Cited by 17Amyotrophic Lateral Sclerosis ResearchAutophagy in Disease and TherapyAlzheimer's disease research and treatments

Reduction of nemo-like kinase increases lysosome biogenesis and ameliorates TDP-43–related neurodegeneration

Open access
Tejwani, Leon, Jung, Youngseob, Kokubu, Hiroshi, Sowmithra, Sowmithra, Ni, Luhan, Lee, Changwoo, Sanders, Benjamin, Lee, Paul J. +12 more·2023·Journal of Clinical Investigation

Published version of a preprint

Abstract

Protein aggregation is a hallmark of many neurodegenerative disorders, including amyotrophic lateral sclerosis (ALS). Although mutations in TARDBP, encoding transactive response DNA-binding protein 43 kDa (TDP-43), account for less than 1% of all ALS cases, TDP-43-positive aggregates are present in nearly all ALS patients, including patients with sporadic ALS (sALS) or carrying other familial ALS-causing (fALS-causing) mutations. Interestingly, TDP-43 inclusions are also present in subsets of patients with frontotemporal dementia, Alzheimer's disease, and Parkinson's disease; therefore, methods of activating intracellular protein quality control machinery capable of clearing toxic cytoplasmic TDP-43 species may alleviate disease-related phenotypes. Here, we identify a function of nemo-like kinase (Nlk) as a negative regulator of lysosome biogenesis. Genetic or pharmacological reduction of Nlk increased lysosome formation and improved clearance of aggregated TDP-43. Furthermore, Nlk reduction ameliorated pathological, behavioral, and life span deficits in 2 distinct mouse models of TDP-43 proteinopathy. Because many toxic proteins can be cleared through the autophagy/lysosome pathway, targeted reduction of Nlk represents a potential approach to therapy development for multiple neurodegenerative disorders.

AI snapshot

Written from the paper’s full text.

TL;DR

Nemo-like kinase (Nlk) is identified as a negative regulator of lysosome biogenesis; reducing Nlk increases lysosomal gene expression and clearance of aggregated TDP-43. Genetic or antisense oligonucleotide–mediated Nlk reduction ameliorated pathology, behavior, and survival in two TDP-43 mouse models.

Key findings

  • Nlk knockout in N2a cells increased lysosome number and proteolytic activity, promoted CLEAR-network transcription, and increased LC3-II/LC3-I with decreased p62; NLK+/– human iPSC-derived motor neurons expressed higher CTSA, CTSD, LAMP1, and LAMP2.
  • Nlk overexpression reduced nuclear Tfeb in a kinase activity–dependent manner; MG132 restored nuclear Tfeb, indicating Nlk destabilizes nuclear Tfeb via the nuclear proteasome without altering mTOR targets or Tfeb S122/S142 phosphorylation.
  • Nlk reduction decreased full-length and truncated TDP-43 in cells and decreased insoluble TDP-43 fractions in mouse spinal cord without affecting soluble TDP-43; Nlk did not physically interact with TDP-43.
  • In Prp-TDPA315T/+ mice, 50% genetic Nlk reduction increased median survival by about 20% in males and females and increased motor neuron Lamp1-positive lysosomes; in Thy1-TDPTg/Tg mice, P1 10 μg Nlk ASO reduced Nlk mRNA by 90% in cortex and 75% in spinal cord at P19 and increased median life span by 21%.

Methods

  • Used N2a and NSC-34 cells, CRISPR/Cas9 Nlk-knockout N2a clones, RNA-Seq/GSEA/ToppCluster/IPA, luciferase reporters, Western blotting, subcellular fractionation, LysoTracker and DQ BSA assays, and CRISPR-mutated NLK+/– hiPSC-derived motor neurons.
  • Used two Nlk loss-of-function mouse lines crossed with Prp-TDPA315T/+ mice, plus Thy1-TDPTg/Tg mice treated with P1 intracerebroventricular Nlk ASO; assessed survival, motor behavior, immunostaining, and detergent-fractionated TDP-43.
  • Statistical analysis used two-tailed unpaired Student’s t test or one-way ANOVA with multiple comparisons; P < 0.05 was significant.

Limitations

  • The paper states that genetic and pharmacological Nlk reduction occurred prenatally or at P1, so benefits may reflect altered disease onset and/or progression; it calls for future comparison across disease stages and for determining the effective therapeutic time window.
  • The paper notes that survival improvement was only around 20% and that the TDP-43 mouse models may have premature lethality driven by gastrointestinal or other non-neurological transgene effects, requiring models where neurodegeneration primarily drives lethality.
  • The paper states that comprehensive lysosomal health/function beyond immunostaining for a single lysosomal membrane marker is needed; the text also makes evident that evidence is from rodent models and cell systems, with no human clinical data.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1172/jci138207

Cites

75 of 75 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

15 of 16 cited sources checked · 10 supported · 0 flagged · accuracy not yet measured

  • Premisecitation

    Mice with postnatal whole-body conditional ablation of Nlk are grossly normal.

    “and mice with postnatal whole-body conditional ablation of Nlk are grossly normal (57)”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [57] source

      The Results (‘Decreased expression of Nlk reduces Pgrn levels in vivo’; page unavailable) describe tamoxifen-induced conditional deletion of Nlk in all cell types beginning at six weeks of age. They report reduced cortical Nlk and Pgrn levels, but do not say that these mice were grossly normal. The normal behavioral findings elsewhere in the Results concern Nlk heterozygotes, not the conditionally ablated mice. (LLM, conf=0.84)

      Experimental — accuracy not yet measured
  • Findingown data

    Nlk reduction improves survival in 2 independent TDP-43 animal models.

    “The therapeutic benefits of Nlk reduction on motor behavior, neurodegeneration and its associated astrogliosis, and survival of 2 independent TDP-43 animal models”
    Quote in the paperSubstantial claim
  • Findingown data

    Nlk reduction improves motor behavior in 2 independent TDP-43 animal models.

    “The therapeutic benefits of Nlk reduction on motor behavior, neurodegeneration and its associated astrogliosis, and survival of 2 independent TDP-43 animal models”
    Quote in the paperSubstantial claim
  • Findingnone given

    Pathological rescue of TDP-43-related neurodegeneration and gliosis upon Nlk reduction was to near nontransgenic control levels.

    “although the pathological rescue of TDP-43–related neurodegeneration and gliosis upon Nlk reduction was to near nontransgenic control levels”
    Quote in the paperSubstantial claim
  • Findingown data

    The observed improvement in survival in both TDP-43 transgenic mouse models was only around 20%.

    “the observed improvement in survival in both TDP-43 transgenic mouse models was only around 20%”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim. 15
  • May combine two claims. 10
  • The quote only partly states this claim. 2
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    NLK phosphorylates AR and ataxin-1, the proteins mutated to cause SBMA and SCA1, respectively.

    “We have previously reported that NLK phosphorylates AR and ataxin-1, the proteins mutated to cause SBMA and SCA1, respectively”
    Quote in the paperNot a substantial claim2 of 2 sources checked
    • cites [7] source

      The Results section, “NLK phosphorylates ATXN1” (page unavailable), reports that NLK induced ATXN1 phosphorylation in cultured cells; the Discussion notes that this could be direct or indirect. Our copy does not report NLK phosphorylating the androgen receptor (AR), so it supports only the ataxin-1 part of the claim. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
    • cites [8] source
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Phosphorylation of AR and ataxin-1 contributes to pathogenicity.

    “and that phosphorylation of these proteins contributes to pathogenicity (7, 8).”
    Quote in the paperNot a substantial claim2 of 2 sources checked
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductcitation

    Cell lines were routinely tested for mycoplasma contamination by PCR and positive samples were discarded.

    “Cells were routinely tested for mycoplasma contamination by PCR as previously described (58) using primers for-GGCGAATGGGTGAGTAACACG and rev-CGGATAACGCTTGCGACCTATG. Any mycoplasma-positive samples were immediately discarded.”
    Quote in the paperNot a substantial claim1 of 1 sources checked
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    ASOs can specifically alter levels and/or processing of a variety of proteins involved in neurodegenerative diseases, most of which have been the disease-causing protein itself.

    “Due to the precision afforded by complementary binding of an ASO to its target transcript of interest, ASOs have emerged as an invaluable tool in specifically altering levels and/or processing of a variety of proteins involved in neurodegenerative diseases, most of which have been the disease-causing protein itself (38, 51–54).”
    Quote in the paperNot a substantial claim5 of 5 sources checked
    • cites [38] source
    • cites [51] source
    • cites [52] source
    • cites [53] source
    • cites [54] source

      The paper reports that sequence-specific ASO7 lowered the disease-causing ATXN2 protein in SCA2 models and discusses ASO approaches for other neurodegenerative diseases. It does not establish that most ASO targets across those diseases are the disease-causing proteins, or document altered protein processing. The supplied passages are labeled Abstract and have no page numbers. (LLM, conf=0.83)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Premisecitation

    Mice with partial genetic reduction of Nlk display no pathological (neurodegenerative or inflammatory), survival, or cognitive changes up to 52 weeks.

    “mice with partial genetic reduction of Nlk display no pathological (neurodegenerative or inflammatory), survival, or cognitive changes up to 52 weeks (57)”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [57] source

      The Results sections report no significant microglial changes or elevated-plus-maze behavioral phenotype in Nlk+/– mice alone at one year, compared with wild-type controls. They do not establish unchanged survival or explicitly report normal cognitive performance for Nlk+/– mice alone; the reported Morris water maze impairment concerns Nlk+/– Grn+/– mice. Thus, the claim is broader than the findings in our copy. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Premisecitation

    Pathological TDP-43 aggregation and premature polyadenylation and loss of stathmin-2 are pathologies commonly observed across sALS and fALS.

    “alternative approaches that mitigate pathologies commonly observed across sALS and fALS, such as pathological TDP-43 aggregation (39) or premature polyadenylation and loss of stathmin-2, a key regulator of microtubule dynamics in motor neurons (55, 56), are highly desirable.”
    Quote in the paperSubstantial claim3 of 3 sources checked
    • cites [39] source
    • cites [55] source
    • cites [56] source

      The Results sections on postmortem ALS spinal cord and mutant TDP-43 motor neurons report reduced STMN2 in sporadic cases and in patient-derived motor neurons. The paper links STMN2 loss to cryptic-exon splicing, but the passages do not establish premature polyadenylation. Its Discussion also notes that FUS-mutant patients do not display TDP-43 pathology, so the claim's broad framing across sporadic and familial ALS needs qualification. TDP-43 aggregation is separately cited to reference 39 in the citing sentence. (LLM, conf=0.87)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Findingown data

    Nlk reduction reduces neurodegeneration and associated astrogliosis in 2 independent TDP-43 animal models.

    “The therapeutic benefits of Nlk reduction on motor behavior, neurodegeneration and its associated astrogliosis, and survival of 2 independent TDP-43 animal models”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationown data

    Nlk reduction provides proof-of-principle evidence for this approach in TDP-43 proteinopathies, both when TARDBP mutations are present and when TARDBP mutations are not present but TDP-43 aggregation occurs.

    “provide strong proof-of-principle evidence for this approach in TDP-43 proteinopathies, both in instances in which TARDBP mutations are present (a subset of ALS patients) and when TARDBP mutations are not present but TDP-43 aggregation occurs.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim.

    Study design and conductnone given

    Microscope acquisition parameters were identical for all images in the LysoTracker live-cell imaging experiments.

    “Cells were maintained in Live Cell Imaging Solution (Invitrogen) at 37°C in 5% CO2 during image acquisition, and microscope acquisition parameters for all images were identical.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    The experimenter was blind to animal genotype and ASO treatment during behavioral assessment.

    “The experimenter was blind to animal genotype and ASO treatment.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim. May combine two claims.

    Study design and conductnone given

    At least 3 animals were examined for all histological analyses, with at least three to nine 30 μm sections from comparable brain or spinal cord regions quantified per animal.

    “For all histological analyses, at least 3 animals were examined, with at least three to nine 30 μm sections from comparable brain/spinal cord regions quantified per animal.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    The experimenter was blind to animal genotype and ASO treatment during image acquisition and quantification of histological analyses.

    “The experimenter was blind to animal genotype and ASO treatment during image acquisition and quantification.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Study design and conductnone given

    Lysosome number per cell was blindly quantified and normalized by cell area in LysoTracker imaging.

    “Lysosome number per cell was blindly quantified and normalized by cell area.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim. The quote only partly states this claim.

    Study design and conductown data

    Equal protein amounts were loaded for SDS-PAGE and Western blot analysis.

    “Total protein concentrations of isolated protein lysates were quantified using the BCA Protein Assay Kit (Thermo Fisher), and equal protein amounts were boiled at 95°C for 10 minutes, loaded, and analyzed by SDS-PAGE.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    Microscope acquisition parameters were identical for all images in the DQ BSA live-cell imaging experiments.

    “Microscope acquisition parameters for all images were identical.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    RNA integrity was assessed with RIN values before sequencing to ensure high RNA integrity.

    “RNA integrity was measured using an Agilent Bioanalyzer 2100 (Agilent Technologies), and RIN values were assessed to ensure high RNA integrity before sequencing.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductnone given

    All luciferase reporter experiments were repeated in triplicate and performed at least 3 times.

    “All experiments were repeated in triplicate and performed at least 3 times.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim. The quote only partly states this claim.

    Study design and conductnone given

    Lysosome number per cell was blindly quantified in DQ BSA assays.

    “Lysosome number per cell was blindly quantified.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductnone given

    Stitched images were deidentified and randomized before quantification of NeuN-positive layer V cortical neurons.

    “Briefly, following acquisition and stitching of a 3 × 3 tiled array of ×20 images, stitched images were deidentified and randomized.”
    Quote in the paperNot a substantial claim
19 of 19
  • The paper relies on this without support.

    There is no physical interaction between NLK and TDP-43 (or no evidence for it).

    “as there is no evidence for a physical interaction between NLK and TDP-43.”
  • The paper relies on this without support.

    In ALS, the vast majority of patients have a sporadic form of the disease in which a genetic etiology is not identifiable.

    “In the case of ALS, the vast majority of patients have a sporadic form of the disease in which a genetic etiology is not identifiable”
  • The paper relies on this without support.

    No known neurological condition in humans has been associated with a reduction of Nlk.

    “Because no known neurological condition in humans has been associated with a reduction of Nlk”
  • The paper relies on this without support.

    The animals used in the present study have not been reported to display overt impairments in autophagy/lysosome function.

    “the animals used in the present study have not been reported to display overt impairments in autophagy/lysosome function”
  • The paper relies on this without support.

    NLK has not been previously identified in genetic screens of modulators of TDP-43 toxicity.

    “NLK has not been previously identified in genetic screens of modulators of TDP-43 toxicity.”
5 of 5

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • NLK depletion mitigates disease phenotypes in Drosophila and murine models of ALS, murine models of spinobulbar muscular atrophy, and murine models of spinocerebellar ataxia.

    “NLK depletion mitigates disease phenotypes not just in Drosophila and murine models of ALS, but also murine models of spinobulbar muscular atrophy, and murine models of spinocerebellar ataxia (15–17).”

    From Nemo-like kinase disrupts nuclear import and drives TDP43 mislocalization in ALS (2025) · cites this paper as [16]

    The Results section reports that Nlk reduction improved survival and disease phenotypes in TDP-43 mouse models. The Introduction reports earlier alleviation of disease phenotypes in SCA1 and SBMA animal models. Our copy does not report a Drosophila ALS model, so that part of the claim is unsupported by this source. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • NLK interacts with several proteins associated with neurodegenerative diseases, including poly-Q expanded androgen receptor in spinobulbar muscular atrophy (SBMA) and ataxin-1 in spinocerebellar ataxia 1 (SCA1).

    “NLK interacts with several proteins associated with neurodegenerative diseases, including poly-Q expanded androgen receptor in spinobulbar muscular atrophy (SBMA) and ataxin-1 in spinocerebellar ataxia 1 (SCA1) (16, 17); accumulations of these proteins may also contribute to changes in NLK expression and/or activity.”
  • Nlk haploinsufficiency (Nlk+/−) is protective in several neurodegenerative disease models, including TDP43-overexpressing mice.

    “Conditional Nlk knockout in adult animals is well-tolerated, however (59), and Nlk haploinsufficiency (Nlk+/−) is protective in several neurodegenerative disease models, including TDP43-overexpressing mice (15–18).”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Tejwani, L., Jung, Y., Kokubu, H., Sowmithra, S., Ni, L., Lee, C., Sanders, B., Lee, P. J., Xiang, Y., Luttik, K., Soriano, A., Yoon, J., Park, J., Ro, H. H., Ju, H., Liao, C., Tieze, S. M., Rigo, F., Jafar-Nejad, P., & Lim, J.
Affiliations
  • Yale University (US)
  • Ionis Pharmaceuticals (United States) (US)
Venue
Journal of Clinical Investigation
Published
2023-08-15
Volume
133
Issue
16
ISSN
  • 0021-9738 (ISSN-L)
  • 1558-8238
OpenAlex
W4382632516
Cited by
17
References
75
Citations by year
2026: 5 · 2025: 6 · 2024: 4 · 2023: 1 · 2021: 1
FWCI
2.33
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institute of Neurological Disorders and Stroke (NS083706,NS088321,NS007224)
  • National Institute of Mental Health (MH119803)
  • Lo Graduate Fellowship for Excellence in Stem Cell Research (N/A)
  • Gruber Science Fellowship (N/A)
  • Yale College First-Year Fellowship in the Sciences & Engineering (N/A)
  • National Institute on Aging (AG066447,AG076154,AG074609)
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
Nemo-like kinase, lysosomal biogenesis, TDP-43, TDP-43 proteinopathy, amyotrophic lateral sclerosis, protein aggregation, autophagy-lysosome pathway, protein quality control, neurodegeneration, frontotemporal dementia, Alzheimer's disease, Parkinson's disease, therapeutic target
MeSH terms
Amyotrophic Lateral Sclerosis, Animals, DNA-Binding Proteins, Humans, Lysosomes, Protein Serine-Threonine Kinases, Neurodegenerative Diseases, Mice

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-18.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-18.

Cited sources are checked by gpt-6-sol.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review