By immunofluorescent staining to visualize the cytoplasmic microtubular cytoskeleton in mouse fibroblasts we have ascertained that after a relatively short exposure of cells to colchicine, microtubules remain disassembled for a prolonged period of time after cells are transferred to a colchicine-free medium. In contrast to the persisting effects of colchicine, a brief exposure of cells to nocodazole first induces the expected disruption of microtubules followed by regeneration of the cytoskeleton within a few hours after removal of extracellular drug. These results shed light on our previous finding that quiescent mouse fibroblasts first treated with colchicine and then transferred to colchicine-free medium exhibit an enhanced proliferative response to EGF and insulin, whereas cells treated in a similar manner with nocodazole show no enhancement of DNA synthesis stimulated by peptide growth hormones. We conclude that cytoplasmic microtubules must remain disaggregated during the prereplicative G1 period in order for cells to exhibit the enhancing effects of the microtubule-disrupting drugs on DNA synthesis.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0014-4827(83)90174-x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Biofunctionalized patterned platform as microarray biochip to supervise delivery and expression of pDNA nanolipoplexes in stem cells via mechanotransduction.
J Nanobiotechnology
January 2025
School of Medicine, Shanghai University, Shanghai, 200444, China.
Biochips are widely applied to manipulate the geometrical morphology of stem cells in recent years. Patterned antenna-like pseudopodia are also probed to explore the influence of pseudopodia formation on gene delivery and expression on biochips. However, how the antenna-like pseudopodia affect gene transfection is unsettled and the underlying trafficking mechanism of exogenous genes in engineered single cells is not announced.
View Article and Find Full Text PDFTumour DNA methylation markers associated with breast cancer survival: a replication study.
Breast Cancer Res
January 2025
Precision Medicine, School of Clinical Sciences at Monash Health, Monash University, 246 Clayton Road, Clayton, VIC, 3168, Australia.
Background: Tumour DNA methylation has been investigated as a potential marker for breast cancer survival, but findings often lack replication across studies.
Methods: This study sought to replicate previously reported associations for individual CpG sites and multi-CpG signatures using an Australian sample of 425 women with breast cancer from the Melbourne Collaborative Cohort Study (MCCS). Candidate methylation sites (N = 22) and signatures (N = 3) potentially associated with breast cancer survival were identified from five prior studies that used The Cancer Genome Atlas (TCGA) methylation dataset, which shares key characteristics with the MCCS: comparable sample size, tissue type (formalin-fixed paraffin-embedded; FFPE), technology (Illumina HumanMethylation450 array), and participant characteristics (age, ancestry, and disease subtype and severity).
Hypoxia impairs decitabine-induced expression of HLA-DR in acute myeloid leukaemia cell lines.
Clin Epigenetics
January 2025
School of Biomedical Sciences and Pharmacy, The University of Newcastle, Callaghan, NSW, 2308, Australia.
Background: Hypomethylating agents (HMA), such as azacytidine (AZA) and decitabine (DAC), are epigenetic therapies used to treat some patients with acute myeloid leukaemia (AML) and myelodysplastic syndrome. HMAs act in a replication-dependent manner to remove DNA methylation from the genome. However, AML cells targeted by HMA therapy are often quiescent within the bone marrow, where oxygen levels are low.
View Article and Find Full Text PDFBacterial indole-3-propionic acid inhibits macrophage IL-1β production through targeting methionine metabolism.
Sci China Life Sci
January 2025
State Key Laboratory of Livestock and Poultry Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, China.
The gut microbiota plays key roles in host health by shaping the host immune responses through their metabolites, like indole derivatives from tryptophan. However, the direct role of these indole derivatives in macrophage fate decision and the underlying mechanism remains unknown. Here, we found that bacterial indole-3-propionic acid (IPA) downregulates interleukin-1beta (IL-1β) production in M1 macrophages through inhibition of nuclear factor-kappa B (NF-κB) signaling.
View Article and Find Full Text PDFFunctionally-informed fine-mapping identifies genetic variants linking increased CHD1L expression and HIV restriction in monocytes.
Sci Rep
January 2025
Sexually Transmitted and Bloodborne Infections Surveillance and Molecular Epidemiology, Sexually Transmitted and Bloodborne Infections Division at the JC Wilt Infectious Diseases Research Centre, National Microbiology Laboratories, Public Health Agency of Canada, Winnipeg, MB, R3E 3L5, Canada.
Human Immunodeficiency Virus Type 1 (HIV) set-point viral load is a strong predictor of disease progression and transmission risk. A recent genome-wide association study in individuals of African ancestries identified a region on chromosome 1 significantly associated with decreased HIV set-point viral load. Knockout of the closest gene, CHD1L, enhanced HIV replication in vitro in myeloid cells.
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!