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. 1995 Apr;15(2):221–237. doi: 10.1007/BF02073330

Expression of mRNAs of multiple growth factors and receptors by astrocytes and glioma cells: Detection with reverse transcription-polymerase chain reaction

Asgar Zaheer 1, Weixiong Zhong 1, Ergun Y Uc 1, David R Moser 2, Ramon Lim 1,✉
PMCID: PMC11563123  PMID: 8590453

Abstract

1. Although glial cells in culture are known to secrete growth factors and are also known to be responsive to some of them, detailed comparisons are difficult because the bulk of information was based on various animals of origin, developmental stages, growth properties, culture age, and culture conditions.

2. To present a unified picture of the growth factors and their receptors found in glial cells, we surveyed the expression of messenger RNAs of a panel of growth factors and receptors, using reverse transcription-polymerase chain reaction (RT-PCR), in three common glial cell types: rat astrocytes in primary culture, rat glioma line C6, and human glioma line A172.

3. We observed that normal and neoplastic glial cells in culture express multiple growth factors and also possess most of the receptors to these factors, suggesting multiple autocrine functions. In addition, glia produce growth factors known to be capable of acting on neurons, implicating paracrine function involving glia-neuron interaction. Glial cells also produce growth factors and receptors that are capable of communicating with hematopoietic cells, suggesting neuroimmunologic interaction. What is most interesting is that glial cells express receptors for growth factors previously thought to be acting on neurons only.

4. The current study demonstrates the feasibility of screening from a small sample a large number of growth factors and receptors. The method portends future clinical application to biopsy or necropsy samples from brain tumors or pathologic brains suffering from degenerative diseases such as Alzheimer's or Parkinson's disease.

Key words: astrocytes, glioma, gene expression, growth factors, reverse transcription, polymerase chain reaction

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