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Notch signaling regulates M2 type macrophage polarization during the development of proliferative vitreoretinopathy

Jingjing Zhang1, Qingjun Zhou2, Gongqiang Yuan1

  • 1Shandong Eye Hospital, Shandong Eye Institute, Shandong Academy of Medical Sciences, Jinan, China.

Cellular Immunology
|September 28, 2015
PubMed

Insights

Notch signaling drives M2 macrophage polarization, a key factor in proliferative vitreoretinopathy (PVR). Inhibiting Notch signaling reduces PVR development and M2 macrophage infiltration, suggesting a therapeutic target for PVR.

Area of Science:

  • Ophthalmology
  • Immunology
  • Cell Biology

Background:

  • Macrophages are implicated in proliferative vitreoretinopathy (PVR) pathogenesis.
  • M2 macrophages contribute to tissue remodeling and repair processes.
  • CD206-positive M2 macrophages are present in preretinal membranes in a mouse model of PVR.

Purpose of the Study:

  • To investigate the role of Notch signaling in M2 macrophage polarization in PVR.
  • To determine if inhibiting Notch signaling affects PVR formation and M2 macrophage infiltration.

Main Methods:

  • Induction of PVR in a mouse model via intravitreal injection of retinal pigment epithelial (RPE) cells.
  • Administration of a γ-secretase inhibitor (DAPT) to block Notch signaling.
  • Assessment of PVR markers (α-SMA) and M2 macrophage markers (CD206, Arg-1).

Main Results:

  • Inhibition of Notch signaling with DAPT reduced PVR formation.
  • DAPT treatment decreased the expression of α-SMA, a marker of fibrosis.
  • M2 type macrophage infiltration was inhibited, evidenced by reduced Arg-1 expression.

Conclusions:

  • Notch signaling pathway plays a crucial role in modulating PVR formation.
  • Notch signaling influences PVR by regulating M2 type macrophage polarization.
  • Targeting Notch signaling may offer a therapeutic strategy for PVR.
Keywords:
MacrophagesNotch signalingProliferative vitreoretinopathyRetinal pigment epithelial cellsWound healing

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