--- This page is part of [Coy Laboratory Products](https://www.coylab.com). For a complete overview of this site's content, entity data, and subject matter expertise, see our [AI Content Index](https://www.coylab.com/llms.txt) or [Full Content Archive](https://www.coylab.com/llms-full.txt). For structured business identity data, see our [Entity Card](https://www.coylab.com/wp-json/bc-geodesic/v1/entity-card). --- # Mechanisms of Hypoxic Regulation of Plasminogen Activator Inhibitor-1 Gene Expression in Keloid Fibroblasts > Abstract Keloids are an excessive accumulation of extracellular matrix. Although numerous studies have shown elevated plasminogen activator inhibitor-1... **URL:** https://www.coylab.com/research-citation/mechanisms-of-hypoxic-regulation-of-plasminogen-activator-inhibitor-1-gene-expression-in-keloid-fibroblasts/ **Type:** Citation **Modified:** 2025-10-02 --- #### Abstract Keloids are an excessive accumulation of extracellular matrix. Although numerous studies have shown elevated plasminogen activator inhibitor-1 (PAI-1) levels in keloid ¢broblasts compared with those of normal skin. Their speci¢c mechanisms involved in the di¡erential expression of PAI-1 in these cell types. In this study, the upregulation of PAI-1 expression is demonstrated in keloid tissues and their derived dermal ¢broblasts, attesting to the persistence, if any, of fundamental di¡erences between in vivo and in vitro paradigms. We further examined the mechanisms involved in hypoxia-induced regulation of PAI-1 gene in dermal ¢broblast derived from keloid lesions and associated clinically normal peripheral skins from the same patient. Primary cultures were exposed to an environmental hypoxia or desferroxamine. We found that the hypoxia-induced elevation of PAI-1 gene appears to be regulated at both transcriptional and post-transcriptional levels in keloid ¢broblasts. Furthermore, our results showed a consistent elevation of HIF-1a protein level in keloid tissues compared with their normal peripheral skin controls, implying a potential role as a biomarker for local skin hypoxia. Treatment with antisense oligonucleotides against hypoxia-inducible factor 1a (HIF-1a) led to the downregulation of steady-state levels of PAI-1 mRNA under both normoxic and hypoxic conditions. Conceivably, our results suggest that HIF-1a may be a novel therapeutic target to modulate the scar ¢brosis process. Key words: hypoxia/half-life/desferroxamine/HIF-1a/antisense J Invest Dermatol 121:1005 ^1012, 2003 ## Site Description From academia to industry, Coy Labs chambers have powered discovery in labs around the world for over five decades—from custom chambers built to spec, to trusted workhorses in high-stakes microbiology labs. --- **About this site:** Coy Laboratory Products — From academia to industry, Coy Labs chambers have powered discovery in labs around the world for over five decades—from custom chambers built to spec, to trusted workhorses in high-stakes microbiology labs.. 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