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Protein kinase C isoforms in human and rat colonic mucosa.

Abstract：

:The protein kinase C (PKC) family of enzymes plays a key role in the regulation of cellular events, including cell proliferation and differentiation. Work from our laboratory has shown that the effects of dietary fat and fiber on colonic cell proliferation were positively correlated with membrane/cytosol PKC activity ratios (Chapkin et al., 1993, J. Nutr. 123, 649-655). The presence and subcellular distribution of specific PKC isoforms in rat and human colon were therefore determined in cytosolic and membrane extracts. Tissue extracts were probed with antibodies to individual PKC isoforms. PKC alpha, beta, delta, epsilon, and zeta were detected in both rat and human colonic mucosa, while PKC eta was detected in human colonic mucosa only. PKC alpha, beta, and zeta were predominantly localized in the cytosolic fraction, whereas the majority of PKC delta, epsilon, and eta were found in the membrane-associated fraction. Presence of mRNA for individual PKC isoforms was determined by reverse transcriptase PCR (RT-PCR). Using rat colonic mucosa, mRNA for PKC alpha, beta, delta, epsilon, eta, and zeta were detected by RT-PCR with identity confirmed by sequencing. The relative steady-state levels of PKC isoforms in human colon adenocarcinoma as compared with normal colonic mucosa were determined, with adenocarcinomas having higher amounts of cytosolic PKC beta, delta, epsilon, eta, and zeta. PKC isoforms were also detected in viable, exfoliated colonic cells isolated from human feces, demonstrating that this noninvasive method can be utilized to examine PKC expression in colonic cells. These results demonstrate that colonic mucosa expresses both calcium-dependent (classical) and calcium-independent (novel and atypical) PKC isoforms with distinct subcellular distributions for each. The dynamics of these PKC isoforms may have implications in the development of colon carcinogenesis.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Davidson LA,Jiang YH,Derr JN,Aukema HM,Lupton JR,Chapkin RS

doi

10.1006/abbi.1994.1344

subject

Has Abstract

pub_date

1994-08-01 00:00:00

pages

547-53

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(84)71344-0

journal_volume

312

pub_type

杂志文章

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