Product Name: Leptin Rat

Product No: CYT-227

Synonym(s): Leptin Rat Recombinant, OB Protein, Obesity Protein, OBS, Obesity factor.

One-Letter-Code: The sequence of the first five N-terminal amino acids was determined and was found to be Ala-Val-Pro-Ile-His.

Description: Leptin Rat Recombinant produced in E.Coli is a single, non-glycosylated, polypeptide chain containing 147 amino acids and having a molecular mass of 16 kDa.The Leptin is purified by proprietary chromatographic techniques.

Protein Derived From: Escherichia Coli.

Physical Appearance: Sterile Filtered White lyophilized (freeze-dried) powder.

Purity: Greater than 95.0% as determined by:(a) Analysis by SEC-HPLC.(b) Analysis by SDS-PAGE.

Stability: Lyophilized Leptin although stable at room temperature for 3 weeks, should be stored desiccated below -18°C. Upon reconstitution Leptin should be stored at 4°C between 2-7 days and for future use below -18°C.For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA).Please prevent freeze-thaw cycles.

Biological Activity: Biological activity of Leptin Rat is evidenced by inducing proliferation of BAF/3 cells stably transfected with the long form of human leptin receptor.

Solubility: It is recommended to reconstitute the lyophilized Leptin in sterile 18MOmega-cm H2O not less than 100µg/ml, which can then be further diluted to other aqueous solutions.

Protein content: Protein quantitation was carried out by two independent methods:1. UV spectroscopy at 280 nm using the absorbency value of 0.201 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics).2. Analysis by RP-HPLC, using a calibrated solution of Leptin rat as a Reference Standard.

References: 1.Title:Expression of Hypothalamic KiSS-1 System and Rescue of Defective Responses by Kisspeptin in Streptozotocin-Induced Diabetic Male Rats.Publication: doi: 10.2337/db05-1584DiabetesSeptember 2006 vol. 55 no. 9 2602-2610Link:;55/9/26022.Title:Desensitization of responses to kisspeptin in the female rat: analyses of LH and FSH secretion at different developmental and metabolic states.Publication:Am J Physiol Endocrinol Metab 294: E1088–E1096, 2008.294: E1088–E1096, 2008. First published April 15, 2008; doi:10.1152/ajpendo.90240.2008.Link: MAPK and LXR?mediate leptin effect on SREBP-1c expression in hepatic stellate cells(short title: Leptin effect on SREBP-1c expression).Publication:Link: by leptin in a rat model of permanent cerebral ischemia: effects on STAT3 phosphorylation in discrete cells of the brain.Publication:Citation:Cell Death and Disease(2011)2, e238; doi:10.1038/cddis.2011.125Published online 8 December 2011.Link: 5.Title:The mammalian target of rapamycin as novel central regulator of puberty onset via modulation of hypothalamic Kiss1 system.Publication:Endocrinology150.11 (2009): 5016-5026.Link

Special Note(s): ProSpec's products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.