Transfection of an activated rat oncogene into NIH3T3 fibroblasts leads to transformation and induction of a metastatic phenotype. To identify genes whose activation might mediate these processes, we used a differential screening strategy. A 1.5-kb transcript is induced fiftyfold, constitutes 1% of ras transformed cell messenger RNA (mRNA) and is the most abundantly induced message in these cells. Our sequence data shows that it encodes murine cathepsin L, a potent collagenolytic and elastinolytic lysosomal enzyme. The murine clone was used to isolate human cathepsin L complementary DNA (cDNA) clones. The complete nucleotide and deduced amino acid sequences of human and murine preprocathepsin L are presented and compared to other papain family cysteine proteinases. Northern analysis shows that both human and murine cathepsin L probes hybridize to a 1.5-kb transcript in several tissues, but also to a 4-kb transcript in human kidney. These clones will facilitate studies of the structure, expression, and function of cathepsin L, including its unexpected upregulation in transformation.
L J Joseph, L C Chang, D Stamenkovich, V P Sukhatme
Usage data is cumulative from April 2023 through April 2024.
Usage | JCI | PMC |
---|---|---|
Text version | 128 | 0 |
68 | 27 | |
Figure | 0 | 1 |
Scanned page | 155 | 13 |
Citation downloads | 11 | 0 |
Totals | 362 | 41 |
Total Views | 403 |
Usage information is collected from two different sources: this site (JCI) and Pubmed Central (PMC). JCI information (compiled daily) shows human readership based on methods we employ to screen out robotic usage. PMC information (aggregated monthly) is also similarly screened of robotic usage.
Various methods are used to distinguish robotic usage. For example, Google automatically scans articles to add to its search index and identifies itself as robotic; other services might not clearly identify themselves as robotic, or they are new or unknown as robotic. Because this activity can be misinterpreted as human readership, data may be re-processed periodically to reflect an improved understanding of robotic activity. Because of these factors, readers should consider usage information illustrative but subject to change.