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Updated: Apr 21, 2026

RNA Pull-down Procedure to Identify RNA Targets of a Long Non-coding RNA
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RNA Pull-down Procedure to Identify RNA Targets of a Long Non-coding RNA

Published on: April 10, 2018

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The functional characterization of long noncoding RNA SPRY4-IT1 in human melanoma cells

Joseph Mazar1, Wei Zhao1, Ahmad M Khalil2

  • 1Sanford-Burnham Medical Research Institute, Orlando, FL 32827, USA.

Oncotarget
|October 27, 2014
PubMed

Insights

The long noncoding RNA SPRY4-IT1 is highly expressed in melanoma. Knocking down SPRY4-IT1 triggers apoptosis by altering lipid metabolism through its interaction with lipin 2.

Area of Science:

  • Molecular biology
  • Cancer research
  • Lipidomics

Background:

  • The long noncoding RNA (lncRNA) SPRY4-IT1 shows low expression in normal melanocytes but is upregulated in melanoma.
  • SPRY4-IT1 knockdown inhibits melanoma cell invasion and proliferation while promoting apoptosis.

Purpose of the Study:

  • To investigate the functional role of SPRY4-IT1 in melanoma.
  • To identify proteins interacting with SPRY4-IT1.
  • To elucidate the molecular mechanisms underlying SPRY4-IT1's effect on melanoma cell behavior.

Main Methods:

  • Affinity purification of SPRY4-IT1 from melanoma cells.
  • Mass spectrometry to identify binding partners.
  • siRNA knockdown of SPRY4-IT1.
  • Shotgun lipidomics to analyze cellular lipid profiles.
  • Western blotting to assess protein levels.

Main Results:

  • Lipin 2 was identified as a key binding partner of SPRY4-IT1.
  • SPRY4-IT1 knockdown led to increased lipin 2 protein accumulation and upregulated DGAT2 expression.
  • Lipidomic analysis revealed significant changes in lipid species, including increased acyl carnitine, fatty acyl chains, and triacylglycerol (TAG) upon SPRY4-IT1 knockdown.
  • SPRY4-IT1 knockdown induced significant alterations in cellular lipid profiles.

Conclusions:

  • SPRY4-IT1 interacts with lipin 2, influencing lipid metabolism in melanoma cells.
  • Knockdown of SPRY4-IT1 induces changes in lipid metabolism, potentially leading to lipotoxicity and apoptosis.
  • These findings suggest SPRY4-IT1 as a potential therapeutic target in melanoma treatment.

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