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. 1991 Oct 1;88(19):8327–8331. doi: 10.1073/pnas.88.19.8327

Expression of biologically active heterodimeric bovine follicle-stimulating hormone in milk of transgenic mice.

N M Greenberg 1, J W Anderson 1, A J Hsueh 1, K Nishimori 1, J J Reeves 1, D M deAvila 1, D N Ward 1, J M Rosen 1
PMCID: PMC52501  PMID: 1924292

Abstract

Follicle-stimulating hormone (FSH; follitropin) is a pituitary glycoprotein composed of two post-translationally modified subunits, which must properly assemble to be biologically active. FSH has been difficult to purify and to obtain in quantities sufficient for detailed biochemical studies. We have targeted FSH expression to the mammary gland of transgenic mice by using cDNAs encoding the bovine alpha and FSH beta subunits and a modified rat beta-casein gene-based expression system. Lines of bigenic mice expressing both subunits have been generated either by coinjection of the subunit transgenes or by mating mice that acquired and expressed transgenes encoding an individual subunit. Up to 60 international units (15 micrograms) of biologically active FSH per ml was detected in the milk of the bigenic mice. These lines provide a model system for studying the post-transcriptional mechanisms that effect the expression and secretion of this heterodimeric hormone.

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