Parathyroid hormone-related protein expression in gynecic squamous carcinoma cells.

Abstract:

BACKGROUND:The regulation of parathyroid hormone-related protein (PTH-rP) mRNA levels and immunoreactive (ir)PTH-rP formation by peptide growth factors, particularly transforming growth factor-beta (TGF-beta) and epidermal growth factor (EGF), in squamous cell carcinomas of gynecologic origin is largely unknown. METHODS:PTH-rP mRNA levels were evaluated by Northern analysis in A431 cells (derived from a human vulvar epidermoid carcinoma) and ME-180 cells (derived from a human papillomavirus-infected squamous cell carcinoma of the cervix). PTH-rP protein levels in cell culture media were evaluated using both radioimmunoassay and immunoradiometric assay techniques. These results were compared with those from a lung carcinoid cell line known to produce PTH-rP, namely, NCI-H727 cells. RESULTS:TGF-beta 1 or EGF treatment caused an increase in the levels of PTH-rP mRNA in A431 cells; these increases in PTH-rP mRNA were detectable after 60 minutes of treatment, were maximal at approximately 4-8 hours, and were approximately additive. Immunoreactive PTH-rP was not detectable (using two different PTH-rP immunoassays) in the culture medium or cell sonicates of A431 cells before or after treatment with TGF-beta 1, EGF, or TGF-beta 1 plus EGF. ME-180 cells responded to EGF (but not to TGF-beta 1) with an increase in the level of PTH-rP mRNA as early as 2 hours; irPTH-rP was present (by use of either immunoassay) in the medium of these cells at 8 and 24 hours. In NCI-H727 (human lung carcinoid) cells, TGF-beta 1 and EGF acted alone and synergistically to effect increases in PTH-rP mRNA and the accumulation of irPTH-rP. CONCLUSIONS:TGF-beta 1 and EGF regulation of PTH-rP gene expression in squamous cell carcinomas of gynecologic origin is unique for each cell line studied and different from that in human lung carcinoid cells.

journal_name

Cancer

journal_title

Cancer

authors

Tait DL,MacDonald PC,Casey ML

doi

10.1002/1097-0142(19940301)73:5<1515::aid-cncr2820

subject

Has Abstract

pub_date

1994-03-01 00:00:00

pages

1515-21

issue

5

eissn

0008-543X

issn

1097-0142

journal_volume

73

pub_type

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