Expression of gastrin releasing peptide receptor in renal cell carcinomas: A potential function for the regulation of neoangiogenesis and microvascular perfusion

M. Heuser, T. Schlott, Andrew V Schally, E. Kahler, R. Schliephake, S. O. Laabs, B. Hemmerlein

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Purpose: Gastrin releasing peptide (GRP) is a growth factor for renal cell carcinoma (RCC) and it has vasoactive properties. Blockade of GRP receptor inhibits the growth of GRP receptor positive and negative tumors in nude mice, suggesting GRP effects other than those related to tumor epithelium. Therefore, in this study we analyzed the effects of GRP receptor blockade on neoangiogenesis in RCC. Materials and Methods: GRP receptor expression was determined in human RCC and corresponding normal tissue by real-time reverse transcriptase-polymerase chain reaction, immunohistochemistry and confocal laser scanning microscopy. Multicellular spheroids of the A498 RCC line were implanted into dorsal skin fold chambers of athymic nude mice. Neoangiogenesis was measured by intravital microscopy after blockade of GRP receptors by the GRP antagonist RC-3095. The influence of GRP on vascular endothelial growth factor secretion in A498 cells was studied in vitro. Results: GRP receptor expression was immunolocalized in tumor cells and microvessels. Implanted tumor cell spheroids and spheroid microvessels of the chamber also expressed GRP receptors. Spheroid neoangiogenesis was significantly inhibited by RC-3095 when given immediately after spheroid implantation. Vascular endothelial growth factor secretion of A498 cells was not affected by GRP. Conclusions: RCC angiogenesis is sensitive to GRP receptor blockade. Therefore, GRP receptors may not only stimulate tumor cell proliferation, but also affect tumor microcirculation.

Original languageEnglish
Pages (from-to)2154-2159
Number of pages6
JournalJournal of Urology
Volume173
Issue number6
DOIs
StatePublished - Jun 1 2005
Externally publishedYes

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Bombesin Receptors
Renal Cell Carcinoma
Gastrin-Releasing Peptide
Perfusion
Nude Mice
Neoplasms
Microvessels
Vascular Endothelial Growth Factor A
Cellular Spheroids
Microcirculation
Reverse Transcriptase Polymerase Chain Reaction
Confocal Microscopy
Real-Time Polymerase Chain Reaction
Intercellular Signaling Peptides and Proteins
Epithelium
Immunohistochemistry
Cell Proliferation

Keywords

  • Carcinoma, renal cell
  • Growth substances
  • Kidney
  • Microcirculation
  • Neovascularization, pathologic

ASJC Scopus subject areas

  • Urology

Cite this

Expression of gastrin releasing peptide receptor in renal cell carcinomas : A potential function for the regulation of neoangiogenesis and microvascular perfusion. / Heuser, M.; Schlott, T.; Schally, Andrew V; Kahler, E.; Schliephake, R.; Laabs, S. O.; Hemmerlein, B.

In: Journal of Urology, Vol. 173, No. 6, 01.06.2005, p. 2154-2159.

Research output: Contribution to journalArticle

Heuser, M. ; Schlott, T. ; Schally, Andrew V ; Kahler, E. ; Schliephake, R. ; Laabs, S. O. ; Hemmerlein, B. / Expression of gastrin releasing peptide receptor in renal cell carcinomas : A potential function for the regulation of neoangiogenesis and microvascular perfusion. In: Journal of Urology. 2005 ; Vol. 173, No. 6. pp. 2154-2159.
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AU - Heuser, M.

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AU - Schally, Andrew V

AU - Kahler, E.

AU - Schliephake, R.

AU - Laabs, S. O.

AU - Hemmerlein, B.

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