Abstract:
:Production of interleukin-12 (IL-12), a heterodimer of p35 and p40 subunits, is limited by p35 expression. A long and a short murine p35 mRNA potentially encoding proteins differing in pre-sequence size are produced. Increased pre-sequence size could convert a cleaved signal peptide to an uncleaved signal peptide, raising the possibility that a membrane-bound form of p35 is produced. The intracellular localization of the p35 encoded by each mRNA isoform was determined by constructing cDNAs containing the long or short p35 cDNA isoform fused in-frame to a cDNA encoding green fluorescent protein (GFP). After transfection of a CV-1 African green monkey kidney cell line with the constructs, confocal microscopy and immunoblotting of extracted microsomal membranes demonstrated that the p35-GFP fusion protein encoded by the long or short mRNA accumulates in the Golgi apparatus as an endoglycosidase H-sensitive glycosylated integral membrane protein. In contrast, a p40-GFP fusion protein accumulates in the Golgi apparatus as a soluble protein. Since assembly of the p35 and p40 subunits to form bioactive IL-12 occurs in the ER, release of membrane-tethered IL-12 by proteolytic cleavage in a late Golgi or post-Golgi compartment may represent an as yet unidentified level at which bioactive IL-12 secretion is regulated.
journal_name
Cytokinejournal_title
Cytokineauthors
Vaidyanathan H,Zhou Y,Petro TM,Schwartzbach SDdoi
10.1016/s1043-4666(03)00016-4keywords:
subject
Has Abstractpub_date
2003-02-07 00:00:00pages
120-8issue
3eissn
1043-4666issn
1096-0023pii
S1043466603000164journal_volume
21pub_type
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