Methods: The activities of cathepsin L and its endogenous inhibitors were analyzed in rat embryo fibroblasts, immortalized and transformed by different genes.
Results: Regardless of the transfecting agent used (DNA of adenovirus SA7 or polyomavirus LT gene), the immortal cells showed an increase in the cathepsin L activity (in both lysates and conditioned media) compared to primary fibroblasts. Transformed cells exhibited either an increase (with c-Ha-ras gene) or decrease (with E7 HPV gene) in cathepsin L activity in lysates as opposed to immortal cells.
Conclusions: The data are suggestive of alterations in the trafficking of cathepsin L upon fibroblast transfection with polyomavirus LT gene and E7 HPV gene. An endogenous inhibitor(s) of cysteine proteinase was found in conditioned media, but not in lysates, of all cell cultures studied and its activity in normal fibroblasts was higher than in media of immortal and transformed cells.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/s0009-8981(01)00495-8 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
First generation vanadium-based PTEN inhibitors: Comparative study in vitro and in vivo and identification of a novel mechanism of action.
Biochem Pharmacol
January 2025
Department of Pharmacology, Faculty of Medicine, School of Health Sciences, University of Ioannina, 45110 Ioannina, Greece; Institute of Biosciences, University Research Center Ioannina, University of Ioannina, Ioannina, Greece. Electronic address:
PTEN, a tumor suppressor phosphatase, regulates cellular functions by antagonizing the growth promoting PI3K/Akt/mTOR pathway through the dephosphorylation of the second messenger PIP. Many preclinical cellular and animal studies have used PTEN inhibitors to highlight specific disease contexts where acute activation of PI3K/Akt/mTOR pathway might offer therapeutic advantages. In the present study we have re-evaluated first-generation PTEN inhibitors, including established bisperoxo-vanadium complexes (bpVs).
View Article and Find Full Text PDFSphingolipid long chain bases as mediators of cell death in olive fruit abscission.
Physiol Plant
January 2025
Laboratory of Plant Physiology, Universidad de Extremadura, Badajoz, Spain.
Plant sphingolipids are lipophilic membrane components essential for different cellular functions but they also act as signaling molecules in various aspects of plant development. However, the interaction between plant sphingolipids and abscission remains largely uncharacterized. Here, the possible role of sphingolipids in regulating fruit abscission was examined in the abscission zone (AZ) of olive fruit.
View Article and Find Full Text PDFDecreasing miR-433-3p activity in the osteoblast lineage blunts glucocorticoid-mediated bone loss.
Endocrinology
January 2025
Anne M. Delany, PhD, Center for Molecular Oncology, UConn Health, Farmington, CT.
Glucocorticoid excess causes bone loss due to decreased bone formation and increased bone resorption; miR-433-3p is a miRNA that negatively regulates bone formation in male mice by targeting Runx2 as well as RNAs involved in Wnt, protein kinase A and endogenous glucocorticoid signaling. To examine the impact of miR-433-3p on glucocorticoid-mediated bone loss, transgenic mice expressing a miR-433-3p tough decoy inhibitor in the osteoblast lineage were administered prednisolone via slow-release pellets. Bone loss was greater in control mice treated with prednisolone compared with miR-433-3p tough decoy mice due to higher osteoclast activity in the controls.
View Article and Find Full Text PDFSelf-Cascaded Pyroptosis-STING Initiators for Catalytic Metalloimmunotherapy.
J Am Chem Soc
January 2025
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China.
Gasdermin (GSDM)-mediated pyroptosis involves the induction of mitochondrial damage and the subsequent release of mitochondrial DNA (mtDNA), which is anticipated to activate the cGAS-STING pathway, thereby augmenting the antitumor immune response. However, challenges lie in effectively triggering pyroptosis in cancer cells and subsequently enhancing the cGAS-STING activation with specificity. Herein, we developed intelligent self-cascaded pyroptosis-STING initiators of cobalt fluoride (CoF) nanocatalysts for catalytic metalloimmunotherapy.
View Article and Find Full Text PDFA new twist on superantigen-activated autoimmune disease.
J Clin Invest
January 2025
Division of Rheumatology, Center of Excellence for Intestinal and Immunology Research, University of Alberta, Edmonton, Alberta, Canada.
Superantigen-induced (Sag-induced) autoimmunity has been proposed as a mechanism for many human disorders, without a clear understanding of the potential triggers. In this issue of the JCI, McCarthy and colleagues used the SKG mouse model of rheumatoid arthritis to characterize the role of Sag activity in inflammatory arthritis by profiling arthritogenic naive CD4+ T cells. Within the diseased joints, they found a marked enrichment of T cell receptor-variable β (TCR-Vβ) subsets that were reactive to the endogenously encoded mouse mammary tumor virus (MMTV) Sag.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!