Cited by 61Neuroinflammation and Neurodegeneration MechanismsPhagocytosis and Immune RegulationAlzheimer's disease research and treatments

Pan-SHIP1/2 inhibitors promote microglia effector functions essential for CNS homeostasis

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Pedicone, Chiara, Fernandes, Sandra, Dungan, Otto M., Dormann, Shawn M., Viernes, Dennis R., Adhikari, Arijit A., Choi, Lydia B., De Jong, Ebbing P. +2 more·2020·Journal of Cell Science

Abstract

We show here that both SHIP1 (Inpp5d) and its paralog SHIP2 (Inppl1) are expressed at protein level in microglia. To examine whether targeting of SHIP paralogs might influence microglial physiology and function, we tested the capacity of SHIP1-selective, SHIP2-selective and pan-SHIP1/2 inhibitors for their ability to impact on microglia proliferation, lysosomal compartment size and phagocytic function. We find that highly potent pan-SHIP1/2 inhibitors can significantly increase lysosomal compartment size, and phagocytosis of dead neurons and amyloid beta (Aβ)1−42 by microglia in vitro. We show that one of the more-potent and water-soluble pan-SHIP1/2 inhibitors, K161, can penetrate the blood-brain barrier. Consistent with this, K161 increases the capacity of CNS-resident microglia to phagocytose Aβ and apoptotic neurons following systemic administration. These findings provide the first demonstration that small molecule modulation of microglia function in vivo is feasible, and suggest that dual inhibition of the SHIP1 and 2 paralogs can provide a novel means to enhance basal microglial homeostatic functions for therapeutic purposes in Alzheimer's disease and, possibly, other types of dementia where increased microglial function could be beneficial.

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Crossref · 10.1242/jcs.238030

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  • Constitutive deletion or pharmacologic inhibition of SHIP1 increases phagocytosis of various substances, including zymosan in SHIP1 knockout macrophages and Aβ in SHIP1 inhibitor-treated microglia.

    “Constitutive deletion or pharmacologic inhibition of SHIP1 increases phagocytosis of various substances, including zymosan in SHIP1 knockout (KO) macrophages and Aβ in SHIP1 inhibitor-treated microglia.12,13”

    From Microglial <i>INPP5D</i> limits plaque formation and glial reactivity in the PSAPP mouse model of Alzheimer's disease (2023) · cites this paper as [12]

    The paper reports increased Aβ1–42 phagocytosis in microglia treated with pan-SHIP1/2 inhibitors (indexed copy, section labeled ABSTRACT; page unavailable). It also says SHIP1 limits macrophage phagocytosis, but does not establish the claimed zymosan result in SHIP1-knockout macrophages. The effective microglial treatments inhibited both SHIP1 and SHIP2; the paper says SHIP1-selective inhibition did not significantly improve microglial phagocytic function. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Phagocytosis was increased in microglia that lacked Inpp5d.

    “We found that phagocytosis was increased in microglia that lacked Inpp5d (Figure 3H), in line with previous reports in the literature.12”

    From Microglial <i>INPP5D</i> limits plaque formation and glial reactivity in the PSAPP mouse model of Alzheimer's disease (2023) · cites this paper as [12]

    The passage on dead-neuron uptake (indexed as ABSTRACT; page unavailable) reports increased microglial phagocytosis with a pan-SHIP1/2 inhibitor. It does not report phagocytosis in microglia lacking Inpp5d; only the dual inhibitor, not the SHIP1-selective inhibitor, produced a significant increase in that experiment. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Microglia with decreased Inpp5d or in the presence of a SHIP1 inhibitor demonstrated increased phagocytosis.

    “Moreover, microglia with decreased Inpp5d or in the presence of a SHIP1 inhibitor, demonstrated increased phagocytosis.12,13”

    From Microglial <i>INPP5D</i> limits plaque formation and glial reactivity in the PSAPP mouse model of Alzheimer's disease (2023) · cites this paper as [12]

    The indexed passage describing the dead-neuron uptake experiments reports increased phagocytosis with the pan-SHIP1/2 inhibitor K118. It also says that the SHIP1-selective inhibitor 3AC did not significantly increase uptake. The paper identifies Inpp5d as SHIP1 but does not report increased phagocytosis in microglia with decreased Inpp5d expression. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Pharmacological inhibition of INPP5D increases microglial proliferation and phagocytic uptake of Aβ peptide and alleviates neuronal loss.

    “Pharmacological inhibition of INPP5D has been shown previously to increase microglial proliferation and phagocytic uptake of Aβ peptide and alleviate neuronal loss.14”

    From <i>INPP5D</i> deficiency attenuates amyloid pathology in a mouse model of Alzheimer's disease (2023) · cites this paper as [14]

    The Results passages (page not provided) report increased microglial proliferation with pan-SHIP1/2 inhibition and increased uptake of Aβ peptide. They also report uptake of neurons that were already dead or apoptotic, not alleviation of neuronal loss. The proliferation result concerns inhibition of both SHIP1 (INPP5D) and SHIP2; SHIP1-selective inhibition did not increase proliferation. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • Pharmacological inhibition of SHIP1 and knockout of Inpp5d in mice increased the phagocytosis of apoptotic neurons and Aβ42, though plaque burden still increased.

    “In agreement with SHIP1’s role in inhibiting phagocytosis, pharmacological inhibition of SHIP1 and knockout of Inpp5d in mice increased the phagocytosis of apoptotic neurons and Aβ42, though plaque burden still increased [135, 136].”

    From Microglial function, INPP5D/SHIP1 signaling, and NLRP3 inflammasome activation: implications for Alzheimer’s disease (2023) · cites this paper as [135]

    The paper reports that the pan-SHIP1/2 inhibitor K161 increased microglial uptake of apoptotic neurons and Aβ1–42 after administration to mice (indexed ABSTRACT; page unavailable). It does not report that Inpp5d knockout increased phagocytosis or that plaque burden increased. It also distinguishes dual SHIP1/2 inhibition from SHIP1-selective inhibition, which did not significantly increase dead-neuron uptake. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

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Authors
Pedicone, C., Fernandes, S., Dungan, O. M., Dormann, S. M., Viernes, D. R., Adhikari, A. A., Choi, L. B., De Jong, E. P., Chisholm, J. D., & Kerr, W. G.
Affiliations
  • SUNY Upstate Medical University (US)
  • Syracuse University (US)
  • SUNY Upstate Medical University 3 Proteomics and Mass Spectrometry Core Facility , , Syracuse, NY , 13210, USA
Venue
Journal of Cell Science
Published
2020-01-10
Volume
133
Issue
5
ISSN
  • 0021-9533 (ISSN-L)
  • 1477-9137
OpenAlex
W2991552355
Cited by
61
References
86
Citations by year
2026: 9 · 2025: 6 · 2024: 13 · 2023: 16 · 2022: 7 · 2021: 8 · 2020: 2
FWCI
1.87
Type
journal article
Language
en
Open access
Locations
  • Journal of Cell Science (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • National Institutes of Health
  • National Institute on Aging
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
SHIP1, SHIP2, microglia, phagocytosis, amyloid-beta, blood-brain barrier penetration, CNS homeostasis, Alzheimer's disease, dementia, microglial proliferation
MeSH terms
Alzheimer Disease, Homeostasis, Humans, Phagocytosis, Amyloid beta-Peptides, Microglia

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