Downregulation of ABCD1 in human renal cell carcinoma.
Renal cell carcinoma (RCC) is the most common malignant tumor of the kidney. Delayed diagnosis may result in progression and metastasis. Markers for early detection of RCC are lacking. The ATP-binding cassette transporter D1 (ABCD1) is located in the human peroxisome membrane. Its mutation causes X-linked adrenoleukodystrophy (X-ALD), a peroxisomal disorder affecting lipid storage. The role of ABCD1 in human renal tumorigenesis was unclear. In this study, three pairs of RCC tissues were examined by cDNA microarray and data suggested that ABCD1 mRNA is downregulated. Downregulation of ABCD1 expression was confirmed by real-time PCR. ABCD1 expression was also downregulated in four renal cancer cell lines compared to immortalized benign renal tubular cells. ABCD1 mRNA and protein expression levels assessed by immunohistochemistry in the RCC tissues were similar between genders, tumor grades, and tumor stages. Immunohistochemical assays also showed that ABCD1 expression was significantly higher in normal than in cancerous tissues (p<0.001). ABCD1 downregulation may be involved in human renal tumorigenesis.
Institute of Biochemistry, Kaohsiung Medical University, Kaohsiung, Taiwan.
Tzyh-Chyuan
TC
Hour
Yi-Zih
YZ
Kuo
Guang-Yan
GY
Liu
Wang-Yi
WY
Kang
Chao-Yuan
CY
Huang
Yu-Chieh
YC
Tsai
Wen-Jeng
WJ
Wu
Shu-Pin
SP
Huang
Yeong-Shiau
YS
Pu
D000074063:ATP Binding Cassette Transporter, Subfamily D, Member 1; D018528:ATP-Binding Cassette Transporters / Q000235:genetics* / Q000378:metabolism; D002292:Carcinoma, Renal Cell / Q000235:genetics* / Q000473:pathology; D045744:Cell Line, Tumor; D015536:Down-Regulation; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007680:Kidney Neoplasms / Q000235:genetics / Q000473:pathology; D007684:Kidney Tubules / Q000473:pathology; D008297:Male; D009367:Neoplasm Staging; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction
C115572:ABCD1 protein, human; D000074063:ATP Binding Cassette Transporter, Subfamily D, Member 1; D018528:ATP-Binding Cassette Transporters; D012333:RNA, Messenger