Efficacy of native and hyperglycosylated follicle-stimulating hormone analogs for promoting fertility in female mice.
Fertil Steril 2008;
91:265-70. [PMID:
18249396 DOI:
10.1016/j.fertnstert.2007.11.013]
[Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2007] [Revised: 11/08/2007] [Accepted: 11/08/2007] [Indexed: 11/28/2022]
Abstract
OBJECTIVE
To compare the efficacy of recombinant human FSH (rhFSH) with rhFSH with four additional O-linked carbohydrates (rhFSH-CTP), rhFSH with four additional N-linked carbohydrates (rhFSH-N4), and the current gold standard for rodent ovarian stimulation, pregnant mare serum gonadotropin (PMSG), on fertility parameters in mice.
DESIGN
Animal study.
SETTING
Academic research center.
ANIMAL(S)
Adult C57Bl/6J female mice.
INTERVENTION(S)
Ovarian stimulation with 5 IU of rhFSH, rhFSH-CTP, rhFSH-N4, or PMSG. Forty-six hours later, 5 IU of hCG was injected to promote ovulation and females were mated overnight.
MAIN OUTCOME MEASURE(S)
Eggs retrieved after ovulation, in vitro embryo development, delivery rate, and litter size.
RESULT(S)
The hyperglycosylated FSH analogs, rhFSH-CTP and rhFSH-N4, enhanced ovulation and embryo maturation significantly better than rhFSH. RhFSH-N4 produced more eggs (28.5 +/- 1.9 per mouse) and embryos (17.8 +/- 1.6) compared with rhFSH-CTP (18.3 +/- 1.2 and 9.0 +/- 1.0, respectively). Treatment with rhFSH, rhFSH-N4, and PMSG produced statistically equivalent delivery rates and litter sizes. The delivery rate was surprisingly lower with rhFSH-CTP (14%) compared with PMSG (33%).
CONCLUSION(S)
Compared with rhFSH, treatment with hyperglycosylated rhFSH-CTP and rhFSH-N4 led to superior rates of ovulated eggs and subsequent in vitro embryo development. RhFSH-N4 was equivalent to PMSG, while all of the fertility parameters studied were lower with rhFSH-CTP than with PMSG therapy.
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