Abstract
Alteration of gene expression by inorganic arsenic has been studied in cultured human keratinocytes derived from normal epidermis, a premalignant lesion and a malignant tumor. The purpose was to find whether these cells displayed common alterations in gene expression that might elucidate the mechanism of arsenic action. Global analysis of ∼12 000 genes by microarray showed that ∼30% were expressed. Of these, transcription of a substantial fraction (up to 12%) was altered, nearly twice as many being suppressed as stimulated by 2-fold or more at 2 μM sodium arsenite or 6 μM arsenate, which did not affect cell growth. At 0.67 μM arsenite (50 p.p.b.), effects on transcription were less pronounced but clearly evident. Genes whose transcription was altered in common among all the treated keratinocytes included those induced by reactive oxygen, of which heme oxygenase-1 displayed the highest fold induction. Genes indicative of reactive oxygen generation were detected at the earliest time examined, raising the possibility this feature drives subsequent cellular responses. Unlike some agents that produced transient induction of heme oxygenase-1, arsenicals produced sustained induction. Comparison with other agents producing reactive oxygen in the cells, as reflected in heme oxygenase-1 induction, suggested cellular differentiation was suppressed by sustained but not transient generation of reactive oxygen. Sustained global changes in gene expression were seen in target cells treated chronically with inorganic arsenic at concentrations consumed by millions of humans in contaminated drinking water.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 747-756 |
| Number of pages | 10 |
| Journal | Carcinogenesis |
| Volume | 24 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 1 2003 |
Fingerprint
ASJC Scopus subject areas
- Cancer Research
Cite this
Global alteration of gene expression in human keratinocytes by inorganic arsenic. / Rea, Miguel A.; Gregg, Jeffrey; Qin, Q.; Phillips, Marjorie A.; Rice, Robert H.
In: Carcinogenesis, Vol. 24, No. 4, 01.04.2003, p. 747-756.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Global alteration of gene expression in human keratinocytes by inorganic arsenic
AU - Rea, Miguel A.
AU - Gregg, Jeffrey
AU - Qin, Q.
AU - Phillips, Marjorie A.
AU - Rice, Robert H.
PY - 2003/4/1
Y1 - 2003/4/1
N2 - Alteration of gene expression by inorganic arsenic has been studied in cultured human keratinocytes derived from normal epidermis, a premalignant lesion and a malignant tumor. The purpose was to find whether these cells displayed common alterations in gene expression that might elucidate the mechanism of arsenic action. Global analysis of ∼12 000 genes by microarray showed that ∼30% were expressed. Of these, transcription of a substantial fraction (up to 12%) was altered, nearly twice as many being suppressed as stimulated by 2-fold or more at 2 μM sodium arsenite or 6 μM arsenate, which did not affect cell growth. At 0.67 μM arsenite (50 p.p.b.), effects on transcription were less pronounced but clearly evident. Genes whose transcription was altered in common among all the treated keratinocytes included those induced by reactive oxygen, of which heme oxygenase-1 displayed the highest fold induction. Genes indicative of reactive oxygen generation were detected at the earliest time examined, raising the possibility this feature drives subsequent cellular responses. Unlike some agents that produced transient induction of heme oxygenase-1, arsenicals produced sustained induction. Comparison with other agents producing reactive oxygen in the cells, as reflected in heme oxygenase-1 induction, suggested cellular differentiation was suppressed by sustained but not transient generation of reactive oxygen. Sustained global changes in gene expression were seen in target cells treated chronically with inorganic arsenic at concentrations consumed by millions of humans in contaminated drinking water.
AB - Alteration of gene expression by inorganic arsenic has been studied in cultured human keratinocytes derived from normal epidermis, a premalignant lesion and a malignant tumor. The purpose was to find whether these cells displayed common alterations in gene expression that might elucidate the mechanism of arsenic action. Global analysis of ∼12 000 genes by microarray showed that ∼30% were expressed. Of these, transcription of a substantial fraction (up to 12%) was altered, nearly twice as many being suppressed as stimulated by 2-fold or more at 2 μM sodium arsenite or 6 μM arsenate, which did not affect cell growth. At 0.67 μM arsenite (50 p.p.b.), effects on transcription were less pronounced but clearly evident. Genes whose transcription was altered in common among all the treated keratinocytes included those induced by reactive oxygen, of which heme oxygenase-1 displayed the highest fold induction. Genes indicative of reactive oxygen generation were detected at the earliest time examined, raising the possibility this feature drives subsequent cellular responses. Unlike some agents that produced transient induction of heme oxygenase-1, arsenicals produced sustained induction. Comparison with other agents producing reactive oxygen in the cells, as reflected in heme oxygenase-1 induction, suggested cellular differentiation was suppressed by sustained but not transient generation of reactive oxygen. Sustained global changes in gene expression were seen in target cells treated chronically with inorganic arsenic at concentrations consumed by millions of humans in contaminated drinking water.
UR - http://www.scopus.com/inward/record.url?scp=0037717085&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037717085&partnerID=8YFLogxK
U2 - 10.1093/carcin/bgg010
DO - 10.1093/carcin/bgg010
M3 - Article
C2 - 12727804
AN - SCOPUS:0037717085
VL - 24
SP - 747
EP - 756
JO - Carcinogenesis
JF - Carcinogenesis
SN - 0143-3334
IS - 4
ER -