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Invasive migration of epidemic Kaposi's sarcoma cells in vitro
C G Schirren1, W K Roth, R Hein
1Dermatologische Klinik und Poliklinik, Ludwig-Maximilians-Universität München, F.R.G.
Abstract:
Kaposi's sarcoma (KS) is a low grade malignant neoplasm which shows invasive growth and often occurs in immunosuppressed patients with the Acquired Immune Deficiency Syndrome (AIDS; epidemic KS). It is also found in elderly men where it is usually limited to the skin (classic KS). The present study investigated the chemotaxis and invasive migration of epidemic KS cells in vitro and compared them to cells grown from classic KS lesions and to fibroblasts. Epidemic KS cells demonstrated invasive migration through reconstituted basement membrane (Matrigel) as well as through interstitial connective tissue (collagen I) in early passages, whereas fibroblasts did not invade either barrier. Epidemic KS cells in late passages did not show any invasive migration. Following pretreatment with tumour necrosis factor alpha (TNF-alpha) there was no enhanced migration through the Matrigel and collagen I for epidemic KS cells, whereas classic KS cells showed an increased migration through the type I collagen barrier.
Insights
Epidemic Kaposi's sarcoma (KS) cells show invasive migration early in culture, unlike classic KS cells. Tumor necrosis factor alpha (TNF-alpha) enhances classic KS cell invasion but not epidemic KS cell invasion.
Area of Science:
- Oncology
- Cell Biology
- Immunology
Background:
- Kaposi's sarcoma (KS) is a malignant neoplasm often associated with immunosuppression (epidemic KS) or elderly men (classic KS).
- Understanding the invasive properties of different KS subtypes is crucial for developing targeted therapies.
- Invasive migration is a key characteristic of malignant neoplasms.
Purpose of the Study:
- To investigate and compare the in vitro chemotaxis and invasive migration of epidemic KS cells versus classic KS cells.
- To assess the impact of tumor necrosis factor alpha (TNF-alpha) on the invasive capabilities of both KS subtypes.
- To compare KS cell invasiveness to that of normal fibroblasts.
Main Methods:
- In vitro invasion assays using reconstituted basement membrane (Matrigel) and type I collagen.
- Culturing and passaging of epidemic KS cells, classic KS cells, and fibroblasts.
- Pretreatment of cells with tumor necrosis factor alpha (TNF-alpha) before invasion assays.
Main Results:
- Early-passage epidemic KS cells exhibited invasive migration through Matrigel and collagen I, while fibroblasts did not.
- Late-passage epidemic KS cells lost their invasive potential.
- TNF-alpha pretreatment did not enhance Matrigel or collagen I invasion in epidemic KS cells.
- Classic KS cells showed increased migration through type I collagen after TNF-alpha treatment.
Conclusions:
- Epidemic KS cells possess inherent invasive properties in early culture stages, which diminish over time.
- Classic KS cells demonstrate a differential response to TNF-alpha, with enhanced collagen invasion.
- These findings highlight distinct migratory behaviors between epidemic and classic Kaposi's sarcoma subtypes.