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Receptors for Luteinizing Hormone Releasing Hormone Expressed on Human Renal Cell Carcinomas Can Be Used for Targeted Chemotherapy with Cytotoxic Luteinizing Hormone Releasing Hormone Analogues

Authors' Affiliations: ¹ Endocrine, Polypeptide and Cancer Institute, Veterans Affairs Medical Center; ² Section of Experimental Medicine, Department of Medicine, Tulane University School of Medicine, New Orleans, Louisiana; ³ Supported by a fellowship within the post doctorate program of the German Academic Exchange Service; and ⁴ Department of Pathology and Biomedical Research, Klinikum Kassel, Germany

Requests for reprints: Andrew V. Schally, Veterans Affairs Medical Center, 1601 Perdido Street, New Orleans, LA 70112-1262. Phone: 504-589-5230; Fax: 504-566-1625; E-mail: aschally{at}tulane.edu.

Purpose: To determine the expression of luteinizing hormone releasing hormone (LHRH) receptors in specimens and cell lines of human renal cell carcinoma (RCC) and to evaluate the antitumor efficacy of targeted therapy with a cytotoxic analogue of LHRH, AN-207, in vivo. AN-207, consisting of [D-Lys⁶] LHRH linked to a cytotoxic radical, 2-pyrrolinodoxorubicin (AN-201), binds with high affinity to LHRH receptors and can be targeted to tumors expressing these receptors.

Experimental Design: The expression of LHRH receptors was investigated in 28 surgically removed specimens of human renal cell carcinoma (RCC) by immunohistochemistry and in three human RCC cell lines A-498, ACHN, and 786-0 by radioreceptor assays, Western immunoblotting, and reverse transcription-PCR analysis. Antitumor efficacy of AN-207 was examined in experimental models of these cell lines.

Results: Positive staining for LHRH receptors was found in all (28 of 28) of the examined human RCC specimens. mRNA for LHRH receptor, receptor protein, and LHRH binding sites were detected in all three cell lines. AN-207 significantly (P < 0.05) inhibited the growth of A-498, ACHN, and 786-0 xenografts in vivo producing a 67.8% to 73.8% decrease in tumor volume and a 62.2% to 77.3% reduction in tumor weight. Nontargeted cytotoxic radical AN-201 had no significant antitumor effects. Blockade of LHRH receptors by an excess of LHRH agonist Decapeptyl suppressed tumor inhibitory effects of AN-207.

Conclusions: Our findings indicate that LHRH receptors are expressed in human RCC specimens and can be used for targeted chemotherapy with cytotoxic LHRH analogues.

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