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A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination
Published on: June 25, 2014
Pancreatic cancer-derived exosomal microRNA-19a induces β-cell dysfunction by targeting ADCY1 and EPAC2
Wenjing Pang1,2, Weiyan Yao3, Xin Dai3
1Department of Gastroenterology, Shanghai Jiaotong University School of Medicine affiliating Shanghai 9th People's Hospital, Shanghai, China.
Abstract:
New-onset diabetes mellitus has a rough correlation with pancreatic cancer (PaC), but the underlying mechanism remains unclear. This study aimed to explore the exosomal microRNAs and their potential role in PaC-induced β-cell dysfunction. The pancreatic β cells were treated with isolated exosomes from PaC cell lines, SW1990 and BxPC-3, before measuring the glucose-stimulated insulin secretion (GSIS), validating that SW1990 and BxPC-3 might disrupt GSIS of both β cell line MIN6 and primary mouse pancreatic islets. The difference in expression profiles between exosomes and exosome-free medium of PaC cell lines was further defined, revealing that miR-19a secreted by PaC cells might be an important signaling molecule in this process. Furthermore, adenylyl cyclase 1 (Adcy1) and exchange protein directly activated by cAMP 2 (Epac2) were verified as the direct targets of exogenous miR-19a, which was involved in insulin secretion. These results indicated that exosomes might be an important mediator in the pathogenesis of PaC-DM, and miR-19a might be the effector molecule. The findings shed light on the pathogenesis of PaC-DM.
Insights
Pancreatic cancer (PaC) may induce new-onset diabetes mellitus by releasing exosomes containing microRNA-19a (miR-19a). This miR-19a disrupts pancreatic beta-cell function, potentially explaining the link between PaC and diabetes.
Area of Science:
- Endocrinology
- Oncology
- Molecular Biology
Background:
- New-onset diabetes mellitus is associated with pancreatic cancer (PaC), but the underlying mechanisms are not fully understood.
- Exosomes are implicated in intercellular communication and disease pathogenesis.
Purpose of the Study:
- To investigate the role of exosomal microRNAs in pancreatic cancer-induced beta-cell dysfunction.
- To identify specific microRNAs involved in the link between PaC and diabetes mellitus (DM).
Main Methods:
- Pancreatic beta cells (MIN6 and primary mouse islets) were treated with exosomes isolated from PaC cell lines (SW1990, BxPC-3).
- Glucose-stimulated insulin secretion (GSIS) was measured to assess beta-cell function.
- Exosomal microRNA expression profiles were analyzed, and target genes of identified microRNAs were validated.
Main Results:
- Exosomes from PaC cell lines disrupted GSIS in beta cells.
- MicroRNA-19a (miR-19a) was identified as a key exosomal microRNA secreted by PaC cells.
- Adenylyl cyclase 1 (Adcy1) and exchange protein directly activated by cAMP 2 (Epac2) were confirmed as direct targets of miR-19a, influencing insulin secretion.
Conclusions:
- Exosomes act as mediators in the pathogenesis of pancreatic cancer-associated diabetes mellitus (PaC-DM).
- Exosomal miR-19a is a potential effector molecule contributing to beta-cell dysfunction in PaC-DM.
- These findings provide insights into the molecular mechanisms linking PaC and diabetes.
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