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IGF1 stabilizes sperm membrane proteins to reduce cryoinjury and maintain post-thaw sperm motility in buffalo (Bubalus bubalis) spermatozoa. | LitMetric
Insulin like growth factor 1 (IGF1) in the seminal plasma is reported to improve sperm motility by reducing oxidative stress. The present study was conducted to assess the effect of addition of IGF1 on sperm function and protein composition during cryopreservation process. Semen samples were collected from six Murrah buffaloes (2 ejaculates from each animal) and diluted (80 million/ml) in tris egg yolk extender and divided into control, T1, T2 and T3, groups supplemented with 0, 50, 100 and 150 ng of IGF1/mL, respectively. The semen was filled in straws (250 μL) and straws from each group were divided into two batches. One batch was processed for freezing and another batch was incubated at 4 °C for 4 h. The sperm kinematic and functional parameters were studied in both the batches. A significant (P < 0.05) positive effect of IGF1 was observed on functional membrane integrity (%) during incubation at 4 °C for 4 h in T3 as compared to control group. The spermatozoa (%) positive for structural membrane integrity, mitochondrial membrane potential and the metabolic activity in post-thaw semen were significantly (P < 0.05) high in T3 than the control group. The acrosomal integrity was significantly (P < 0.05) higher in T2 group as compared to control. The proteins (kDa) of 17.3 with pI 4.2 (calmodulin), 11.3 with pI 6.5 (dermcidin) and 18.1 with pI 5.5 (sperm acrosome membrane associated protein3) were protected in IGF1 group. The study suggests that IGF1 can be added to the extender for improving cryosurvial of buffalo spermatozoa.
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