TY - JOUR
T1 - Antiproliferative effects of luteinizing hormone-releasing hormone (LHRH) agonists on human androgen-independent prostate cancer cell line DU 145
T2 - Evidence for an autocrine-inhibitory LHRH loop
AU - Dondi, Donatella
AU - Limonta, Patrizia
AU - Moretti, Roberta M.
AU - Marelli, Marina Montagnani
AU - Garattini, Enrico
AU - Motta, Marcella
PY - 1994/8/1
Y1 - 1994/8/1
N2 - The therapeutic options for the treatment of androgen-independent prostatic cancers are rather limited; this is mainly because our understanding of the local mechanisms involved in the control of androgen- independent proliferation of the tumor is still very poor. The present experiments have been performed to verify whether luteinizing hormone- releasing hormone (LHRH) agonists may possess a direct effect on the growth of the human androgen-independent prostate cancer cells DU 145 and whether a LHRH growth regulatory system may be present in these cells. The data have shown that two potent LHRH agonists (Zoladex and Buserelin) exert a significant and dose-dependent antiproliferative action on DU 145 cells, after 4 days of treatment. The inhibitory action of Zoladex and Buserelin is completely counteracted by the simultaneous treatment of the cells with a potent LHRH antagonist, suggesting that the action of the LHRH agonists may be mediated by specific receptors. This hypothesis has been confirmed by the demonstration that low-affinity binding sites for 125I-Buserelin are present on DU 145 cell membranes, particularly when cells are cultured in serum-free conditions. By using the reverse transcription-polymerase chain reaction technique, in the presence of a pair of specific oligonucleotide primers complementary to the human LHRH complementary DNA, it has been demonstrated that a mRNA for LHRH is expressed in DU 145 cells. Taken together, these data seem to indicate that an autocrine/paracrine LHRH (or LHRH-like) loop is present in androgen-independent prostate cancer cells, and may participate in the regulation of tumor cell growth. To verify this hypothesis, DU 145 cells have been cultured in serum-free conditions, and treated with a LHRH antagonist for 4 days. The treatment resulted in a significant increase of cell proliferation, suggesting an inhibitory role for the LHRH system in the local regulation of cell growth. In conclusion, these data demonstrate that: (a) LHRH agonists exert a specific antiproliferative action on the human androgen-independent DU 145 cells; (b) an autocrine/paracrine LHRH (or LHRH-like) loop, which seems to be inhibitory on cell proliferation, is expressed in DU 145 cells.
AB - The therapeutic options for the treatment of androgen-independent prostatic cancers are rather limited; this is mainly because our understanding of the local mechanisms involved in the control of androgen- independent proliferation of the tumor is still very poor. The present experiments have been performed to verify whether luteinizing hormone- releasing hormone (LHRH) agonists may possess a direct effect on the growth of the human androgen-independent prostate cancer cells DU 145 and whether a LHRH growth regulatory system may be present in these cells. The data have shown that two potent LHRH agonists (Zoladex and Buserelin) exert a significant and dose-dependent antiproliferative action on DU 145 cells, after 4 days of treatment. The inhibitory action of Zoladex and Buserelin is completely counteracted by the simultaneous treatment of the cells with a potent LHRH antagonist, suggesting that the action of the LHRH agonists may be mediated by specific receptors. This hypothesis has been confirmed by the demonstration that low-affinity binding sites for 125I-Buserelin are present on DU 145 cell membranes, particularly when cells are cultured in serum-free conditions. By using the reverse transcription-polymerase chain reaction technique, in the presence of a pair of specific oligonucleotide primers complementary to the human LHRH complementary DNA, it has been demonstrated that a mRNA for LHRH is expressed in DU 145 cells. Taken together, these data seem to indicate that an autocrine/paracrine LHRH (or LHRH-like) loop is present in androgen-independent prostate cancer cells, and may participate in the regulation of tumor cell growth. To verify this hypothesis, DU 145 cells have been cultured in serum-free conditions, and treated with a LHRH antagonist for 4 days. The treatment resulted in a significant increase of cell proliferation, suggesting an inhibitory role for the LHRH system in the local regulation of cell growth. In conclusion, these data demonstrate that: (a) LHRH agonists exert a specific antiproliferative action on the human androgen-independent DU 145 cells; (b) an autocrine/paracrine LHRH (or LHRH-like) loop, which seems to be inhibitory on cell proliferation, is expressed in DU 145 cells.
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M3 - Article
C2 - 8033142
AN - SCOPUS:0027941068
VL - 54
SP - 4091
EP - 4095
JO - Journal of Cancer Research
JF - Journal of Cancer Research
SN - 0008-5472
IS - 15
ER -