and the rise came along with an increase of CD11a and CD11b antigens and a secretion of macrophagic cytokines tumor necrosis factor-alpha (TNF-alpha), interleukin (IL)-1 beta and IL-8. Quantitation of mRNA using polymerase chain reaction (PCR)-based technique showed that overexpression of PBR did not parallel mRNA expression, indicating a gene-independent regulation. These results suggest that PBR predominance on phagocytic cells could be related to maturation process.
Immunopharmacology Department, Elf-Sanofi Recherche, Montpellier, France.
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X
Canat
A
A
Guillaumont
M
M
Bouaboula
C
C
Poinot-Chazel
J M
JM
Derocq
P
P
Carayon
G
G
LeFur
P
P
Casellas
D015703:Antigens, CD / Q000032:analysis; D001665:Binding Sites / Q000187:drug effects; D002454:Cell Differentiation; D002460:Cell Line; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology; D007375:Interleukin-1 / Q000032:analysis; D016209:Interleukin-8 / Q000032:analysis; D010586:Phagocytes / Q000187:drug effects / Q000378:metabolism*; D012333:RNA, Messenger / Q000032:analysis; D011963:Receptors, GABA-A / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis
D015703:Antigens, CD; D007375:Interleukin-1; D016209:Interleukin-8; D012333:RNA, Messenger; D011963:Receptors, GABA-A; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma; D013755:Tetradecanoylphorbol Acetate; D004121:Dimethyl Sulfoxide