ELISA/assay

Human Leptin ELISA Kit

MBS8506134

1 x48 Wells

295 USD

ELISA Kit

Human Leptin ELISA Kit

Leptin

leptin; Leptin; leptin; obese protein; obesity factor; obese, mouse, homolog of; leptin (murine obesity homolog); leptin (obesity homolog, mouse); leptin; Obese protein; Obesity factor

LEP; LEP; OB; OBS; LEPD; OB; OBS

LEP_HUMAN

167

This assay recognizes both natural and recombinant human Leptin. The factors listed below were prepared at 50ng/ml in Standard /sample Diluent and assayed for cross-reactivity and no significant cross-reactivity or interference was observed.

Samples: Cell culture supernates, serum, and plasma. Assay Type: Sandwich. Sensitivity: The minimum detectable dose was 7pg/mL.

Immunology

Background/Introduction: Human Leptin (gene name OB) is a 16 kDa, 146 amino acid (aa) residue, non-glycosylated polypeptide that regulates adipose tissue mass and energy balance (1 - 6). Mature human Leptin shares 87% and 84% aa identity with mouse and rat Leptin, respectively(1,7). Human Leptin is active in both the mouse and rat systems (8, 9). Leptin is expressed almost exclusively by adipocytes and its production is influenced by hormones, cytokines and nutrients (5, 7, 10) and circulates in the plasma, crosses the blood-brain barrier, and is present in human breast milk (3 - 6, 11). The human Leptin receptor (designated ObR or LEPR) is a 150 kDa, 1144 aa residue, type I transmembrane glycoprotein of the IL-6 receptor family of Class I cytokine receptors (12, 13). The gene for ObR undergoes considerable splicing, forming variants a-d with cytoplasmic domains of variable length, plus the potentially soluble form ObRe (13, 14). The long form, ObRb (formerly OB RL), is expressed mainly in the hypothalamic arcuate nucleus and is essential for signal transduction (6, 15, 16). In a concentration-dependent manner, Leptin signaling can have diverse effects, causing neurons that express pro-opiomelanocortin (POMC) peptides to reduce food intake, and neurons that express neuropeptide Y and agouti-related protein (NpY and AgRP) to increase food intake (4, 6). Leptin is fundamentally a "starvation signal" that, when low, prompts increased appetite and decreased energy expenditure (4, 6, 10). Leptin deficiency influences the immune system, depressing Th1 responses and causing increased frequency of infections (4). Leptin also regulates puberty, blocking the onset of puberty, or of menses if Leptin deficiency exists due to excessive thinness, such as results from starvation, extreme exercise-induced weight loss, anorexia or cancer-induced cachexia (3, 4). Principle of the Assay: This assay employs the quantitative sandwich enzyme immunoassay technique. A monoclonal antibody specific for Leptin has been pre-coated onto a microplate. Standards and samples are pipetted into the wells and any Leptin present is bound by the immobilized antibody. Following incubation unbound samples are removed during a wash step, and then a detection antibody specific for Leptin is added to the wells and binds to the combination of capture antibody- Leptin in sample. Following a wash to remove any unbound combination, and enzyme conjugate is added to the wells. Following incubation and wash steps a substrate is added. A coloured product is formed in proportion to the amount of Leptin present in the sample. The reaction is terminated by addition of acid and absorbance is measured at 450nm. A standard curve is prepared from seven Leptin standard dilutions and Leptin sample concentration determined.

4557715

NP_000221.1

NM_000230.2

18,641 Da

AMPK Signaling Pathway (198868); AMPK Signaling Pathway (989139); AMPK Signaling Pathway (992181); Adipocytokine Signaling Pathway (83093); Adipocytokine Signaling Pathway (505); Adipogenesis Pathway (198832); Cytokine-cytokine Receptor Interaction Pathway (83051); Cytokine-cytokine Receptor Interaction Pathway (460); Developmental Biology Pathway (477129); HIF-1-alpha Transcription Factor Network Pathway (138045)

This gene encodes a protein that is secreted by white adipocytes, and which plays a major role in the regulation of body weight. This protein, which acts through the leptin receptor, functions as part of a signaling pathway that can inhibit food intake and/or regulate energy expenditure to maintain constancy of the adipose mass. This protein also has several endocrine functions, and is involved in the regulation of immune and inflammatory responses, hematopoiesis, angiogenesis and wound healing. Mutations in this gene and/or its regulatory regions cause severe obesity, and morbid obesity with hypogonadism. This gene has also been linked to type 2 diabetes mellitus development. [provided by RefSeq, Jul 2008]

leptin: May function as part of a signaling pathway that acts to regulate the size of the body fat depot. An increase in the level of LEP may act directly or indirectly on the CNS to inhibit food intake and/or regulate energy expenditure as part of a homeostatic mechanism to maintain constancy of the adipose mass. Defects in LEP may be a cause of obesity (OBESITY). It is a condition characterized by an increase of body weight beyond the limitation of skeletal and physical requirements, as the result of excessive accumulation of body fat. Belongs to the leptin family. Protein type: Secreted; Secreted, signal peptide; Cell development/differentiation; Hormone. Chromosomal Location of Human Ortholog: 7q31.3. Cellular Component: extracellular space; cytoplasm; extracellular region. Molecular Function: peptide hormone receptor binding; growth factor activity; hormone activity. Biological Process: circadian rhythm; response to dietary excess; positive regulation of myeloid cell differentiation; regulation of fat cell differentiation; regulation of steroid biosynthetic process; negative regulation of transcription from RNA polymerase II promoter; female pregnancy; glucose homeostasis; negative regulation of appetite; positive regulation of luteinizing hormone secretion; response to insulin stimulus; positive regulation of tyrosine phosphorylation of Stat3 protein; response to vitamin E; regulation of cholesterol absorption; positive regulation of MAPKKK cascade; regulation of blood pressure; positive regulation of cell proliferation; positive regulation of ion transport; central nervous system neuron development; placenta development; positive regulation of cytokine production; cholesterol metabolic process; positive regulation of developmental growth; eating behavior; bile acid metabolic process; glucose metabolic process; adult feeding behavior; ovulation from ovarian follicle; leptin-mediated signaling pathway; negative regulation of vasoconstriction; tyrosine phosphorylation of STAT protein; fatty acid beta-oxidation; glycerol biosynthetic process; insulin secretion; energy reserve metabolic process; response to hypoxia; hormone metabolic process; regulation of gluconeogenesis; positive regulation of insulin receptor signaling pathway; positive regulation of follicle-stimulating hormone secretion; leukocyte tethering or rolling; regulation of insulin secretion; negative regulation of apoptosis. Disease: Leptin Deficiency

1 x48 Wells

295 USD

1x96 Wells

355