Bcakground

Prolactin (gene name PRL) is a secreted neuroendocrine pituitary hormone that acts primarily on the mammary gland to promote lactation, but has pleiotropic effects in both males and females (1-6). Prolactin is predominantly found as 199 amino acid, 25 kDa glycosylated and 23 kDa non-glycosylated monomers (6). Human prolactin shares only 60% and 63% amino acid sequence identity with mouse and rat prolactin, respectively, although rat prolactin can activate the human prolactin receptor (3). Post-translational modifications such as polymerization, complex formation with IgG (in humans), glycosy-lation, and proteolytic cleavage can alter the activities of prolactin (6-8). Non-glycosylated prolactin is produced by the pituitary and packaged in storage granules before secretion, while glycosylated prolactin is reported to be constitutively secreted, have lower biological potency, and be removed from the circulation more quickly (3, 6, 7). Cleavage by matrix metalloproteinases or Cathepsin D can produce N-terminal 16 kDa antiangiogenic fragments also called vasoinhibins (9, 10). Thrombin can produce C-terminal 16 kDa fragments that are not antiangiogenic (3). Prolactin is synthesized mainly by the anterior pituitary in all mammals, where secretion is under tonic inhibition by hypothalamic dopamine (2, 3). In humans, prolactin is also produced peripherally (2-5). Prolactin expression is low during early human pregnancy, but increases in late pregnancy (2, 3). The prolactin receptor (gene name PRLR) is a transmembrane type I glycoprotein that belongs to the cytokine hematopoietic receptor family. Expression of the prolactin receptor is widespread (2-5).

Reference

1. Cooke, N.E. et al. (1981) J. Biol. Chem. 256:4007.

2. Grattan, D.R. and I.C. Kokay (2008) J. Neuroendocrinol. 20:752.

3. Ben-Jonathan, N. et al. (2008) Endocr. Rev. 29:1.

4. Bernichtein, S. et al. (2010) J. Endocrinol. 206:1.

5. Goffin, V. et al. (2011) Nat. Rev. Urology 8:597.

6. Price, A.E. et al. (1995) Endoc. 136:4827.

7. Hoffmann, T. et al. (1993) J. Endoc. Invest. 16:807.

8. Cole, E. et al. (1991) Endoc. 129:2639.

9. Piwnica, D. et al. (2006) Mol. Endocrinol. 20:3263.

10. Macotela, Y. et al. (2006) J. Cell Sci. 119:1790.

Specifications

Synonyms	PRL; Prolactin
Accession #	P01236
Source	Human embryonic kidney cell, HEK293-derived human Prolactin protein
Source	Leu29-Cys227
Predicted Moleucular weight	22.9 kDa
Form/Structure	Dimer in solution

Components and Storage

Formulation	Solution protein
	Dissolved in sterile PBS buffer
	This solution can be diluted into other aqueous buffers. Centrifuge the vial prior to opening.
Storage and Stability	Avoid repeated freeze-thaw cycles.
	It is recommended that the protein be aliquoted for optimal storage.
	12 months from date of receipt, -20 to -70 °C as supplied.
Shipping	Shipping with dry ice

Quality

Purity	> 95%, determined by SDS-PAGE.
Endotoxin Level	<0.010 EU per 1 ug of the protein by the LAL method.
Activity	Measured in a cell proliferation assay using Nb2-11 rat lymphoma cells
Activity	The EC50 for this effect is 5-14.8 pg/mL.

SDS-PAGE

Bioactivity

Documents

Human Prolactin