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Related Concept Videos

Integrins01:10

Integrins

Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Insulin: The Receptor and Signaling Pathways01:28

Insulin: The Receptor and Signaling Pathways

Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but this inhibition is released...
Activation of Integrins01:15

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Integrator and Differentiator01:13

Integrator and Differentiator

Op-amp circuits have significant applications in various fields, including automotive engineering. One such application is cruise control systems in cars, where op-amp circuits are integral for maintaining a constant speed. In these systems, op-amps function as both integrators and differentiators.
An integrator within an op-amp circuit produces an output directly proportional to the integral of the input signal. This is achieved by replacing the feedback resistor in a typical inverting...

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Related Experiment Video

Updated: May 13, 2026

Differentiation and Imaging of Brown Adipocytes from the Stromal Vascular Fraction of Interscapular Adipose Tissue from Newborn Mice
04:46

Differentiation and Imaging of Brown Adipocytes from the Stromal Vascular Fraction of Interscapular Adipose Tissue from Newborn Mice

Published on: February 3, 2023

Integrator complex plays an essential role in adipose differentiation.

Yuichiro Otani1, Yusuke Nakatsu, Hideyuki Sakoda

  • 1Department of Medical Chemistry, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University, Japan.

Biochemical and Biophysical Research Communications
|March 26, 2013
PubMed
Summary

This study investigated the role of the Integrator complex in the process of adipose differentiation. Researchers found that two subunits of the Integrator complex, IntS6 and IntS11, are upregulated during the early stages of differentiation in 3T3-L1 preadipocytes. When these subunits were suppressed using siRNA, the cells failed to differentiate into mature adipocytes. This was confirmed by both morphological changes and reduced expression of genes specific to fat cells. The study also showed that PPARγ2, a key transcription factor in adipogenesis, was downregulated in the treated cells, but its forced expression could not restore differentiation. These results suggest that the Integrator complex plays an essential role in adipose differentiation, possibly through the processing of small nuclear RNAs. Further research is needed to fully understand the underlying mechanisms.

Keywords:
RNA processing in adipogenesisIntegrator complex function3T3-L1 cell differentiationadipocyte-specific gene expression

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Semi-Automated Isolation of the Stromal Vascular Fraction from Murine White Adipose Tissue Using a Tissue Dissociator
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Semi-Automated Isolation of the Stromal Vascular Fraction from Murine White Adipose Tissue Using a Tissue Dissociator

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Differentiation and Imaging of Brown Adipocytes from the Stromal Vascular Fraction of Interscapular Adipose Tissue from Newborn Mice
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Published on: May 19, 2023

Area of Science:

  • Cell differentiation mechanisms in developmental biology
  • Transcriptional regulation in molecular biology
  • Adipose tissue biology in endocrinology

Background:

Adipose differentiation is a complex process involving the sequential activation of transcriptional programs that lead to the formation of mature fat cells. Prior research has shown that this process is tightly regulated by a network of transcription factors and signaling pathways. However, the role of RNA processing complexes in this context remains less understood. While the involvement of PPARγ2 in adipogenesis is well established, the contribution of other regulatory factors is still being explored. The Integrator complex, known for its role in small nuclear RNA processing, has not been previously linked to adipose differentiation. This gap motivated researchers to investigate whether this complex might play a role in the differentiation process. Understanding the molecular mechanisms that govern adipogenesis is essential for addressing metabolic disorders. The study aimed to clarify the function of the Integrator complex in this context. Researchers focused on the expression patterns of specific subunits and their impact on differentiation outcomes. This work builds on existing knowledge of adipocyte biology while introducing a novel regulatory component.

Purpose Of The Study:

This study aimed to determine the role of the Integrator complex in adipose differentiation. Researchers focused on the expression of IntS6 and IntS11, two subunits of the Integrator complex, during the differentiation of 3T3-L1 preadipocytes. The specific problem addressed was the lack of understanding regarding the involvement of RNA processing complexes in adipogenesis. The motivation for this work stemmed from the observation that Integrator subunits were upregulated during the differentiation process. The researchers sought to establish whether this upregulation was functionally significant. They hypothesized that the Integrator complex might be necessary for the transition from preadipocytes to mature adipocytes. To test this, they used siRNA to suppress the expression of these subunits and observed the effects on differentiation. The study aimed to clarify the mechanism by which the Integrator complex contributes to adipogenesis.

Main Methods:

The researchers used 3T3-L1 preadipocytes as a model system to study adipose differentiation. They monitored the expression levels of IntS6 and IntS11 during the differentiation process using RNA analysis techniques. To assess the functional role of these subunits, they employed siRNA to suppress their expression in preadipocytes. Morphological assessments were conducted to evaluate the differentiation status of the cells. The expression of adipocyte-specific genes, such as Glut4, perilipin, and Fabp4, was analyzed using mRNA quantification. To determine whether PPARγ2 could compensate for the loss of Integrator subunits, the researchers used adenoviral vectors to force its expression. The differentiation capacity of the treated cells was compared to that of control cells. These methods allowed the researchers to establish a causal relationship between Integrator subunit expression and adipogenesis.

Main Results:

The study found that the expression levels of IntS6 and IntS11 increased during the early stages of adipose differentiation in 3T3-L1 cells. This upregulation occurred when the cells reached confluence and began to differentiate. After the completion of differentiation, the expression levels of these subunits returned to baseline. Suppression of IntS6 or IntS11 using siRNA significantly inhibited the differentiation of preadipocytes into mature adipocytes. Morphological analysis confirmed the reduced differentiation capacity in these cells. mRNA analysis showed decreased expression of adipocyte-specific genes, including Glut4, perilipin, and Fabp4. PPARγ2 protein levels were also reduced in the siRNA-treated cells. However, forced expression of PPARγ2 did not restore the differentiation capacity of the cells. These results suggest that the Integrator complex plays an essential role in adipose differentiation.

Conclusions:

The findings suggest that the Integrator complex is necessary for the differentiation of preadipocytes into mature adipocytes. The increased expression of IntS6 and IntS11 during the early stages of differentiation indicates a functional role for these subunits. The inhibition of differentiation following siRNA suppression supports this conclusion. The inability of PPARγ2 overexpression to rescue the differentiation defect implies that the Integrator complex operates independently of this transcription factor. The study highlights the importance of RNA processing mechanisms in adipogenesis. The researchers propose that the processing of U1 and U2 small nuclear RNAs may be involved in this process. Further investigation is needed to clarify the exact mechanism by which the Integrator complex contributes to adipose differentiation. These results provide a foundation for future studies on the molecular regulation of adipogenesis.

The Integrator complex is essential for adipose differentiation, as its subunits IntS6 and IntS11 are upregulated during the process and their suppression inhibits differentiation.

Researchers used siRNA to suppress IntS6 and IntS11 in 3T3-L1 preadipocytes and observed the effects on differentiation and gene expression.

PPARγ2 expression was reduced in cells with suppressed Integrator subunits, but forced PPARγ2 expression did not restore differentiation.

The study suggests that the processing of U1 and U2 small nuclear RNAs may be involved in adipose differentiation, based on the function of the Integrator complex.

mRNA levels of Glut4, perilipin, and Fabp4 were reduced in cells with suppressed Integrator subunits, indicating impaired differentiation.

The study implies that the Integrator complex is indispensable for adipose differentiation, and further research is needed to clarify its mechanism.