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Transforming growth factor beta regulates differentiation and proliferation of human neuroblastoma
S Scarpa1, A Coppa, M Ragano-Caracciolo
1Experimental Medicine and Pathology Department, University La Sapienza, Rome, Italy.
Abstract:
The effects of transforming growth factor-beta1 (TGFbeta) on two human neuroblastoma cell lines, LAN-5 and SK-N-AS, and one human glioblastoma cell line, GL15, were evaluated. Of the three cultures, only two, SK-N-AS and GL15, had a complete response to TGFbeta, with induction of the following effects: (i) inhibition of cell proliferation; (ii) up-regulation of the extracellular matrix glycoprotein fibronectin, together with down-regulation of the VLA5 integrin receptor; (iii) up-regulation of histotype-specific cytoskeletal intermediate filaments (neurofilaments for neuroblastoma and GFAP for glioblastoma); and (iv) increase in the glycoprotein CD44, only in SK-N-AS. In the third cell line, neuroblastoma LAN-5, the effects exerted by TGFbeta consisted only of (i) neurofilament increase and (ii) morphological differentiation. The TGFbeta receptor pattern was different in each culture: SK-N-AS expressed low rates of type I and type II receptors and high rates of type III receptor; LAN-5 expressed high rates of type I, low rates of type II, and no type III; GL15 expressed high rates of all three receptors. These data suggest that TGFbeta can induce a histotype-specific cell maturation and that the neuroblastoma expressing low type II and at the same time lacking type III receptor responds only partially to TGFbeta, with induction of neural differentiation but without inhibition of cell growth.
Insights
Transforming growth factor-beta1 (TGFbeta) induces cell maturation in neuroblastoma and glioblastoma cells. Receptor expression levels dictate TGFbeta
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Transforming growth factor-beta1 (TGFbeta) is a key regulator of cell growth and differentiation.
- Neuroblastoma and glioblastoma are aggressive brain tumors with distinct cellular origins.
Purpose of the Study:
- To investigate the differential effects of TGFbeta on human neuroblastoma and glioblastoma cell lines.
- To correlate TGFbeta receptor expression patterns with cellular responses.
Main Methods:
- Treatment of LAN-5 (neuroblastoma), SK-N-AS (neuroblastoma), and GL15 (glioblastoma) cell lines with TGFbeta.
- Analysis of cell proliferation, fibronectin and CD44 expression, VLA5 integrin receptor levels, and cytoskeletal intermediate filaments (neurofilaments, GFAP).
- Assessment of TGFbeta receptor types I, II, and III expression patterns in each cell line.
Main Results:
- SK-N-AS and GL15 cells showed complete TGFbeta response, including inhibited proliferation, altered fibronectin/VLA5/CD44 expression, and upregulated intermediate filaments.
- LAN-5 cells exhibited partial response with increased neurofilaments and morphological differentiation only.
- Distinct TGFbeta receptor expression profiles were observed: SK-N-AS (low I/II, high III), LAN-5 (high I, low II, no III), GL15 (high I/II/III).
Conclusions:
- TGFbeta can induce histotype-specific cell maturation in neural tumors.
- Partial TGFbeta response in neuroblastoma LAN-5 is linked to low type II and absent type III receptor expression.
- Differential receptor expression dictates the extent of TGFbeta-mediated cellular changes, impacting proliferation and differentiation.