Key result
Disruption of cell-cell interactions in NIH-3T3 fibroblasts triggered downregulation of the flotillin-1 gene, while establishment of new interactions increased its transcript and protein.
Flotillin-1 expression in NIH-3T3 fibroblasts is dynamically regulated by cell-cell interactions, increasing upon cell confluence.
Answers are grounded in this paper and cite their sources.
Dynamic flotillin-1 regulation by cell contacts is hypothesis-generating in fibroblasts; leaves open its role in cardiac tissue remodeling.
Flotillin-1 is a lipid raft-associated protein involved in neuronal regeneration, insulin signaling in adipocytes, and phagosome maturation in macrophages. We detected abundant flotillin-1 mRNA expression in confluent cultures of mouse NIH-3T3 fibroblasts. These cells were used as a model to assess the regulation of flotillin-1 mRNA and protein expression by cell-cell interactions. The disruption of cell-cell interactions triggered the downregulation of the flotillin-1 gene. However, the establishment of new cell interactions, and finally confluence, increased both the flotillin-1 transcript and its protein. Despite flotillin-1 having been described as an integral protein of the cell membrane, it is also very conspicuous in the hydrophilic fraction (the non-membrane fraction) of confluent cell extracts. The promoter region of the flotillin-1 gene was isolated and analyzed by transfection experiments, and the regulatory domains containing motifs for binding transcription factors involved in cell differentiation were identified.
No takes yet. Share an insight, caveat, or question.
López‐Casas et al. (2003) studied this question. Cell-cell interactions was evaluated on Flotillin-1 mRNA and protein expression. Disruption of cell-cell interactions in NIH-3T3 fibroblasts triggered downregulation of the flotillin-1 gene, while establishment of new interactions increased its transcript and protein.
Synapse has enriched 10 related papers. Consider them for comparative context: