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I in glomerular
mesangial cells is associated with specific NF-
B
subunit translocation
Division of Nephrology, Veterans Affairs Medical Center, and Section of Nephrology, Department of Medicine, Case Western Reserve University, Cleveland, Ohio 44106
Changes
in expression and activity of protein kinase C (PKC) isoforms and early
transcription factors may account for alterations in cell behavior seen
in diabetes. We studied the expression of PKC-
I in rat
glomerular mesangial cells (MCs) cultured in normal or high glucose and
compared it with the temporal and spatial expression of dimeric
transcription factor (NF-
B) p50 and p65. The results show that in
unstimulated cells PKC-
I and NF-
B p50 are distributed
in the cytosol and, on stimulation, their distribution is perinuclear
and they are localized to the membrane. Serum-starved MCs cultured in
high-glucose medium exhibit a predominantly cytosolic localization of
PKC-
I and both p50 and p65 NF-
B. However, phorbol 12-myristate 13-acetate (PMA) stimulation of cells grown in the presence of high glucose resulted in membrane translocation of PKC-
I that was associated with nuclear translocation of
NF-
B p65, but not NF-
B p50. Moreover, the translocation to the
nucleus for NF-
B p65 was significantly higher in MCs exposed to high glucose compared with those exposed to normal glucose. These
observations indicate that the NF-
B p65, but not NF-
B p50,
expression and translocation pattern mirrors that of
PKC-
I, which may be one important pathway by which
signaling is enhanced in the high-glucose state.
protein kinase C; transcriptional factors; diabetes; nephropathy
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