Interferon-gamma-inducible subunits are incorporated in human brain 20S proteasome.
In most tissues expressing MHC class I molecules, proteasomes incorporating IFN-gamma-inducible subunits, defined immuno-proteasomes, exist together with constitutive proteasomes. In physiological conditions, the central nervous system expresses neither MHC class I molecules nor TAP1 and TAP2 transporters but besides being constitutive, it is unknown whether immuno-proteasomes are also present in this tissue. We present evidence that in human brain, the two types of proteasome exist suggesting that under physiological conditions, the mechanisms regulating expression of IFN-gamma-inducible subunits as well as of MHC class I molecules and TAP1 and TAP2 transporters in nervous tissue, are not entirely coordinated.
Piccinini
Marco
M
Department of Medicine and Experimental Oncology, Section of Biochemistry, University of Turin, Via Michelangelo 27/b, 10126, Turin, Italy.
Mostert
Michael
M
Croce
Sabrina
S
Baldovino
Simone
S
Papotti
Mauro
M
Rinaudo
Maria Teresa
MT
D017951:Antigen Presentation; D001921:Brain / Q000201:enzymology*; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology*; D007668:Kidney / Q000201:enzymology; D008970:Molecular Weight; D009097:Multienzyme Complexes / Q000378:metabolism*; D010447:Peptide Hydrolases / Q000378:metabolism*; D046988:Proteasome Endopeptidase Complex; D021122:Protein Subunits
D009097:Multienzyme Complexes; D021122:Protein Subunits; D007371:Interferon-gamma; D010447:Peptide Hydrolases; D046988:Proteasome Endopeptidase Complex; C061553:ATP dependent 26S protease