Overexpression of PDZK1 within the 1q12-q22 amplicon is likely to be associated with drug-resistance phenotype in multiple myeloma

Jun Inoue, Takemi Otsuki, Akira Hirasawa, Issei Imoto, Yoshinobu Matsuo, Shiroh Shimizu, Masafumi Taniwaki, Johji Inazawa

Research output: Contribution to journalArticle

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Abstract

We investigated DNA copy number aberrations in 37 cell lines derived from multiple myelomas (MMs) using comparative genomic hybridization, and 11 (29.70%) showed high-level gain indicative of gene amplification at 1q12-q22. A corresponding transcriptional mapping using oligonucleotide arrays extracted three up-regulated genes (IRTA2, PDZK1, and S100A6) within the smallest region of overlapping in amplifications. Among them PDZK1 showed amplification and consequent overexpression in the MM cell lines. Amplification of PDZK1 was observed in primary cases of MM as well. MM cell lines with amplification of PDZK1 exhibited the resistance to melphalan-, cis-platin-, and vincristin-induced cell death compared with MM cell lines without its amplifications. Furthermore, down-regulation of PDZK1 with an anti-sense oligonucleotide sensitized a cell line KMS-11 to melphalan, cis-platin, and vincristin. Taken together, our results indicate that PDZK1 is likely to be one of targets for 1q12-q22 amplification in MM and may be associated with the malignant phenotype, including drug resistance, in this type of tumor.

Original languageEnglish
Pages (from-to)71-81
Number of pages11
JournalAmerican Journal of Pathology
Volume165
Issue number1
Publication statusPublished - 2004 Jul
Externally publishedYes

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Multiple Myeloma
Drug Resistance
Phenotype
Cell Line
Melphalan
Comparative Genomic Hybridization
Gene Amplification
Antisense Oligonucleotides
Oligonucleotide Array Sequence Analysis
Cell Death
Down-Regulation
DNA
Genes
Neoplasms

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

Inoue, J., Otsuki, T., Hirasawa, A., Imoto, I., Matsuo, Y., Shimizu, S., ... Inazawa, J. (2004). Overexpression of PDZK1 within the 1q12-q22 amplicon is likely to be associated with drug-resistance phenotype in multiple myeloma. American Journal of Pathology, 165(1), 71-81.

Overexpression of PDZK1 within the 1q12-q22 amplicon is likely to be associated with drug-resistance phenotype in multiple myeloma. / Inoue, Jun; Otsuki, Takemi; Hirasawa, Akira; Imoto, Issei; Matsuo, Yoshinobu; Shimizu, Shiroh; Taniwaki, Masafumi; Inazawa, Johji.

In: American Journal of Pathology, Vol. 165, No. 1, 07.2004, p. 71-81.

Research output: Contribution to journalArticle

Inoue, J, Otsuki, T, Hirasawa, A, Imoto, I, Matsuo, Y, Shimizu, S, Taniwaki, M & Inazawa, J 2004, 'Overexpression of PDZK1 within the 1q12-q22 amplicon is likely to be associated with drug-resistance phenotype in multiple myeloma', American Journal of Pathology, vol. 165, no. 1, pp. 71-81.
Inoue, Jun ; Otsuki, Takemi ; Hirasawa, Akira ; Imoto, Issei ; Matsuo, Yoshinobu ; Shimizu, Shiroh ; Taniwaki, Masafumi ; Inazawa, Johji. / Overexpression of PDZK1 within the 1q12-q22 amplicon is likely to be associated with drug-resistance phenotype in multiple myeloma. In: American Journal of Pathology. 2004 ; Vol. 165, No. 1. pp. 71-81.
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