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A role for matrix metalloproteinases and tumor host interaction in hepatocellular carcinomas
Gregory J McKenna1, Yongliang Chen, R Matt Smith
1Department of Surgery, Vancouver Hospital and Health Sciences Centre, University of British Columbia, 910 West 10th Ave., Vancouver, British Columbia, Canada V5Z 4E3.
Background:
Hepatocellular carcinoma (HCC) occur in livers with injury-remodeling, accomplished by enzymes called matrix metalloproteinases (MMP). Metastasis involves basement membrane invasion also caused by MMP activity. Alterations in MMP expression and their endogenous inhibitor (TIMP) may factor in HCC metastasis.
Methods:
HCC specimens and lymph nodes (n = 7), and normal lymph tissue from organ donors (n = 8), were snap-frozen in liquid nitrogen and the mRNA precipitated. A series of reverse transcription-polymerase chain reactions (RT-PCR) were performed using MMP (MMP2, MMP7, MMP9) primers and TIMP (TIMP1, TIMP2) primers. These were semiquantitatively analyzed by comparing concentration with constitutive GADPH expression.
Results:
There is an increase in MMP2:TIMP2 mRNA expression ratio in the normal and tumor margin tissue compared to the tumor. There are increases in all MMP and TIMP mRNA expression (except TIMP1) and alterations in all of the MMP:TIMP expression ratios in the draining lymph node.
Conclusions:
Alterations exist in MMP2:TIMP2: expression at the margin, and all of the MMPs in the draining lymph nodes. This likely reflects a host-tumor interaction that regulates tumor metastasis.
Insights
Matrix metalloproteinases (MMP) and tissue inhibitors of metalloproteinases (TIMP) show altered expression in hepatocellular carcinoma (HCC) metastasis. These changes in MMP and TIMP mRNA expression in tumor margins and lymph nodes suggest a host-tumor interaction regulating metastasis.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Hepatocellular carcinoma (HCC) involves liver injury and remodeling, driven by matrix metalloproteinases (MMPs).
- MMP activity is crucial for basement membrane invasion during metastasis.
- Dysregulation of MMPs and their inhibitors (TIMPs) may influence HCC metastasis.
Purpose of the Study:
- To investigate the mRNA expression of MMPs and TIMPs in HCC.
- To analyze alterations in MMP and TIMP expression ratios in tumor tissues and lymph nodes.
- To explore the role of host-tumor interactions in HCC metastasis.
Main Methods:
- Analysis of HCC specimens and lymph nodes (n=7) alongside normal lymph tissue (n=8).
- Messenger RNA (mRNA) extraction and precipitation.
- Reverse transcription-polymerase chain reaction (RT-PCR) for MMP2, MMP7, MMP9, TIMP1, and TIMP2 mRNA.
- Semi-quantitative analysis of mRNA expression normalized to Glyceraldehyde 3-phosphate dehydrogenase (GADPH).
Main Results:
- An increased MMP2:TIMP2 mRNA expression ratio was observed in normal and tumor margin tissues compared to tumor tissue.
- Elevated expression of most MMPs and TIMPs (excluding TIMP1) was found in draining lymph nodes.
- Significant alterations in MMP:TIMP expression ratios were noted in the draining lymph nodes.
Conclusions:
- Expression of MMP2 and TIMP2 is altered at the tumor margin in HCC.
- All investigated MMPs exhibit altered expression in draining lymph nodes of HCC patients.
- These molecular changes suggest a host-tumor interaction that potentially regulates tumor metastasis.