title: Properties of bisphosphonates in the 13762 rat mammary carcinoma model of tumor-induced bone resorption.
abstract: Bone metastasis from primary tumors is a clinically important complication of neoplastic progression. The role of parathyroid hormone-related protein (PTHrP) and transforming growth factor (TGF)-beta1 in this process has been clearly established. The current study describes an in vivo model of 13762 rat mammary carcinoma tumor cell-induced osteolysis in which PTHrP and TGF-beta1 expression is observed. Exposure of in vitro-cultured 13762 cells to doxorubicin, cis-platinum, carboplatin, methotrexate, 5-fluorouracil, paclitaxel, alendronate, risedronate, or pamidronate for 72 h resulted in varying effects on cell proliferation (IC(50) values of 0.005, 0.4, 1.9, >40, 17.9, 0.003, >40, >40, and 33.6 micro M, respectively). Tumor cells were implanted into the intramedullary space of the proximal tibia of rats, and the time course of tumor progression was evaluated using radiographic and microcomputed tomography scanning techniques. Trabecular bone mineral density, cortical bone mineral density, and whole bone mineral density were measured (in mg/cm(3)). In untreated animals, radiographic evidence of osteolysis was evident 7 days after implantation. Trabecular bone mineral density and whole bone mineral density were significantly decreased by 21 days after implantation (48% and 26%, respectively). Bisphosphonates showed broad protective activity against tumor-driven osteolysis, Immunohistochemical evaluation of s.c. and intratibially implanted cells demonstrated the expression of PTHrP and TGF-beta1. The results of this study demonstrate the ability of 13762 rat mammary carcinoma cells to elicit a measurable osteolysis and that bisphosphonates inhibit the tumor-induced bone resorption in this model.
authors.affiliation: Lilly Research Laboratories, Indianapolis, Indiana. St. Vincent's Institute of Medical Research, Melbourne, Fitzroy, Australia. EAlvarez@Curagen.com
authors.forename: Enrique
authors.initials: E
authors.lastname: Alvarez
authors.forename: Michael
authors.initials: M
authors.lastname: Westmore
authors.forename: Rachelle J Sells
authors.initials: RJ
authors.lastname: Galvin
authors.forename: Crystal L
authors.initials: CL
authors.lastname: Clapp
authors.forename: Eileen L
authors.initials: EL
authors.lastname: Considine
authors.forename: Shawn J
authors.initials: SJ
authors.lastname: Smith
authors.forename: Kristan
authors.initials: K
authors.lastname: Keyes
authors.forename: Philip W
authors.initials: PW
authors.lastname: Iversen
authors.forename: Dawn M
authors.initials: DM
authors.lastname: Delafuente
authors.forename: Shola
authors.initials: S
authors.lastname: Sulaimon
authors.forename: Carmen
authors.initials: C
authors.lastname: Zambrano
authors.forename: Linda
authors.initials: L
authors.lastname: Ma
authors.forename: Masahiko
authors.initials: M
authors.lastname: Sato
authors.forename: T John
authors.initials: TJ
authors.lastname: Martin
authors.forename: Beverly A
authors.initials: BA
authors.lastname: Teicher
authors.forename: Elizabeth J
authors.initials: EJ
authors.lastname: Galbreath
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000633:toxicity; D001862:Bone Resorption / Q000209:etiology / Q000517:prevention & control*; D002455:Cell Division / Q000187:drug effects; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D004164:Diphosphonates / Q000627:therapeutic use*; D018450:Disease Progression; D005260:Female; D006801:Humans; D008325:Mammary Neoplasms, Experimental / Q000150:complications / Q000188:drug therapy*; D009362:Neoplasm Metastasis; D010014:Osteolysis / Q000209:etiology / Q000517:prevention & control; D044162:Parathyroid Hormone-Related Protein / Q000032:analysis / Q000235:genetics; D051381:Rats; D011916:Rats, Inbred F344; D016212:Transforming Growth Factor beta / Q000032:analysis / Q000235:genetics
chemical_list: D000970:Antineoplastic Agents; D004164:Diphosphonates; D044162:Parathyroid Hormone-Related Protein; D016212:Transforming Growth Factor beta