Related Experiment Video
Updated: Jun 3, 2026
Differentiation of a Human Neural Stem Cell Line on Three Dimensional Cultures, Analysis of MicroRNA and Putative Target Genes
Published on: April 12, 2015
Characterization of human platelet microRNA by quantitative PCR coupled with an annotation network for predicted
1Linköping University, Clinical and Experimental Medicine, Department of Clinical Chemistry, SE-581 85 Linköping, Sweden. Majid.Osman@lio.se
Abstract:
Platelets are anucleate blood cells that play a crucial role in thrombosis and hemostasis. Despite their lack of nuclear DNA, platelets contain significant amounts of microRNA (miRNA) that may have vital functions in post-transcriptional gene regulation. Here, we combined comprehensive miRNA expression profiling by quantitative PCR with target prediction analysis for the most abundant miRNAs in human platelets. A network composed of predicted platelet miRNA target genes was then constructed, using annotations available in Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) databases. In addition, we evaluated possible differences in miRNA levels between resting and thrombin-stimulated platelets. We identified 281 transcripts, including 228 mature miRNAs and 53 minor miRNAs (or miR*), of which six miRNAs (miR-15 a, miR-339-3 p, miR-365, miR-495, miR-98, and miR-361-3 p) were up- or down-regulated in activated human platelets (P ≤ 0.001). A redundancy-reduced network was established that encompassed 246 genes in five statistically significant functional clusters representing platelet miRNA regulating pathways. Comparison of the 246 network genes with the platelet mRNA expression data available at ArrayExpress database confirmed that most of these genes (89%) are expressed in human platelets. In conclusion, this work affirms a recent microarray study reporting a wide-spread existence of miRNAs in human platelets. Further, we observed that thrombin stimulation was associated with altered levels of some miRNAs in platelets. The proposed functional network, combining computational prediction analysis with annotations from experimental observations, may in addition provide some information about probable miRNA target pathways in human platelets.
Insights
Platelets contain microRNAs (miRNAs) that regulate gene expression. Thrombin stimulation alters miRNA levels, impacting platelet function and potentially related diseases.
Area of Science:
- Hematology
- Molecular Biology
- Bioinformatics
Background:
- Platelets are key in thrombosis and hemostasis.
- Despite lacking nuclei, platelets contain functional microRNAs (miRNAs).
- miRNAs regulate gene expression post-transcriptionally.
Purpose of the Study:
- To profile miRNA expression in human platelets.
- To predict and network miRNA targets.
- To investigate miRNA changes upon platelet activation.
Main Methods:
- Quantitative PCR for miRNA profiling.
- Bioinformatic target prediction analysis.
- Network construction using Gene Ontology and KEGG databases.
Main Results:
- Identified 281 transcripts, including 228 mature and 53 minor miRNAs.
- Six miRNAs showed altered levels in thrombin-stimulated platelets.
- A network of 246 genes in five functional clusters representing miRNA pathways was constructed.
Conclusions:
- Confirms widespread miRNA presence in human platelets.
- Thrombin stimulation alters specific platelet miRNA levels.
- The functional network provides insights into platelet miRNA regulatory pathways.
