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Spatial Multiomic Analyses Reveal Carcinogenic Pathways in End-Stage Renal Disease.

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Patients with end-stage renal disease (ESRD) face higher risks of acquired cystic kidney disease (ACKD) and kidney tumors. This study reveals inflammatory environments and MET pathway activation drive cyst formation and tumor development in ACKD.

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Area of Science:

  • Nephrology
  • Oncology
  • Molecular Biology

Background:

  • Patients with end-stage renal disease (ESRD) have an elevated risk of developing acquired cystic kidney disease (ACKD) and renal tumors.
  • The underlying molecular mechanisms driving ACKD and associated malignancies in ESRD patients are not well understood.

Purpose of the Study:

  • To investigate the molecular landscape and oncogenic mechanisms of renal tumors associated with ACKD in ESRD patients.
  • To elucidate the cellular origins and developmental pathways of renal cysts in ACKD.

Main Methods:

  • Spatial immunogenomic analyses were conducted on 268 specimens from 43 patients with ACKD and associated tumors.
  • Single-cell and spatial analyses were employed to examine the cellular and molecular characteristics of ACKD and tumors.

Main Results:

  • The molecular profile of ESRD-associated renal tumors differs significantly from sporadic renal cell carcinoma.
  • ACKD is characterized by an inflammatory microenvironment, with renal cysts originating from proximal tubular cells that survive inflammatory damage.
  • Renal cyst formation involves clonal expansion, and the MET tyrosine kinase pathway is activated by paracrine signaling, promoting cyst growth.

Conclusions:

  • The study identifies key oncogenic mechanisms driving tumor development in the context of ACKD in ESRD patients.
  • Understanding these pathways, particularly inflammation and MET signaling, offers potential therapeutic targets for improving patient prognosis.