REGULATION OF PARATHYROID HORMONE-RELATED PEPTIDE PRODUCTION INVITRO BY THE RAT HYPERCALCEMIC LEYDIG-CELL TUMOR H-500

被引:46
作者
LIU, B
GOLTZMAN, D
RABBANI, SA
机构
[1] ROYAL VICTORIA HOSP, CALCIUM RES LAB, ROOM H4 72, 687 PINE AVE W, MONTREAL H3A 1A1, QUEBEC, CANADA
[2] MCGILL UNIV, DEPT MED, MONTREAL H3A 2T5, QUEBEC, CANADA
[3] MCGILL UNIV, DEPT PHYSIOL, MONTREAL H3A 2T5, QUEBEC, CANADA
关键词
D O I
10.1210/en.132.4.1658
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
The transplantable rat Leydig cell tumor H-500 is known to cause hypercalcemia in vivo by the release of abundant PTH-related peptide (PTHRP) and to closely reproduce the human syndrome of malignancy-associated hypercalcemia. In the rat only a single messenger RNA species of 1.4 kilobases is expressed which encodes a peptide of 141 amino acid as the sole molecular form. We have examined in cultured rat Leydig tumor cells H-500, the capacity of multiple factors to regulate PTHRP messenger RNA expression and secretion. Both fetal bovine serum and epidermal growth factor stimulated PTHRP gene expression and secretion into conditioned culture medium. Dexamethasone and 1,25-dihydroxyvitamin D3 produced inhibition of PTHRP gene expression and secretion. Furthermore, in these testicular cells, after 12 h or more of incubation, testosterone produced a dose-dependent (10(-9)-10(-7) M) inhibition of PTHRP production. No significant difference in this inhibitory response was seen between testosterone and its 5alpha-reduced metabolite dihydrotestosterone whereas 17beta-estradiol, progesterone, LH, FSH, and PRL were ineffective. An androgen receptor antagonist Win 49596 blocked the androgen-mediated inhibition of PTHRP gene expression and secretion, but not that due to dexamethasone. Epidermal growth factor caused an increase, whereas androgen caused a decrease in PTHRP gene transcription. These studies demonstrated that growth factors, dexamethasone, and 1,25-dihydroxyvitamin D3 are broadly active regulatory agents of PTHRP production which cross species and tissue barriers. Testosterone may be a more selective modulator which can regulate PTHRP in tissues such as Leydig cell neoplasms which express the androgen receptor.
引用
收藏
页码:1658 / 1664
页数:7
相关论文
共 40 条
  • [21] PARATHYROID HORMONE-RELATED PROTEIN PURIFIED FROM A HUMAN-LUNG CANCER CELL-LINE
    MOSELEY, JM
    KUBOTA, M
    DIEFENBACHJAGGER, H
    WETTENHALL, REH
    KEMP, BE
    SUVA, LJ
    RODDA, CP
    EBELING, PR
    HUDSON, PJ
    ZAJAC, JD
    MARTIN, TJ
    [J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1987, 84 (14) : 5048 - 5052
  • [22] NISSENSON RA, 1988, J BIOL CHEM, V263, P12866
  • [23] PURIFICATION OF PEPTIDES WITH PARATHYROID HORMONE-LIKE BIOACTIVITY FROM HUMAN AND RAT MALIGNANCIES ASSOCIATED WITH HYPERCALCEMIA
    RABBANI, SA
    MITCHELL, J
    ROY, DR
    KREMER, R
    BENNETT, HPJ
    GOLTZMAN, D
    [J]. ENDOCRINOLOGY, 1986, 118 (03) : 1200 - 1210
  • [24] RABBANI SA, 1988, ENDOCRINOLOGY, V123, P2709
  • [25] RIZZOLI R, 1989, J BONE MINER RES, V4, P839
  • [26] PRODUCTION OF PARATHYROID HORMONE-LIKE PEPTIDE IN A HUMAN OSTEO-SARCOMA CELL-LINE - STIMULATION BY PHORBOL ESTERS AND EPIDERMAL GROWTH-FACTOR
    RODAN, SB
    WESOLOWSKI, G
    IANACONE, J
    THIEDE, MA
    RODAN, GA
    [J]. JOURNAL OF ENDOCRINOLOGY, 1989, 122 (01) : 219 - +
  • [27] IMMUNOHISTOCHEMICAL LOCALIZATION OF THE ANDROGEN RECEPTOR IN RAT AND HUMAN TISSUES
    SAR, M
    LUBAHN, DB
    FRENCH, FS
    WILSON, EM
    [J]. ENDOCRINOLOGY, 1990, 127 (06) : 3180 - 3186
  • [28] SCHERMER DT, 1991, J BONE MINER RES, V6, P149
  • [29] SELVANAYAGAM P, 1991, LAB INVEST, V64, P713
  • [30] THE HYPERCALCEMIC RAT LEYDIG-CELL TUMOR - A MODEL OF THE HUMORAL HYPERCALCEMIA OF MALIGNANCY
    SICA, DA
    MARTODAM, RR
    ARONOW, J
    MUNDY, GR
    [J]. CALCIFIED TISSUE INTERNATIONAL, 1983, 35 (03) : 287 - 293