Cited by 324Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsInflammasome and immune disorders

Enhancing protective microglial activities with a dual function TREM2 antibody to the stalk region

Open access
Schlepckow, Kai, Monroe, Kathryn M, Kleinberger, Gernot, Cantuti‐Castelvetri, Ludovico, Parhizkar, Samira, Xia, Dan, Willem, Michael, Werner, Georg +20 more·2020·EMBO Molecular Medicine

Abstract

Triggering receptor expressed on myeloid cells 2 (TREM2) is essential for the transition of homeostatic microglia to a disease-associated microglial state. To enhance TREM2 activity, we sought to selectively increase the full-length protein on the cell surface via reducing its proteolytic shedding by A Disintegrin And Metalloproteinase (i.e., α-secretase) 10/17. We screened a panel of monoclonal antibodies against TREM2, with the aim to selectively compete for α-secretase-mediated shedding. Monoclonal antibody 4D9, which has a stalk region epitope close to the cleavage site, demonstrated dual mechanisms of action by stabilizing TREM2 on the cell surface and reducing its shedding, and concomitantly activating phospho-SYK signaling. 4D9 stimulated survival of macrophages and increased microglial uptake of myelin debris and amyloid β-peptide in vitro. In vivo target engagement was demonstrated in cerebrospinal fluid, where nearly all soluble TREM2 was 4D9-bound. Moreover, in a mouse model for Alzheimer's disease-related pathology, 4D9 reduced amyloidogenesis, enhanced microglial TREM2 expression, and reduced a homeostatic marker, suggesting a protective function by driving microglia toward a disease-associated state.

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Crossref · 10.15252/emmm.201911227

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  • Recent in vivo and in vitro models seem to support the idea that activation of Trem2 leads to reduced amyloidogenesis by a more efficient clearance, and promotes cell phagocytosis and survival, at least in mouse models.

    “recent in vivo and in vitro models seem to support the idea that activation of Trem2 leads to reduced amyloidogenesis by a more efficient clearance, and promotes cell phagocytosis and survival, at least in mouse models ([46], see more below)”

    From TREM2/PLCγ2 signalling in immune cells: function, structural insight, and potential therapeutic modulation (2021) · cites this paper as [46]

    The Results (page unavailable in our copy) report that the TREM2-stimulating antibody 4D9 reduced cortical plaque burden and soluble Aβ in mice, increased Aβ uptake by cultured mouse microglia, and improved survival of cultured mouse macrophages. The Discussion says the fate of engulfed Aβ is unknown, so the proposed explanation that more efficient clearance caused the reduction in amyloidogenesis is not established by this paper. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Administration of 4D9 in AD mouse model increased the level of TREM2 in microglia and reduced amyloidogenesis, though no changes to cognitive ability were reported.

    “Administration of 4D9 in AD mouse model increased the level of TREM2 in microglia and reduced amyloidogenesis,539 though no changes to cognitive ability were reported.”

    From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [539]

  • The opposite phenotypes observed in PLCG2 KO iMGs and Plcγ2-P522R KI mice support the notion to therapeutically stimulate TREM2 functions.

    “The opposite phenotypes observed in PLCG2 KO iMGs and Plcγ2-P522R KI mice also support the notion to therapeutically stimulate TREM2 functions [6, 16, 17, 43].”
  • TREM2 p.H157Y increases shedding from microglia, leading to phagocytosis deficits.

    “Increased shedding from microglia [45], leading to phagocytosis deficits [46]”
  • Other similar strategies, based on monoclonal antibodies (4D9), act via a dual mechanism: as direct agonists of TREM2 signalling, and by stabilizing TREM2 on the cell surface and reducing its shedding.

    “Other similar strategies, based on monoclonal antibodies (4D9), act via a dual mechanism: as direct agonists of the TREM2 signalling, and by stabilizing TREM2 on the cell surface and reducing its shedding [46]”

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Research works printed but not linked: 1

  1. Bradbury A (2010) Antibody engineering, Vol. 1 Berlin Heidelberg: Springer‐Verlag

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Authors
Schlepckow, K., Monroe, K. M., Kleinberger, G., Cantuti‐Castelvetri, L., Parhizkar, S., Xia, D., Willem, M., Werner, G., Pettkus, N., Brunner, B., Sülzen, A., Nuscher, B., Hampel, H., Xiang, X., Feederle, R., Tahirovic, S., Park, J. I., Prorok, R., Mahon, C., Liang, C., Shi, J., Kim, D. J., Sabelström, H., Huang, F., Di Paolo, G., Simons, M., Lewcock, J. W., & Haass, C.
Affiliations
  • German Center for Neurodegenerative Diseases (DE)
  • Denali Therapeutics (United States) (US)
  • Ludwig-Maximilians-Universität München (DE)
Corresponding author
  • Lewcock, Joseph W
  • Haass, Christian
Venue
EMBO Molecular Medicine
Published
2020-03-10
Volume
12
Issue
4
Pages
e11227-e11227
ISSN
  • 1757-4676 (ISSN-L)
  • 1757-4684
OpenAlex
W3012091890
Cited by
324
References
63
Citations by year
2026: 42 · 2025: 55 · 2024: 52 · 2023: 58 · 2022: 50 · 2021: 39 · 2020: 28
FWCI
16.91
Type
journal article
Language
en
Open access
Locations
  • EMBO Molecular Medicine (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Open access LMU (Ludwid Maxmilian's Universitat Munchen) (submittedVersion, cc-by)
  • mediaTUM (Technical University of Munich) (submittedVersion)
  • DZNE Pub (submittedVersion, other-oa)
  • Zenodo (CERN European Organization for Nuclear Research) (submittedVersion, cc-by)
Funders
  • Deutsche Forschungsgemeinschaft (EXC 2145; ID 390857198 SyNergy, HA1737/16‐1)
  • Helmholtz Association (ZT‐0027)
  • Dr. Miriam and Sheldon G. Adelson Medical Research Foundation
  • Innovative Medicines Initiative (115976)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
Keywords
TREM2, microglia, antibody therapy, Syk signaling, disease-associated microglia, macrophage survival, amyloid-beta, Alzheimer's disease, soluble TREM2, cerebrospinal fluid
MeSH terms
Animals, Antibodies, Monoclonal, Female, Macrophages, Membrane Glycoproteins, Multiple Myeloma, Receptors, Immunologic, Amyloid beta-Peptides, Rats, Wistar, Microglia, Cell Line, Tumor, Mice, Rats

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