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AP-1 transcription factor complexes in CNS disorders and development
1Department of Pharmacology and Therapeutics, University of South Florida College of Medicine, Tampa, USA.
Abstract:
Transcription factors are regulatory proteins that modify gene expression. Any cellular function requiring alterations in mRNA levels depends upon these factors. The CNS, AP-1 (activator protein-1; c-fos and fos-related antigens plus jun-related factors) and CREB (cAMP responsive element binding protein) families of transcription factors have been extensively studied. The DNA binding complex is composed of dimers formed between the AP-1 and CREB factors and binding specificity is dictated by which proteins comprise the complex. Whereas the AP-1 factors are inducible, CREB and related proteins are constitutive and regulate gene transcription through phosphorylation. Due to seizure activity, many AP-1 factors are induced, but rapidly return to basal levels. However, if neuronal death occurs, fos-related antigens of 35 kDa persist for an extended period and may be involved in regulating genes related to neuronal plasticity. Similar factors are expressed after chronic drug treatment indicating a role in drug tolerance. However, during early CNS development, elevated AP-1 DNA binding consisting of c-jun and CREB occurs in every brain region and is inversely related to the degree of maturation of a particular brain area. These transcription factors are important for gene regulation during CNS dysfunction and development and those present specify which genes are activated.
Insights
Transcription factors like activator protein-1 (AP-1) and cAMP responsive element binding protein (CREB) regulate gene expression in the CNS. Their roles in neuronal plasticity, drug tolerance, and brain development are crucial for understanding CNS dysfunction.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Transcription factors regulate gene expression by altering mRNA levels, essential for cellular functions.
- The activator protein-1 (AP-1) and cAMP responsive element binding protein (CREB) families are key transcription factors in the central nervous system (CNS).
- AP-1 factors are inducible, while CREB proteins are constitutive, with their dimeric complexes dictating DNA binding specificity.
Purpose of the Study:
- To investigate the roles of AP-1 and CREB transcription factors in CNS development and dysfunction.
- To understand how these factors regulate gene expression in response to neuronal activity and injury.
- To explore their involvement in neuronal plasticity, drug tolerance, and early brain development.
Main Methods:
- Analysis of AP-1 and CREB DNA binding activity in various CNS conditions.
- Investigating the expression patterns of AP-1 and CREB during CNS development and after seizure activity.
- Examining the persistence of fos-related antigens following neuronal death.
Main Results:
- Elevated AP-1 DNA binding, including c-jun and CREB, is observed in all brain regions during early CNS development, inversely correlating with maturation.
- While AP-1 factors are rapidly induced by seizures and return to basal levels, persistent 35 kDa fos-related antigens are linked to neuronal death and plasticity.
- Similar transcription factor patterns are seen after chronic drug treatment, suggesting a role in drug tolerance.
Conclusions:
- Transcription factors AP-1 and CREB are critical for gene regulation in the CNS during both development and dysfunction.
- The specific composition of AP-1/CREB complexes determines which genes are activated, influencing neuronal plasticity and responses to stimuli.
- Understanding these factors is vital for comprehending CNS processes and developing targeted therapies.