Cited by 42Drug Transport and Resistance MechanismsRNA Interference and Gene DeliveryCellular transport and secretion

IFITM proteins assist cellular uptake of diverse linked chemotypes

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Lou, Kevin, Wassarman, Douglas R., Yang, Tangpo, Paung, YiTing, Zhang, Ziyang, O’Loughlin, Thomas A., Moore, Megan K., Egan, Regina K. +6 more·2022·Science

Abstract

The search for cell-permeable drugs has conventionally focused on low-molecular weight (MW), nonpolar, rigid chemical structures. However, emerging therapeutic strategies break traditional drug design rules by employing flexibly linked chemical entities composed of more than one ligand. Using complementary genome-scale chemical-genetic approaches we identified an endogenous chemical uptake pathway involving interferon-induced transmembrane proteins (IFITMs) that modulates the cell permeability of a prototypical biopic inhibitor of MTOR (RapaLink-1, MW: 1784 g/mol). We devised additional linked inhibitors targeting BCR-ABL1 (DasatiLink-1, MW: 1518 g/mol) and EIF4A1 (BisRoc-1, MW: 1466 g/mol), uptake of which was facilitated by IFITMs. We also found that IFITMs moderately assisted some proteolysis-targeting chimeras and examined the physicochemical requirements for involvement of this uptake pathway.

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  • CRISPRi experiments in other cancer cell types (AML, CML, pancreatic cancer and lung cancer cell lines) demonstrated that, unlike PSMA1, PTGES3 is not an essential gene upon knockdown.

    “Furthermore, CRISPRi experiments in other cancer cell types (AML, CML, pancreatic cancer and lung cancer cell lines54–56) demonstrated that, unlike PSMA1, which is a positive control commonly essential gene, PTGES3 is not an essential gene upon knockdown (Extended Data Fig. 10d–g).”

    From Genome-scale CRISPR screens identify PTGES3 as a direct modulator of androgen receptor function in advanced prostate cancer (2025) · cites this paper as [55]

    The section on complementary genome-scale chemical-genetic approaches reports CRISPRi experiments in K562 chronic myeloid leukemia cells, supporting the CML portion of the cited cell-line description (page unavailable). It does not report PTGES3 or PSMA1 knockdown essentiality, or CRISPRi experiments in the other cancer cell types named in the claim. (LLM, conf=0.83)

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Authors
Lou, K., Wassarman, D. R., Yang, T., Paung, Y., Zhang, Z., O’Loughlin, T. A., Moore, M. K., Egan, R. K., Greninger, P., Benes, C. H., Seeliger, M. A., Taunton, J., Gilbert, L. A., & Shokat, K. M.
Affiliations
  • Howard Hughes Medical Institute (US)
  • University of California, San Francisco (US)
  • Stony Brook University (US)
  • Massachusetts General Hospital (US)
  • Harvard University (US)
Corresponding author
  • Gilbert, Luke A.
  • Shokat, Kevan M.
Venue
Science
Published
2022-12-09
Volume
378
Issue
6624
Pages
1097-1104
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W4311883476
Cited by
42
References
75
Citations by year
2026: 12 · 2025: 14 · 2024: 6 · 2023: 9 · 2022: 1
FWCI
3.14
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Science (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion, cc-by)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • Howard Hughes Medical Institute
  • Wellcome Trust (102696)
  • National Institutes of Health (5f31ca243439-02, 1s10od028478-01, 1s10od028511-01)
  • National Cancer Institute (R01CA221969, DP2CA239597, F30CA239476, F31-CA243439, R01CA244550)
  • National Institute of General Medical Sciences (R35GM119437, T32GM145460)
  • National Institute of Allergy and Infectious Diseases (U19AI171110)
Topics
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
interferon-induced transmembrane proteins, membrane permeability, mTOR inhibitors, BCR-ABL1 inhibitor, PROTACs, high molecular weight drugs, drug delivery

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