Loss of MAL expression in precancerous lesions of the esophagus

Koshi Mimori, Kohjiro Nishida, Yoshito Nakamura, Keisuke Ieta, Yasuji Yoshikawa, Atsushi Sasaki, Hideshi Ishii, Miguel A. Alonso, Masaki Mori

Research output: Contribution to journalArticle

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Abstract

Background: We have identified a novel function of MAL (T-cell differentiation-related gene) as a candidate suppressor gene in esophageal cancer. As the role of MAL expression in esophageal carcinogenesis is as yet undetermined, MAL expression in a rat multi-step carcinogenic model and in precancerous lesions of the human esophagus was investigated. Microarray analysis between MAL-transfectant and control cells was also carried out to clarify how MAL confers its anti-tumor effects. Materials and Methods: (1) In the rat model, MAL expression levels in laser microdissected normal esophageal epithelium, dysplastic tissues and carcinoma tissues were examined by reverse transcription (RT)-PCR. (2) Immunostaining with MAL antibody was performed in 10 dysplastic lesions adjacent to cancer in six cases of esophageal cancer. (3) We established a MAL transfectant using a Tet-off vector in esophageal cancer cells and performed microarray analysis under MAL-positive and MAL-negative conditions. Results: (1) In the rat model, MAL mRNA expression was observed only in the normal samples. (2) MAL expression was observed distinctively in differentiated or keratinized normal tissues and was not observed in either dysplastic lesions or carcinoma tissue. (3) Up-regulated genes in MAL-positive cells included keratin 18 (transfectant/control = 2.94) and keratin 10 (t/c = 2.82). Conclusion: MAL expression was lost in dysplastic lesions of the rat carcinoma model as well as the human esophagus. The up-regulated keratins revealed by microarray analysis and the strong staining of the differentiated normal tissues in immunohistochemical study support the role of MAL as a regulator of differentiation in esophageal epithelium.

Original languageEnglish
Pages (from-to)1670-1677
Number of pages8
JournalAnnals of Surgical Oncology
Volume14
Issue number5
DOIs
Publication statusPublished - May 1 2007

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Esophagus
Esophageal Neoplasms
Microarray Analysis
Carcinoma
Keratin-10
Epithelium
Tissue Array Analysis
Suppressor Genes
Keratin-18
Keratins
Genes
Reverse Transcription
Cell Differentiation
Neoplasms
Carcinogenesis
Lasers
Staining and Labeling
T-Lymphocytes
Polymerase Chain Reaction
Messenger RNA

All Science Journal Classification (ASJC) codes

  • Surgery
  • Oncology

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Loss of MAL expression in precancerous lesions of the esophagus. / Mimori, Koshi; Nishida, Kohjiro; Nakamura, Yoshito; Ieta, Keisuke; Yoshikawa, Yasuji; Sasaki, Atsushi; Ishii, Hideshi; Alonso, Miguel A.; Mori, Masaki.

In: Annals of Surgical Oncology, Vol. 14, No. 5, 01.05.2007, p. 1670-1677.

Research output: Contribution to journalArticle

Mimori, K, Nishida, K, Nakamura, Y, Ieta, K, Yoshikawa, Y, Sasaki, A, Ishii, H, Alonso, MA & Mori, M 2007, 'Loss of MAL expression in precancerous lesions of the esophagus', Annals of Surgical Oncology, vol. 14, no. 5, pp. 1670-1677. https://doi.org/10.1245/s10434-006-9064-2
Mimori K, Nishida K, Nakamura Y, Ieta K, Yoshikawa Y, Sasaki A et al. Loss of MAL expression in precancerous lesions of the esophagus. Annals of Surgical Oncology. 2007 May 1;14(5):1670-1677. https://doi.org/10.1245/s10434-006-9064-2
Mimori, Koshi ; Nishida, Kohjiro ; Nakamura, Yoshito ; Ieta, Keisuke ; Yoshikawa, Yasuji ; Sasaki, Atsushi ; Ishii, Hideshi ; Alonso, Miguel A. ; Mori, Masaki. / Loss of MAL expression in precancerous lesions of the esophagus. In: Annals of Surgical Oncology. 2007 ; Vol. 14, No. 5. pp. 1670-1677.
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abstract = "Background: We have identified a novel function of MAL (T-cell differentiation-related gene) as a candidate suppressor gene in esophageal cancer. As the role of MAL expression in esophageal carcinogenesis is as yet undetermined, MAL expression in a rat multi-step carcinogenic model and in precancerous lesions of the human esophagus was investigated. Microarray analysis between MAL-transfectant and control cells was also carried out to clarify how MAL confers its anti-tumor effects. Materials and Methods: (1) In the rat model, MAL expression levels in laser microdissected normal esophageal epithelium, dysplastic tissues and carcinoma tissues were examined by reverse transcription (RT)-PCR. (2) Immunostaining with MAL antibody was performed in 10 dysplastic lesions adjacent to cancer in six cases of esophageal cancer. (3) We established a MAL transfectant using a Tet-off vector in esophageal cancer cells and performed microarray analysis under MAL-positive and MAL-negative conditions. Results: (1) In the rat model, MAL mRNA expression was observed only in the normal samples. (2) MAL expression was observed distinctively in differentiated or keratinized normal tissues and was not observed in either dysplastic lesions or carcinoma tissue. (3) Up-regulated genes in MAL-positive cells included keratin 18 (transfectant/control = 2.94) and keratin 10 (t/c = 2.82). Conclusion: MAL expression was lost in dysplastic lesions of the rat carcinoma model as well as the human esophagus. The up-regulated keratins revealed by microarray analysis and the strong staining of the differentiated normal tissues in immunohistochemical study support the role of MAL as a regulator of differentiation in esophageal epithelium.",
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AU - Nishida, Kohjiro

AU - Nakamura, Yoshito

AU - Ieta, Keisuke

AU - Yoshikawa, Yasuji

AU - Sasaki, Atsushi

AU - Ishii, Hideshi

AU - Alonso, Miguel A.

AU - Mori, Masaki

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N2 - Background: We have identified a novel function of MAL (T-cell differentiation-related gene) as a candidate suppressor gene in esophageal cancer. As the role of MAL expression in esophageal carcinogenesis is as yet undetermined, MAL expression in a rat multi-step carcinogenic model and in precancerous lesions of the human esophagus was investigated. Microarray analysis between MAL-transfectant and control cells was also carried out to clarify how MAL confers its anti-tumor effects. Materials and Methods: (1) In the rat model, MAL expression levels in laser microdissected normal esophageal epithelium, dysplastic tissues and carcinoma tissues were examined by reverse transcription (RT)-PCR. (2) Immunostaining with MAL antibody was performed in 10 dysplastic lesions adjacent to cancer in six cases of esophageal cancer. (3) We established a MAL transfectant using a Tet-off vector in esophageal cancer cells and performed microarray analysis under MAL-positive and MAL-negative conditions. Results: (1) In the rat model, MAL mRNA expression was observed only in the normal samples. (2) MAL expression was observed distinctively in differentiated or keratinized normal tissues and was not observed in either dysplastic lesions or carcinoma tissue. (3) Up-regulated genes in MAL-positive cells included keratin 18 (transfectant/control = 2.94) and keratin 10 (t/c = 2.82). Conclusion: MAL expression was lost in dysplastic lesions of the rat carcinoma model as well as the human esophagus. The up-regulated keratins revealed by microarray analysis and the strong staining of the differentiated normal tissues in immunohistochemical study support the role of MAL as a regulator of differentiation in esophageal epithelium.

AB - Background: We have identified a novel function of MAL (T-cell differentiation-related gene) as a candidate suppressor gene in esophageal cancer. As the role of MAL expression in esophageal carcinogenesis is as yet undetermined, MAL expression in a rat multi-step carcinogenic model and in precancerous lesions of the human esophagus was investigated. Microarray analysis between MAL-transfectant and control cells was also carried out to clarify how MAL confers its anti-tumor effects. Materials and Methods: (1) In the rat model, MAL expression levels in laser microdissected normal esophageal epithelium, dysplastic tissues and carcinoma tissues were examined by reverse transcription (RT)-PCR. (2) Immunostaining with MAL antibody was performed in 10 dysplastic lesions adjacent to cancer in six cases of esophageal cancer. (3) We established a MAL transfectant using a Tet-off vector in esophageal cancer cells and performed microarray analysis under MAL-positive and MAL-negative conditions. Results: (1) In the rat model, MAL mRNA expression was observed only in the normal samples. (2) MAL expression was observed distinctively in differentiated or keratinized normal tissues and was not observed in either dysplastic lesions or carcinoma tissue. (3) Up-regulated genes in MAL-positive cells included keratin 18 (transfectant/control = 2.94) and keratin 10 (t/c = 2.82). Conclusion: MAL expression was lost in dysplastic lesions of the rat carcinoma model as well as the human esophagus. The up-regulated keratins revealed by microarray analysis and the strong staining of the differentiated normal tissues in immunohistochemical study support the role of MAL as a regulator of differentiation in esophageal epithelium.

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