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J Turk Ger Gynecol Assoc. 2017 Sep 01;18(3):102-109. doi: 10.4274/jtgga.2017.0014.

Liposome-encapsulated diacyl glycerol and inositol triphosphate-induced delayed oocyte activation and poor development of parthenotes.

Journal of the Turkish German Gynecological Association

Ramya Nair, Jyothsna Manikkath, Aswathi R Hegde, Srinivas Mutalik, Guruprasad Kalthur, Satish Kumar Adiga

Affiliations

  1. Department of Clinical Embryology, Central Research Lab, Kasturba Medical College, Manipal University, Manipal, India.
  2. Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal University, Manipal, India.

PMID: 28890423 PMCID: PMC5590204 DOI: 10.4274/jtgga.2017.0014

Abstract

OBJECTIVE: To explore the ability of diacyl glycerol (DAG) and inositol triphosphate (IP3), two major secondary messengers in the calcium signaling pathway, in activating oocytes.

MATERIAL AND METHODS: Oocyte cumulus complex obtained from superovulated Swiss albino mice were incubated in M16 medium with liposome-encapsulated 1,2-Dipalmitoyl-sn-glycerol (LEDAG) and/or IP3 for 3 h. Strontium chloride was used as positive control. The activation potential, ploidy status, and blastocyst rate was calculated.

RESULTS: Both DAG and IP3, individually, induced activation in ~98% of oocytes, which was significantly higher (p<0.01) than activation induced by strontium chloride (60%). Delayed pronucleus formation and a higher percentage of diploid parthenotes was observed in oocytes activated with LEDAG and/or IP3. However, these embryos failed to progress beyond the 6-8-cell stage. Only when the medium was supplemented with LEDAG (5 μg/mL) and IP3 (10 μg/mL) could activated oocytes progress till the blastocyst stage (5.26%), which was lower than the blastocyst rate in the positive controls (13.91%).

CONCLUSION: The results of the present study indicate that DAG and IP3 can induce delayed oocyte activation and poor development of parthenotes in vitro.

Keywords: Oocyte activation; diacyl glycerol; inositol triphosphate; liposomes embryo development.

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