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Systemic leukocyte-directed siRNA delivery revealing cyclin D1 as an anti-inflammatory target

Dan Peer1, Eun Jeong Park, Yoshiyuki Morishita

  • 1Immune Disease Institute and Department of Anesthesia, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.

Science (New York, N.Y.)
|February 2, 2008
PubMed

Insights

This study reveals Cyclin D1 (CyD1) as a potential anti-inflammatory target. Silencing CyD1 in leukocytes reversed experimental colitis by reducing inflammation and immune cell proliferation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Nanomedicine

Background:

  • Cyclin D1 (CyD1) is a key cell cycle regulator and cancer target.
  • CyD1 is upregulated in inflammation, but its role is unclear.

Purpose of the Study:

  • To investigate the role of CyD1 in inflammation.
  • To develop a targeted approach for CyD1 inhibition in leukocytes.

Main Methods:

  • Developed targeted stabilized nanoparticles (tsNPs) loaded with CyD1-small interfering RNA (siRNA).
  • Used beta(7) integrin antibodies to target specific leukocyte subsets in vivo.
  • Administered beta(7) I-tsNPs systemically to mice with experimentally induced colitis.

Main Results:

  • Successfully silenced CyD1 in leukocytes using targeted tsNPs.
  • Reversed experimental colitis in mice.
  • Demonstrated suppression of leukocyte proliferation and T helper cell 1 cytokine expression.

Conclusions:

  • Cyclin D1 is a viable anti-inflammatory target.
  • Targeted siRNA delivery via tsNPs is a feasible therapeutic strategy for inflammatory diseases.

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