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Actin, its associated proteins and metastasis
E Button1, C Shapland, D Lawson
1Department of Molecular Pathology, University College London (UCL) Medical School, United Kingdom.
Abstract:
In this short article we have overviewed the effect of transformation on AAPs. We have not dealt with molecules indirectly associated with actin which are modified by transformation, such as the catenins, cadherins, vinculin, and integrins [Tsukita et al., 1993], although their relationship with and importance to the transformed phenotype cannot be overemphasised. Similarly, alterations in polyphosphoinositide metabolism that occur in transformed cells may also promote or induce alterations in the microfilament cytoskeleton via interactions with proteins such as gelsolin, alpha-actinin, and MARCKS [Bretscher, 1993]. At present, there are no clear-cut rules regarding the effect that oncogenesis has on AAPs, since the expression level of one oncogenically modified AAP can vary from one tumour to another, even within the same type of tumour [Yamamoto et al., 1993]. This apparent inconsistency may well be because we are "playing with an incomplete pack of cards" [Pollard, 1993], or it may reflect this highly complex control mechanism in which any perturbation of the normal expression levels of actin/AAPs unbalances the delicate equilibrium which controls normal cell behaviour [Bray and Vasiliev, 1989]. For example, it is possible that oncogenically induced alterations to actin isoform expression [Lin et al., 1985] exert a downstream effect on actin-associated protein expression. Oncogenically induced actin based cell movements may be activated by alterations to either a single AAP or a synergistic functional unit of these molecules [Shapland et al., 1993; Vandekerckhove et al., 1990].(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
Transformation effects on actin-associated proteins (AAPs) remain unclear, with oncogenesis potentially altering AAP expression and actin-based cell movements. Further research is needed to understand these complex interactions.
Area of Science:
- Cell Biology
- Molecular Biology
- Oncology
Background:
- Actin-associated proteins (AAPs) play crucial roles in cellular structure and function.
- Cellular transformation, often driven by oncogenesis, can lead to significant alterations in the cytoskeleton.
- The precise impact of oncogenic transformation on AAPs is not fully elucidated.
Purpose of the Study:
- To review the current understanding of how cellular transformation affects actin-associated proteins (AAPs).
- To highlight the complexity and inconsistencies observed in AAP expression during oncogenesis.
- To discuss potential downstream effects of oncogenic alterations on AAP function and cell behavior.
Main Methods:
- Literature review and synthesis of existing research on AAPs and cellular transformation.
- Analysis of studies investigating changes in AAP expression and function in transformed cells.
- Discussion of indirect effects mediated by polyphosphoinositide metabolism and actin isoform alterations.
Main Results:
- The effect of transformation on AAPs is complex, with no clear-cut rules.
- AAP expression levels can vary significantly between tumors, even of the same type.
- Oncogenic alterations may affect actin isoform expression, leading to downstream changes in AAPs.
- Perturbations in actin/AAP equilibrium can disrupt normal cell behavior and induce actin-based cell movements.
Conclusions:
- The relationship between oncogenesis and AAPs is intricate and not fully understood.
- Further investigation is required to decipher the specific roles of individual AAPs and their synergistic interactions in transformed cells.
- Understanding these molecular mechanisms is crucial for comprehending the transformed phenotype and developing targeted therapies.