Genistein Stimulates Jejunum Chloride Secretion via an Akt-Mediated Pathway in Intact Female Mice
Background/Aims: We have previously shown that daily subcutaneous injections with the naturally occurring phytoestrogen genistein (600 mg genistein/kg body weight/day, 600G) results in a significantly increased basal intestinal chloride, Cl-, secretion (Isc, a measure of transepithelial secretion) i...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Cell Physiol Biochem Press GmbH & Co KG
2015-02-01
|
| Series: | Cellular Physiology and Biochemistry |
| Subjects: | |
| Online Access: | http://www.karger.com/Article/FullText/373953 |
| _version_ | 1818598259313082368 |
|---|---|
| author | Lana Leung Ashesh Bhakta Katherine Cotangco Layla Al-Nakkash |
| author_facet | Lana Leung Ashesh Bhakta Katherine Cotangco Layla Al-Nakkash |
| author_sort | Lana Leung |
| collection | DOAJ |
| description | Background/Aims: We have previously shown that daily subcutaneous injections with the naturally occurring phytoestrogen genistein (600 mg genistein/kg body weight/day, 600G) results in a significantly increased basal intestinal chloride, Cl-, secretion (Isc, a measure of transepithelial secretion) in intact C57BL/6J female mice after 1-week of treatment, compared to controls (DMSO vehicle injected). Removal of endogenous estrogen via ovariectomy (OVX) had no effect on the 600G-mediated increase in basal Isc. Methods: Given the estrogen-like characteristics of genistein, we compared the effects of daily estradiol (E2) injections (10 mg E2/kg body weight/day, 10E2) on basal Isc in intact and OVX mice. In intact mice, 10E2 was without effect on basal Isc, however, in OVX mice, 10E2 significantly increased basal Isc (mimicked 600G). The goal of the current study was to characterize the intracellular signaling pathways responsible for mediating 600G- or 10E2-stimulated increases in basal Isc in intact female or OVX mice. Results: We measured total protein expression in isolated segments of jejunum using western blot from the following six groups of mice; intact or OVX with; 600G, 10E2 or control. The proteins of interest were: Akt, p-Akt, p-PDK1, p-PTEN, p-c-Raf, p-GSK-3β, rap-1 and ERK1/2. All blots were normalized to GAPDH levels (n = 6-18/group). Conclusion: These data suggest that the presence of the endogenous sex steroid, estrogen, modifies the intracellular signaling pathway required to mediate Cl- secretion when the intestine is exposed to exogenous 600G or E2. These studies may have relevance for designing pharmacological tools for women with intestinal chloride secretory dysfunctions. |
| first_indexed | 2024-12-16T12:00:51Z |
| format | Article |
| id | doaj.art-1eed82f3cdd148eca196a64682b43455 |
| institution | Directory Open Access Journal |
| issn | 1015-8987 1421-9778 |
| language | English |
| last_indexed | 2024-12-16T12:00:51Z |
| publishDate | 2015-02-01 |
| publisher | Cell Physiol Biochem Press GmbH & Co KG |
| record_format | Article |
| series | Cellular Physiology and Biochemistry |
| spelling | doaj.art-1eed82f3cdd148eca196a64682b434552022-12-21T22:32:27ZengCell Physiol Biochem Press GmbH & Co KGCellular Physiology and Biochemistry1015-89871421-97782015-02-013541317132510.1159/000373953373953Genistein Stimulates Jejunum Chloride Secretion via an Akt-Mediated Pathway in Intact Female MiceLana LeungAshesh BhaktaKatherine CotangcoLayla Al-NakkashBackground/Aims: We have previously shown that daily subcutaneous injections with the naturally occurring phytoestrogen genistein (600 mg genistein/kg body weight/day, 600G) results in a significantly increased basal intestinal chloride, Cl-, secretion (Isc, a measure of transepithelial secretion) in intact C57BL/6J female mice after 1-week of treatment, compared to controls (DMSO vehicle injected). Removal of endogenous estrogen via ovariectomy (OVX) had no effect on the 600G-mediated increase in basal Isc. Methods: Given the estrogen-like characteristics of genistein, we compared the effects of daily estradiol (E2) injections (10 mg E2/kg body weight/day, 10E2) on basal Isc in intact and OVX mice. In intact mice, 10E2 was without effect on basal Isc, however, in OVX mice, 10E2 significantly increased basal Isc (mimicked 600G). The goal of the current study was to characterize the intracellular signaling pathways responsible for mediating 600G- or 10E2-stimulated increases in basal Isc in intact female or OVX mice. Results: We measured total protein expression in isolated segments of jejunum using western blot from the following six groups of mice; intact or OVX with; 600G, 10E2 or control. The proteins of interest were: Akt, p-Akt, p-PDK1, p-PTEN, p-c-Raf, p-GSK-3β, rap-1 and ERK1/2. All blots were normalized to GAPDH levels (n = 6-18/group). Conclusion: These data suggest that the presence of the endogenous sex steroid, estrogen, modifies the intracellular signaling pathway required to mediate Cl- secretion when the intestine is exposed to exogenous 600G or E2. These studies may have relevance for designing pharmacological tools for women with intestinal chloride secretory dysfunctions.http://www.karger.com/Article/FullText/373953GenisteinEstradiolChloride secretionJejunumIntestineSignaling pathwaysIntact miceOvariectomized mice |
| spellingShingle | Lana Leung Ashesh Bhakta Katherine Cotangco Layla Al-Nakkash Genistein Stimulates Jejunum Chloride Secretion via an Akt-Mediated Pathway in Intact Female Mice Cellular Physiology and Biochemistry Genistein Estradiol Chloride secretion Jejunum Intestine Signaling pathways Intact mice Ovariectomized mice |
| title | Genistein Stimulates Jejunum Chloride Secretion via an Akt-Mediated Pathway in Intact Female Mice |
| title_full | Genistein Stimulates Jejunum Chloride Secretion via an Akt-Mediated Pathway in Intact Female Mice |
| title_fullStr | Genistein Stimulates Jejunum Chloride Secretion via an Akt-Mediated Pathway in Intact Female Mice |
| title_full_unstemmed | Genistein Stimulates Jejunum Chloride Secretion via an Akt-Mediated Pathway in Intact Female Mice |
| title_short | Genistein Stimulates Jejunum Chloride Secretion via an Akt-Mediated Pathway in Intact Female Mice |
| title_sort | genistein stimulates jejunum chloride secretion via an akt mediated pathway in intact female mice |
| topic | Genistein Estradiol Chloride secretion Jejunum Intestine Signaling pathways Intact mice Ovariectomized mice |
| url | http://www.karger.com/Article/FullText/373953 |
| work_keys_str_mv | AT lanaleung genisteinstimulatesjejunumchloridesecretionviaanaktmediatedpathwayinintactfemalemice AT asheshbhakta genisteinstimulatesjejunumchloridesecretionviaanaktmediatedpathwayinintactfemalemice AT katherinecotangco genisteinstimulatesjejunumchloridesecretionviaanaktmediatedpathwayinintactfemalemice AT laylaalnakkash genisteinstimulatesjejunumchloridesecretionviaanaktmediatedpathwayinintactfemalemice |