Journal of Pathology and Translational Medicine

Original Articles

Lethal Giant Larvae2 Expression Is Reduced or Localized at Cytoplasm in Colon Adenomas and Adenocarcinomas.: Tae Jung Jang; Korean J Pathol. 2010;44(5):488-492.; DOI: https://doi.org/10.4132/KoreanJPathol.2010.44.5.488

2,750 View
14 Download

Abstract PDF: BACKGROUND
The Scribble, Par and Crumbs polarity modules are essential for establishing and maintaining apicobasal cell polarity in epithelial cells. The aim of the present study was to investigate the expression pattern of Lethal giant larvae2 (Lgl2) in normal colonic epithelium and epithelial tumors and to examine the relationship between Lgl2 expression and clinicopathological parameters.
METHODS
We examined Lgl2 expression in 66 primary colon cancers and 20 adenomas by immunohistochemistry.
RESULTS
In normal colonic epithelium, Lgl2 was strongly expressed at the basolateral membrane of cells in the luminal surface but was not expressed at the base of crypts. The expression pattern of E-cadherin in normal epithelium was similar to that of Lgl2. In contrast, tumors did not express Lgl2 or showed diffuse cytoplasmic staining. The Lgl2 positive rate in tumors was significantly lower than in normal epithelium, and its negative rate in tumors was higher in tumors with abnormal E-cadherin expression than in tumors with positive membranous staining. Lgl2 staining intensity was significantly lower in tumor budding sites than in tumor centers. No significant differences were observed between Lgl2 and clinicopathological parameters.
CONCLUSIONS
Lgl2 expression was reduced or localized at the cytoplasm in colon epithelial tumors, suggesting that a perturbation of Lgl2 expression frequently occurs in colon epithelial tumors.

Mutation and Expression of DNA2 Gene in Gastric and Colorectal Carcinomas.: Sung Hak Lee, Yoo Ri Kim, Nam Jin Yoo, Sug Hyung Lee; Korean J Pathol. 2010;44(4):354-359.; DOI: https://doi.org/10.4132/KoreanJPathol.2010.44.4.354

3,477 View
26 Download
3 Crossref

BACKGROUND
Deregulation of DNA repair and replication are involved in cancer development. DNA2 is a nuclease/helicase that plays roles in DNA repair and replication. The aim of this study was to explore DNA2 mutation and DNA2 protein expression in gastric cancers (GCs) and colorectal cancers (CRCs).
METHODS
We analyzed two mononucleotide repeats in DNA2 in 27 GCs with high microsatellite instability (MSI-H), 34 GCs with stable MSI (MSS), 29 CRCs with MSI-H and 35 CRCs with MSS by single-strand conformation polymorphism. We also analyzed DNA2 expression in GCs and CRCs either with MSI-H or MSS.
RESULTS
We found DNA2 mutations in two GCs (7.1%) and two CRCs with MSI-H (6.9%), but not in cancers with MSS. The mutations consisted of three cases of a c.2593delT and one of a c.2592_2593delTT, which would result in premature stopping of amino acid synthesis (p.Ser865Hisfsx6 and p.Ser865Thrfsx20, respectively). DNA2 expression was observed in 16 (80%) of the GCs and 15 (75%) of the CRCs with MSI-H, but all of the cancers with DNA2 frameshift mutations were weak or negative for DNA2.
CONCLUSIONS
Our data indicate that DNA2 mutation and loss of DNA2 expression occur in GCs and CRCs, and suggest that these alterations may contribute to cancer pathogenesis by deregulating DNA repair and replication.

Citations

Citations to this article as recorded by

Multiple roles of DNA2 nuclease/helicase in DNA metabolism, genome stability and human diseases
Li Zheng, Yuan Meng, Judith L Campbell, Binghui Shen
Nucleic Acids Research.2020; 48(1): 16. CrossRef
Integration of multiple networks and pathways identifies cancer driver genes in pan-cancer analysis
Claudia Cava, Gloria Bertoli, Antonio Colaprico, Catharina Olsen, Gianluca Bontempi, Isabella Castiglioni
BMC Genomics.2018;[Epub] CrossRef
Replication intermediates that escape Dna2 activity are processed by Holliday junction resolvase Yen1
Gizem Ölmezer, Maryna Levikova, Dominique Klein, Benoît Falquet, Gabriele Alessandro Fontana, Petr Cejka, Ulrich Rass
Nature Communications.2016;[Epub] CrossRef

Case Report

Malignant Peripheral Nerve Sheath Tumor in Descending Colon: A Case Report.: Young S Park, Sung Jing Lim, Woo Ho Kim, Eui Keun Ham; Korean J Pathol. 2002;36(3):179-183.

1,608 View
16 Download

Abstract PDF: We report a unique case of malignant peripheral nerve sheath tumor (MPNST) of colon, not associated with neurofibromatosis or parasite infection. The tumor presented as an encircling mass in descending colon causing obstruction with nuberous metastatic lesions in a 43-year-old man. The tumor was largely composed of spindle cells which showed strong positivity for vimemtin, S-100 protein and Leu-7. The tumor often exhibited epithelioid feature where tumor cells were weakly positive for cytokeratin.

Original Article

Mutational Analysis of Proapoptotic bcl-2 Family genes in Colon Carcinomas.: Young Hwa Soung, Jong Woo Lee, Su Young Kim, Suk Woo Nam, Won Sang Park, Jung Young Lee, Nam Jin Yoo, Sug Hyung Lee; Korean J Pathol. 2005;39(3):168-171.

1,552 View
22 Download

Abstract PDF: BACKGROUND
Several lines of evidence have indicated that the deregulation of apoptosis is involved in the mechanisms of cancer development, and somatic mutations of the apoptosisrelated genes have been reported in human cancers. Members of the bcl-2 family proteins regulate the intrinsic apoptosis pathway mainly in the mitochondria. The aim of this study was to explore whether the somatic mutation of the proapoptotic bcl-2 family genes, one of the mechanisms that prolong the survival of cancer cells, occurred in colorectal carcinomas.
METHODS
In the current study, to detect the somatic mutations in the DNA sequences encoding the bcl-2 homology 3 (BH3) domain of the human bak, bid, bik, bim, PUMA, bcl-rambo, bcl-G, and bmf genes in 98 colon adenocarcinomas, we used polymerase chain reaction (PCR), single strand conformation polymorphism (SSCP), and DNA sequencing.
RESULTS
The SSCP analysis detected no evidence of somatic mutations of the genes in the coding regions of the BH3 domain in the cancers.
CONCLUSIONS
The data presented here indicate that the proapoptotic bcl-2 family genes, bak, bid, bik, bim, PUMA, bcl-rambo, bcl-G and bmf may not be somatically mutated in human colorectal carcinomas, and suggest that the colorectal cancers may not utilize mutational events of these proapoptotic bcl-2 family genes in the mechanisms for evading apoptosis.

First
Prev
Page of 1
Next
Last

Search