The role of adenovirus oncogenes in down-regulation of major histocompatibility class I gene expression

1991 ◽  
Vol 19 (2) ◽  
pp. 84S-84S
Author(s):  
ELA SHARMA ◽  
TINA HOLLETT ◽  
MARIA E. BLAIR ZAJDEL ◽  
G. ERIC BLAIR
Keyword(s):  
Gene Expression ◽  
Class I ◽  
Major Histocompatibility ◽  
Down Regulation ◽  
Major Histocompatibility Class ◽  
I Gene ◽  
Major Histocompatibility Class I

Interferons increase transcription of a major histocompatibility class I gene via a 5' interferon consensus sequence

1987 ◽  
Vol 7 (7) ◽  
pp. 2625-2630
Author(s):  
K Sugita ◽  
J Miyazaki ◽  
E Appella ◽  
K Ozato
Keyword(s):  
Consensus Sequence ◽  
Simian Virus 40 ◽  
Simian Virus ◽  
Class I ◽  
Major Histocompatibility ◽  
Major Histocompatibility Class ◽  
Ifn Alpha ◽  
Alpha Beta ◽  
I Gene ◽  
Major Histocompatibility Class I

Interferons (IFNs) augment expression of major histocompatibility class I genes in many cells. To study the effect of IFNs on transcription of class I genes, we prepared and tested activity of chloramphenicol acetyltransferase (CAT) hybrid genes in which the cat gene is under the control of the 5' flanking region of the murine H-2Ld gene. NIH 3T3 cells transiently transfected with a cat construct having the sequence from position -210 to -134 showed a four- to fivefold increase in CAT activity when treated with IFN-alpha/beta. This sequence contains the IFN consensus sequence (ICS) shared among IFN-inducible genes, as well as the class I regulatory element (CRE) that controls up and down regulation of class I gene expression. To determine the precise sequence requirement for the IFN action, the ICS and CRE were independently placed upstream of the class I or a heterologous simian virus 40 promoter, and CAT activity was tested. The ICS, but not the CRE, enhanced activity of both promoters by about twofold upon exposure to IFN-alpha/beta, although greater responses were noted when the ICS and CRE were combined. These results demonstrate that the ICS alone is capable of enhancing promoter activity in response to IFN-alpha/beta treatment and that the CRE exerts a synergistic effect. Further, we show that the ICS functions as an inducible enhancer since it acts regardless of its orientation and distance in the simian virus 40 promoter.

scholarly journals Interferons increase transcription of a major histocompatibility class I gene via a 5' interferon consensus sequence.

1987 ◽  
Vol 7 (7) ◽  
pp. 2625-2630 ◽  
Author(s):  
K Sugita ◽  
J Miyazaki ◽  
E Appella ◽  
K Ozato
Keyword(s):  
Consensus Sequence ◽  
Simian Virus 40 ◽  
Simian Virus ◽  
Class I ◽  
Major Histocompatibility ◽  
Major Histocompatibility Class ◽  
Ifn Alpha ◽  
Alpha Beta ◽  
I Gene ◽  
Major Histocompatibility Class I

Interferons (IFNs) augment expression of major histocompatibility class I genes in many cells. To study the effect of IFNs on transcription of class I genes, we prepared and tested activity of chloramphenicol acetyltransferase (CAT) hybrid genes in which the cat gene is under the control of the 5' flanking region of the murine H-2Ld gene. NIH 3T3 cells transiently transfected with a cat construct having the sequence from position -210 to -134 showed a four- to fivefold increase in CAT activity when treated with IFN-alpha/beta. This sequence contains the IFN consensus sequence (ICS) shared among IFN-inducible genes, as well as the class I regulatory element (CRE) that controls up and down regulation of class I gene expression. To determine the precise sequence requirement for the IFN action, the ICS and CRE were independently placed upstream of the class I or a heterologous simian virus 40 promoter, and CAT activity was tested. The ICS, but not the CRE, enhanced activity of both promoters by about twofold upon exposure to IFN-alpha/beta, although greater responses were noted when the ICS and CRE were combined. These results demonstrate that the ICS alone is capable of enhancing promoter activity in response to IFN-alpha/beta treatment and that the CRE exerts a synergistic effect. Further, we show that the ICS functions as an inducible enhancer since it acts regardless of its orientation and distance in the simian virus 40 promoter.

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