Endocytosis of ALK promotes glucose uptake in ALK -amplified neuroblastoma

Verdict. We recently identified a noncanonical mechanism in which RTK-containing endocytic vesicles deliver extracellular glucose to hexokinases associated with the outer mitochondrial membrane, thereby promoting cellular glucose uptake. It intersects mitochondrial stress/dysfunction themes (functional impairment; cancer; systemic metabolic stress).

What the authors report

Activated receptor tyrosine kinases (RTKs), such as epidermal growth factor receptor (EGFR) and anaplastic lymphoma kinase (ALK), trigger intracellular signaling while undergoing receptor endocytosis. Whether this mechanism contributes to cancer metabolism, however, remains unknown.

Key results stated in the abstract include the following. We recently identified a noncanonical mechanism in which RTK-containing endocytic vesicles deliver extracellular glucose to hexokinases associated with the outer mitochondrial membrane, thereby promoting cellular glucose uptake. Here, using neuroblastoma cell lines with distinct ALK alterations, we investigated the role of ALK endocytosis in glucose uptake. ALK -amplified, but not ALK -mutant, neuroblastoma cells exhibited a ~40-50% reduction in glucose uptake following inhibition of ALK or receptor endocytosis.

Why it matters for mitochondrial biology

Within mitochondrial research, this work maps primarily to redox biology, metabolism, cancer, genetics. It is relevant to mitochondrial dysfunction discourse because the abstract invokes functional impairment, cancer, systemic metabolic stress. That does not by itself establish a validated disease mechanism; it indicates thematic proximity. Because a therapeutic or interventional angle is present, the piece is of interest for mitochondrial-targeted drug hypothesis generation—subject to full-text validation of endpoints and safety context. Server: biorxiv. Posted 2026-08-05. Synthesis confidence is bounded by abstract completeness.

Study design (abstract-level)

Here, using neuroblastoma cell lines with distinct ALK alterations, we investigated the role of ALK endocytosis in glucose uptake.

Principal findings

1. We recently identified a noncanonical mechanism in which RTK-containing endocytic vesicles deliver extracellular glucose to hexokinases associated with the outer mitochondrial membrane, thereby promoting cellular glucose uptake.
2. Here, using neuroblastoma cell lines with distinct ALK alterations, we investigated the role of ALK endocytosis in glucose uptake.
3. ALK -amplified, but not ALK -mutant, neuroblastoma cells exhibited a ~40-50% reduction in glucose uptake following inhibition of ALK or receptor endocytosis.
4. Furthermore, disruption of the endocytic machinery selectively impaired the growth of ALK -amplified neuroblastoma cells.
5. These findings identify ALK endocytosis as a major regulator of glucose uptake in ALK -amplified neuroblastoma and suggest that RTK endocytosis represents a previously unrecognized metabolic vulnerability that may be therapeutically exploitable in RTK-driven cancers.

Limitations of this brief

• This Mitos brief is an abstract-level synthesis of a preprint; it is not peer review and not a substitute for reading the full paper.
• Preprint status: findings may change with revision or journal review.
• Effect sizes, n numbers, statistics, and full experimental controls are typically incomplete at abstract resolution.
• Comparator/control language is weak or absent in the abstract, limiting causal inference from this brief alone.
• Primary source: biorxiv DOI 10.64898/2026.08.04.742396 (posted 2026-08-05).

Open scientific questions

• Which specific experimental panels in the full paper establish the strongest causal claim, and how robust are the controls?
• What dose, timing, and off-target profile would be required to take the intervention seriously as a therapeutic hypothesis?
• How do these findings sit relative to prior literature on the same pathway—replication, contradiction, or incremental extension?

Bottom line

For mitochondrial biologists focused on redox biology, metabolism, cancer, this preprint is worth full-text review soon. Abstract-level takeaway: We recently identified a noncanonical mechanism in which RTK-containing endocytic vesicles deliver extracellular glucose to hexokinases associated with the outer mitochondrial membrane, thereby promoting cellular glucose uptake. Confirm methods, effect sizes, and controls in the full PDF before citing the result as established.

Bibliographic record

Abstract-based editorial synthesis by Mitos. Not peer review.