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The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
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The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins”   is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This...
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E-cadherin Gene (CDH1) Expression in Low Grade Astrocytoma.

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Low-grade astrocytoma, a common brain tumor, shows decreased E-cadherin (CDH1) gene expression. This downregulation is significant, with higher grades exhibiting more pronounced changes, impacting tumor invasiveness.

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Area of Science:

  • Neuro-oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Astrocytomas are common primary brain tumors known for invasiveness and high mortality.
  • Downregulation of E-cadherin (CDH1), a cell adhesion molecule, is linked to tumor invasion and metastasis in various cancers.

Purpose of the Study:

  • To investigate the gene expression level of E-cadherin (CDH1) in low-grade astrocytoma.
  • To correlate E-cadherin expression with tumor grade in astrocytoma.

Main Methods:

  • Analysis of 22 low-grade astrocytoma tissues (WHO Grade I and II) and control brain tissues.
  • Histological examination using Hematoxylin and Eosin (H&E) staining.
  • Quantitative assessment of CDH1 gene expression via real-time polymerase chain reaction (RT-PCR) and comparative Ct method.

Main Results:

  • All astrocytoma cases exhibited downregulation of CDH1 gene expression compared to control tissues.
  • A statistically significant reduction (p=0.019) in E-cadherin expression was observed.
  • WHO Grade II astrocytomas showed greater CDH1 downregulation than WHO Grade I tumors.

Conclusions:

  • E-cadherin (CDH1) gene downregulation is a characteristic feature of low-grade astrocytoma.
  • The degree of E-cadherin downregulation correlates with astrocytoma tumor grade, suggesting its role in tumor progression.