Evaluation of intracellular pH regulation and alkalosis defense mechanisms in preimplantation embryos
| Autor: | Senay Dagilgan, Ebru Dundar-Yenilmez, Abdullah Tuli, İbrahim Ferhat Ürünsak, Seref Erdogan |
|---|---|
| Přispěvatelé: | Çukurova Üniversitesi |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Anion exchanger activity
medicine.medical_specialty Alkalosis animal structures Mouse Intracellular pH Biology SLC4A Andrology 03 medical and health sciences chemistry.chemical_compound Mice 0302 clinical medicine Food Animals Chlorides Internal medicine medicine Animals Homeostasis Protein Isoforms Blastocyst Chloride-Bicarbonate Antiporters Small Animals reproductive and urinary physiology 030304 developmental biology Acidosis 0303 health sciences Mice Inbred BALB C 030219 obstetrics & reproductive medicine Zygote Equine Gene Expression Regulation Developmental Embryo Hydrogen-Ion Concentration medicine.disease Endocrinology medicine.anatomical_structure chemistry 13. Climate action DIDS embryonic structures Oviduct Animal Science and Zoology Female medicine.symptom |
| Popis: | PubMedID: 25572649 Intracellular pH (pHi) regulation is an important homeostatic function of cells. There are three major pHi-regulatory mechanisms: HCO3-/Cl- exchanger (anion exchanger [AE]), which alleviates alkalosis, and the Na+/H+ and Na+,HCO3-/Cl- exchangers, both of which alleviate acidosis. We hypothesized that there would be developmental changes in pHi-regulatory activity in preimplantation embryos as conditions in the oviduct are alkaline but acidic in the uterus. This study focused on the AE mechanism in pronuclear (PN) zygotes, two-cell (2-c), four-cell (4-c), morula, and blastocyst stage embryos from Balb/c mice. Microspectrofluorometry was used to monitor changes in pHi in embryos subjected to Cl--free media in presence or absence of an AE inhibitor, DIDS, and in embryos recovering from NH4Cl-induced alkalosis. Real-time polymerase chain reaction was used to identify AE isoforms. The pHi changes were greatest in PN zygotes (0.086±007 pHU/min) but fell as embryos developed to the 2-c, 4-c, morula, and blastocyst stages (0.063±006; 0.035±007; 0.024±004, and 0.014±004 pHU/min, respectively). DIDS significantly reduced the rise in pHi caused by Cl- removal in all embryos; the finding pointed out that this pHi changes are due to AE activity. But DIDS only inhibited the recovery responses of PN zygote, 2-c and 4-c embryos but not morula or blastocyst stage embryos. In bicarbonate-containing medium, all embryos recovered from induced alkalosis but only the morula and blastocyst stages could fully compensate from ammonium induced-alkalosis in bicarbonate-free medium. The finding showed that commonly used ammonium pulse method to investigate AE function against alkalosis is not suitable for morula and blastocyst embryonic stages. All embryos expressed SLC4A2 and SLC4A4 coding for AE-2 and AE-4, but none expressed either AE-1 or AE-3. The gradual change in the response to alkalosis in preimplantation embryos may be adaptations to their normal invivo environment, where the early embryos are located in the alkaline oviduct, whereas the morula and blastocyst move into the acidic uterus. © 2015 Elsevier Inc. Türkiye Bilimsel ve Teknolojik Araştirma Kurumu University Research Council, DePaul University: TF 2011-BAP-9 111S156 The authors thank Dr. Berrak C. Yegen for improving English of the article. This study was supported by Türkiye Bilimsel ve Teknolojik Araştirma Kurumu (TUBITAK) ( 111S156 ) and Çukurova University Research Council ( TF 2011-BAP-9 ). |
| Databáze: | OpenAIRE |
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