The Granulin-Epithelin Precursor Is a Steroid-Regulated Growth Factor in Endometrial Cancer

Monica Brown Jones, Aletta P. Houwink, Brandi K. Freeman, Tammy M. Greenwood, Jacqueline M. Lafky, Wilma L. Lingle, Andrew Berchuck, G. Lawrence Maxwell, Karl C. Podratz, Nita J. Maihle

Research output: Contribution to journalArticle

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Abstract

Objectives: The majority of endometrial cancers arise as a result of estrogen stimulation, the molecular targets of which remain incompletely defined. We hypothesize that the granulin-epithelin precursor (GEP) may be one such target. In this study, we examined the frequency of GEP and estrogen receptor (ER) co-expression in human endometrial cancers. Once we established the co-expression of GEP with the estrogen receptor we examined the potential estrogen regulation of GEP expression, as well as the functional significance of GEP expression in vitro. Methods: Double immunofluorescence and confocal microscopy were used to compare GEP and ER expression among 41 endometrial cancers. The effects of estradiol and tamoxifen treatment on GEP expression in two endometrial cancer cell lines, KLE and HEC-1-A, were assessed through reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blot analysis. The antiproliferative effect of GEP silencing by short hairpin (sh)RNA, was evaluated in HEC-1-A cells using an MTT assay. Results: GEP co-expression with ER was observed in 63% of the cancers examined. A two- to fivefold increase in GEP expression with estradiol and/or tamoxifen treatment was observed in KLE cells. Silencing of GEP in HEC-1-A cells using shRNA resulted in a decrease in proliferation among transfected cells. Conclusions: Co-expression of GEP and ER in endometrial cancer cells, and the regulation of GEP by estrogen, suggests a role for GEP in steroid-mediated endometrial cancer cell growth. Further characterization of GEP as a steroid-mediated growth factor in these cells may broaden our understanding of endometrial cancer biology and also provide guidance in the development of novel therapeutic targets.

Original languageEnglish (US)
Pages (from-to)304-311
Number of pages8
JournalJournal of the Society for Gynecologic Investigation
Volume13
Issue number4
DOIs
StatePublished - May 2006

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Endometrial Neoplasms
Intercellular Signaling Peptides and Proteins
Steroids
Estrogen Receptors
Estrogens
granulin precursor protein
Tamoxifen
Small Interfering RNA
Estradiol
Reverse Transcriptase Polymerase Chain Reaction
Fluorescence Microscopy
Confocal Microscopy

Keywords

  • Endometrial cancer
  • estrogen receptor
  • granulin-epithelin precursor
  • growth factors
  • hormone-regulated cancers
  • PC-derived growth factor
  • steroid hormones

ASJC Scopus subject areas

  • Obstetrics and Gynecology

Cite this

Jones, M. B., Houwink, A. P., Freeman, B. K., Greenwood, T. M., Lafky, J. M., Lingle, W. L., ... Maihle, N. J. (2006). The Granulin-Epithelin Precursor Is a Steroid-Regulated Growth Factor in Endometrial Cancer. Journal of the Society for Gynecologic Investigation, 13(4), 304-311. https://doi.org/10.1016/j.jsgi.2006.03.003

The Granulin-Epithelin Precursor Is a Steroid-Regulated Growth Factor in Endometrial Cancer. / Jones, Monica Brown; Houwink, Aletta P.; Freeman, Brandi K.; Greenwood, Tammy M.; Lafky, Jacqueline M.; Lingle, Wilma L.; Berchuck, Andrew; Maxwell, G. Lawrence; Podratz, Karl C.; Maihle, Nita J.

In: Journal of the Society for Gynecologic Investigation, Vol. 13, No. 4, 05.2006, p. 304-311.

Research output: Contribution to journalArticle

Jones, MB, Houwink, AP, Freeman, BK, Greenwood, TM, Lafky, JM, Lingle, WL, Berchuck, A, Maxwell, GL, Podratz, KC & Maihle, NJ 2006, 'The Granulin-Epithelin Precursor Is a Steroid-Regulated Growth Factor in Endometrial Cancer', Journal of the Society for Gynecologic Investigation, vol. 13, no. 4, pp. 304-311. https://doi.org/10.1016/j.jsgi.2006.03.003
Jones, Monica Brown ; Houwink, Aletta P. ; Freeman, Brandi K. ; Greenwood, Tammy M. ; Lafky, Jacqueline M. ; Lingle, Wilma L. ; Berchuck, Andrew ; Maxwell, G. Lawrence ; Podratz, Karl C. ; Maihle, Nita J. / The Granulin-Epithelin Precursor Is a Steroid-Regulated Growth Factor in Endometrial Cancer. In: Journal of the Society for Gynecologic Investigation. 2006 ; Vol. 13, No. 4. pp. 304-311.
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title = "The Granulin-Epithelin Precursor Is a Steroid-Regulated Growth Factor in Endometrial Cancer",
abstract = "Objectives: The majority of endometrial cancers arise as a result of estrogen stimulation, the molecular targets of which remain incompletely defined. We hypothesize that the granulin-epithelin precursor (GEP) may be one such target. In this study, we examined the frequency of GEP and estrogen receptor (ER) co-expression in human endometrial cancers. Once we established the co-expression of GEP with the estrogen receptor we examined the potential estrogen regulation of GEP expression, as well as the functional significance of GEP expression in vitro. Methods: Double immunofluorescence and confocal microscopy were used to compare GEP and ER expression among 41 endometrial cancers. The effects of estradiol and tamoxifen treatment on GEP expression in two endometrial cancer cell lines, KLE and HEC-1-A, were assessed through reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blot analysis. The antiproliferative effect of GEP silencing by short hairpin (sh)RNA, was evaluated in HEC-1-A cells using an MTT assay. Results: GEP co-expression with ER was observed in 63{\%} of the cancers examined. A two- to fivefold increase in GEP expression with estradiol and/or tamoxifen treatment was observed in KLE cells. Silencing of GEP in HEC-1-A cells using shRNA resulted in a decrease in proliferation among transfected cells. Conclusions: Co-expression of GEP and ER in endometrial cancer cells, and the regulation of GEP by estrogen, suggests a role for GEP in steroid-mediated endometrial cancer cell growth. Further characterization of GEP as a steroid-mediated growth factor in these cells may broaden our understanding of endometrial cancer biology and also provide guidance in the development of novel therapeutic targets.",
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AU - Greenwood, Tammy M.

AU - Lafky, Jacqueline M.

AU - Lingle, Wilma L.

AU - Berchuck, Andrew

AU - Maxwell, G. Lawrence

AU - Podratz, Karl C.

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N2 - Objectives: The majority of endometrial cancers arise as a result of estrogen stimulation, the molecular targets of which remain incompletely defined. We hypothesize that the granulin-epithelin precursor (GEP) may be one such target. In this study, we examined the frequency of GEP and estrogen receptor (ER) co-expression in human endometrial cancers. Once we established the co-expression of GEP with the estrogen receptor we examined the potential estrogen regulation of GEP expression, as well as the functional significance of GEP expression in vitro. Methods: Double immunofluorescence and confocal microscopy were used to compare GEP and ER expression among 41 endometrial cancers. The effects of estradiol and tamoxifen treatment on GEP expression in two endometrial cancer cell lines, KLE and HEC-1-A, were assessed through reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blot analysis. The antiproliferative effect of GEP silencing by short hairpin (sh)RNA, was evaluated in HEC-1-A cells using an MTT assay. Results: GEP co-expression with ER was observed in 63% of the cancers examined. A two- to fivefold increase in GEP expression with estradiol and/or tamoxifen treatment was observed in KLE cells. Silencing of GEP in HEC-1-A cells using shRNA resulted in a decrease in proliferation among transfected cells. Conclusions: Co-expression of GEP and ER in endometrial cancer cells, and the regulation of GEP by estrogen, suggests a role for GEP in steroid-mediated endometrial cancer cell growth. Further characterization of GEP as a steroid-mediated growth factor in these cells may broaden our understanding of endometrial cancer biology and also provide guidance in the development of novel therapeutic targets.

AB - Objectives: The majority of endometrial cancers arise as a result of estrogen stimulation, the molecular targets of which remain incompletely defined. We hypothesize that the granulin-epithelin precursor (GEP) may be one such target. In this study, we examined the frequency of GEP and estrogen receptor (ER) co-expression in human endometrial cancers. Once we established the co-expression of GEP with the estrogen receptor we examined the potential estrogen regulation of GEP expression, as well as the functional significance of GEP expression in vitro. Methods: Double immunofluorescence and confocal microscopy were used to compare GEP and ER expression among 41 endometrial cancers. The effects of estradiol and tamoxifen treatment on GEP expression in two endometrial cancer cell lines, KLE and HEC-1-A, were assessed through reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blot analysis. The antiproliferative effect of GEP silencing by short hairpin (sh)RNA, was evaluated in HEC-1-A cells using an MTT assay. Results: GEP co-expression with ER was observed in 63% of the cancers examined. A two- to fivefold increase in GEP expression with estradiol and/or tamoxifen treatment was observed in KLE cells. Silencing of GEP in HEC-1-A cells using shRNA resulted in a decrease in proliferation among transfected cells. Conclusions: Co-expression of GEP and ER in endometrial cancer cells, and the regulation of GEP by estrogen, suggests a role for GEP in steroid-mediated endometrial cancer cell growth. Further characterization of GEP as a steroid-mediated growth factor in these cells may broaden our understanding of endometrial cancer biology and also provide guidance in the development of novel therapeutic targets.

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