Antioxidant procyanidin B2 protects oocytes against cryoinjuries via mitochondria regulated cortical tension

Abstract

Background Irreversible cryodamage caused by oocyte vitrification limited its wild application in female fertility preservation. Antioxidants were always used to antagonist the oxidative stress caused by vitrification. However, the comprehensive mechanism underlying the protective role of antioxidants has not been studied. Procyanidin B2 (PCB2) is a potent natural antioxidant and its functions in response to vitrification are still unknown. In this study, the effects of PCB2 on vitrified-thawed oocytes and subsequent embryo development were explored, and the mechanisms underlying the protective role of PCB2 were systematically elucidated. Results Vitrification induced a marked decline in oocyte quality, while PCB2 could improve oocyte viability and further development after parthenogenetic activation. A subsequent study indicated that PCB2 effectively attenuated vitrification-induced oxidative stress, rescued mitochondrial dysfunction, and improved cell viability. Moreover, PCB2 also acts as a cortical tension regulator apart from strong antioxidant properties. Increased cortical tension caused by PCB2 would maintain normal spindle morphology and promote migration, ensure correct meiosis progression and finally reduce the aneuploidy rate in vitrified oocytes. Further study reveals that ATP biosynthesis plays a crucial role in cortical tension regulation, and PCB2 effectively increased the cortical tension through the electron transfer chain pathway. Additionally, PCB2 would elevate the cortical tension in embryo cells at morula and blastocyst stages and further improve blastocyst quality. What’s more, targeted metabolomics shows that PCB2 has a beneficial effect on blastocyst formation by mediating saccharides and amino acids metabolism. Conclusions Antioxidant PCB2 exhibits multi-protective roles in response to vitrification stimuli through mitochondria-mediated cortical tension regulation.

Mass Spectrometry-Imaging Analysis of Active Ingredients in the Leaves of Taxus cuspidata

“…Procyanidin B2 is a potent natural antioxidant exhibiting multiprotective roles in response to vitrification stimuli. 43 In T. cuspidata , Procyanidin B2 was detected in vascular bundle cells and mesophyll cells. Additionally, bisdemethoxycurcumin and dimethylfraxetin were also significantly accumulated in the vascular system of T. cuspidata leaves ( Figure 5 ).…”

“…cuspidata, isocolumbin and gartanin are two vascular bundle cell specifically accumulated active compounds (>90%), suggesting their movement between plant tissues. Procyanidin B2 is a potent natural antioxidant exhibiting multiprotective roles in response to vitrification stimuli . In T.…”

Mito-TEMPO Improves the Meiosis Resumption and Mitochondrial Function of Vitrified Sheep Oocytes via the Recovery of Respiratory Chain Activity

“…Therefore, we investigated the calcium levels in oocytes. A previous study showed that Rhod 2-AM and Fluo 4-AM could accurately track mitochondria Ca 2+ ([Ca 2+ ] m ) and endoplasmic reticulum Ca 2+ ([Ca 2+ ] ER ) in oocytes, respectively [ 27 ]. We also utilized Fluo 3-AM to analyze the cytoplasmic calcium ([Ca 2+ ] c ) concentration.…”

Superior performance of biocomposite nanoparticles PLGA-RES in protecting oocytes against vitrification stimuli

“…GSH acts as a natural antioxidant inside cells to inhibit oxidative stress ( Adeoye et al, 2018 ). Many studies have reported that ROS, GSH and MMP were indicators of oxidative stress on oocytes ( Zhuan et al, 2022 ; Bai et al, 2023 ; Sun et al, 2023 ). To further evaluate the effect of PLGA-RES on oxidative stress, ROS, GSH and MMP levels were measured, and the results indicated that PLGA-RES dramatically reduce oxidative status in in vitro matured oocytes.…”