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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a...
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Related Experiment Video

Updated: Aug 29, 2025

Isolation of Primary Mouse Hepatocytes for Nascent Protein Synthesis Analysis by Non-radioactive L-azidohomoalanine Labeling Method
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MiR-34a-5p promotes hepatic gluconeogenesis by suppressing SIRT1 expression.

Yiru Wang1, Feiye Zhou2, Mingzhu Li3

  • 1School of Medicine, Tongji University, Shanghai, China.

Experimental Cell Research
|September 4, 2022
PubMed
Summary

MicroRNAs (miRNAs), specifically miR-34a-5p, significantly impact hepatic gluconeogenesis and fasting hyperglycemia in diabetes. Inhibiting miR-34a-5p lowers glucose production, suggesting it as a therapeutic target for type 2 diabetes.

Keywords:
A485Hepatic gluconeogenesisPEPCKSIRT1miR-34a-5p

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Endocrinology

Background:

  • Elevated hepatic gluconeogenesis contributes to hyperglycemia in diabetes.
  • The role of microRNAs (miRNAs) in regulating hepatic gluconeogenesis is not well understood.

Purpose of the Study:

  • To investigate the role of miR-34a-5p in regulating hepatic gluconeogenesis.
  • To explore miR-34a-5p as a potential therapeutic target for type 2 diabetes.

Main Methods:

  • Assessed miR-34a-5p expression in db/db mice liver tissues.
  • Utilized mouse primary hepatocytes to study the effects of miR-34a-5p manipulation on glucose production and gene expression.
  • Investigated the interaction between miR-34a-5p, SIRT1, and gluconeogenic genes (e.g., PEPCK).
  • Employed pharmacological inhibitors (EX527, A485) to validate molecular mechanisms.

Main Results:

  • miR-34a-5p expression was elevated in db/db mice livers.
  • miR-34a-5p overexpression promoted hepatic glucose production and gluconeogenic gene expression, while inhibition had the opposite effect.
  • miR-34a-5p repressed SIRT1 expression, which influences PEPCK protein degradation and gluconeogenesis.
  • Inhibition of miR-34a-5p in db/db mice significantly reduced hepatic glucose production and gluconeogenic gene expression.

Conclusions:

  • miR-34a-5p plays a critical role in regulating hepatic gluconeogenesis.
  • miR-34a-5p represents a potential therapeutic target for managing hyperglycemia in type 2 diabetes.