Effects of VHL deficiency on endolymphatic duct and sac

Sven Gläsker, Russell R. Lonser, Maxine G.B. Tran, Barbara Ikejiri, John A. Butman, Weifen Zeng, Patrick H. Maxwell, Zhengping Zhuang, Edward H. Oldfield, Alexander O. Vortmeyer

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

The von Hippel-Lindau (VHL) disease is caused by VHL germ line mutation. Inactivation of the wild-type copy of the VHL gene leads to up-regulation of hypoxic response and tumor formation within central nervous system (CNS), kidneys, pancreas, adrenal glands, epididymis, broad ligament, and the endolymphatic sac/petrous bone. Endolymphatic sac tumors (ELST) have been proposed to be derived from endolymphatic sac epithelium, but other possible structures of origin have been implicated. To clarify the anatomic and cellular origin of ELSTs, we did a morphologic and molecular pathologic analysis of 16 tumors. In addition, we investigated effects of VHL deficiency on "tumor-free" endolymphatic duct and sac of VHL patients. Several tumors included in this study were <1 cm in size, and their origin could be placed in the intraosseous portion of the endolymphatic duct/sac. Furthermore, by analysis of clinically uninvolved "tumor-free" endolymphatic duct and sac tissues of VHL patients, we discovered a variety of VHL-deficient microscopic abnormalities with morphologic similarities to ELSTs. We conclude that most, if not all, ELSTs arise within the intraosseous portion of the endolymphatic duct/sac, the vestibular aqueduct. In analogy to renal parenchyma and selected topographical sites within the CNS, endolymphatic duct/sac epithelia are preferentially and multifocally targeted in VHL disease. The primary effect of VHL deficiency on human endolymphatic duct/sac epithelium seems to be the generation of multifocal sites of VHL-deficient cell proliferations from which tumorigenesis may or may not occur. Therefore, inactivation of the VHL wild-type allele seems necessary but not sufficient for the formation of tumor.

Original languageEnglish (US)
Pages (from-to)10847-10853
Number of pages7
JournalCancer Research
Volume65
Issue number23
DOIs
StatePublished - Dec 1 2005
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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  • Cite this

    Gläsker, S., Lonser, R. R., Tran, M. G. B., Ikejiri, B., Butman, J. A., Zeng, W., Maxwell, P. H., Zhuang, Z., Oldfield, E. H., & Vortmeyer, A. O. (2005). Effects of VHL deficiency on endolymphatic duct and sac. Cancer Research, 65(23), 10847-10853. https://doi.org/10.1158/0008-5472.CAN-05-1104