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1991 Fiscal Year Final Research Report Summary

Molecular cloning of cDNAs corresponding to mRNAs whchi increase in malignantly transformer FRTL cells.

Research Project

Project/Area Number 02807223
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 内分泌・代謝学
Research InstitutionYamanashi Medical College

Principal Investigator

ENDO Toyoshi  Yamanashi Medical College, Assistant Professor, 医学部, 講師 (00152017)

Project Period (FY) 1990 – 1991
Keywordsthyroid cancer / molecular biology / ribosome / heat shock protein / Po protein / GRP78 protein
Research Abstract

We previously developed malignantly transformed cells designated as FRTL-Tc with thyroid stimulating hormone (TSH) receptors which were derived from FRTL cells. To characterize these FRTL-Tc cells further, we cloned cDNAs corresponding to mRNA species showing increased expression in FRTL-Tc cells compared to FRTL cells. A lambda gt10 library was constructed using polyadenylated mRNA from FRTL-Tc cells. The library was then screened for the cDNAs by differential plaque filter hybridization using single stranded cDNA probes synthesized from mRNA prepared from FRTL and FRTL-Tc cells. Of 25, 000 clones screened, 3 clones (Cl3, C17 and C140) were found to represent mRNA species whose levels were higher in FRTL-TC cells.
Densitometric quantification of the mRNAs corresponding to C13, C17 and C140 in FRTL-TC cells gave values of 2.84, 1.33 and 5.86, respectively, when the levels in FRTL cells were taken as 1.0. The sizes of C13, C17 and C140 were 1.0, 0.8 kb, respectively. Northern blot analysis showed that the sizes of the corresponding mRNAs to these clones were 1.0, 2.0 and 0.8 kb, respectively. The mRNAs corresponding to C13 and C140 were found in all tissues investigated from Eisher rats, but the expression of C17 MRNA was extremely high in the thyroid only. Determination of the partial nucleotide sequences of these three clones showed they were neither genes for thyroglobulin nor thyroid peroxidase. C17 and C140 bore no homology to any known nucleotide sequences, but C13 was 90% homologous with the human ribosomal protein, Po. Electron microscopy showed that more free ribosomes existed in FRTL-Tc cells than in FRTL cells. Characterization of these genes might provide insights into the novel opportunity to study the nature of thyroid cancer as well as the function of normal thyroid epithelial cells.

  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] Ikeda,M.et al.: "Thyrotropin Stimulaytes the Expression of an Acidic Ribosomal Protein,P0,Messenger Ribonucleic Acidic Cultured Rat Thyroid (FRTL) Cells" Endocrinology. 128. 2540-2547 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Endo,T.et al.: "Thyrotropin Stimualtes Glucose Regulated Protein (GRP78) Gene Expression in Rat Functional Thyroid Epithelial Cells,FRTL" Molecular Endocrinology. 5. 905-910 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toyoshi Endo & Toshimasa Onaya: "Progress in Thyroid Research" Gordon,Gross & Henneman, 4 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ikeda, M. et al.: "Thyrotropin Stimulaytes the Expression of an Acidic Ribosomal Protein, P0, Messenger Ribonucleic Acidic Cultured Rat Thyroid (FRTL) Cells" Endocrinology. 128. 2540-2547 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Endo, T. et al.: "Thyrotropin Stimualtes Glucose Regulated Protein (GRP78) Gene Expression in Rat Functional Thyroid Epithelial Cells, FRTL" Molecular Endocrinology. 5. 905-910 (1991)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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