Summary of GHRL
GHRL is the gene that codes for the peptide hormone, ghrelin. Ghrelin is considered a multi-functional hormone that is mainly produced by specialized stomach cells (R). It is also produced by various tissues and organs including the gut, pancreas, kidney, reproductive organs, placenta, bone, and brain (R, R2, R3).
Injections of Ghrelin in both humans and mice have been shown to increase food intake in a dose-dependent manner: the more Ghrelin, the more you eat (R, R2). Chronically elevated levels of ghrelin are associated with obesity, overeating, and inflammation-related diseases including Ulcerative Colitis, Crohns Disease, Pancreatitis, and possibly Rheumatoid Arthritis (R).
The Function of GHRL
Obestatin may be the ligand for GPR39. May have an appetite-reducing effect resulting in decreased food intake. May reduce gastric emptying activity and jejunal motility.
Protein names
Recommended name:
Appetite-regulating hormoneAlternative name(s):
Growth hormone secretagogueGrowth hormone-releasing peptide
Motilin-related peptide
Protein M46
Ghrelin
- RS34911341 (GHRL) ??
- RS35683 (GHRL) ??
- RS42451 (GHRL) ??
- RS4684677 (GHRL) ??
- RS696217 (GHRL) ??
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Top Gene-Substance Interactions
GHRL Interacts with These Diseases
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Fixes
Ways to Increase Ghrelin
If you have low levels of ghrelin and are genetically predisposed to autoimmunity, you might want to increase ghrelin production.
- Weight Loss - Ghrelin is lower in overweight people (R, R2).
- Fasting - Ghrelin is secreted when the stomach is empty (R).
- Fiber - Under fasting conditions, the more fiber consumed, the higher ghrelin levels (R).
- Curcumin (R) -in diabetic animal models with gastroparesis.
- Fish Oil (R)
- Hi-maize Resistant Starch (R)
- Zinc - In young pigs (R).
Ways to Reduce Ghrelin
If you have high levels of ghrelin, are genetically predisposed to cancer or eating disorders, or are trying to lose weight, you might want to decrease ghrelin production. Here are some habitual ways to decrease ghrelin:
- Protein (Red meat) - (R, R2) Ghrelin levels after eating a high protein meal was much lower compared to ghrelin levels after a high a calorie meal.
- Adequate sleep - (R).
- Fructose Restriction - (R) Ghrelin does not decrease as much after eating fructose. Lingering ghrelin may lead to overeating and contribute to weight gain and obesity.
- Vitamin D3 (maybe) - Ghrelin was higher in people who were deficient in vitamin D3 (R).
- Using Honey instead of sugar (maybe) (R).
Fixes Advanced
Additional Ways to Increase Ghrelin
- Hydrogen water (R, R2).
- Sleep deprivation - Even one night of sleep deprivation led to increased ghrelin levels in healthy volunteers (R).
- Chronic stress increases ghrelin and appetite (R).
- Adenosine has many of the effects of ghrelin by activating the growth hormone secretagogue receptor (R).
Additional Ways to Reduce Ghrelin
Substances That Increase GHRL
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Substances That Decrease GHRL
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Advanced Summary
From NCBI Gene: Obesity
From NCBI Gene: This gene encodes the ghrelin-obestatin preproprotein that is cleaved to yield two peptides, ghrelin and obestatin. Ghrelin is a powerful appetite stimulant and plays an important role in energy homeostasis. Its secretion is initiated when the stomach is empty, whereupon it binds to the growth hormone secretagogue receptor in the hypothalamus which results in the secretion of growth hormone (somatotropin). Ghrelin is thought to regulate multiple activities, including hunger, reward perception via the mesolimbic pathway, gastric acid secretion, gastrointestinal motility, and pancreatic glucose-stimulated insulin secretion. It was initially proposed that obestatin plays an opposing role to ghrelin by promoting satiety and thus decreasing food intake, but this action is still debated. Recent reports suggest multiple metabolic roles for obestatin, including regulating adipocyte function and glucose metabolism. Alternative splicing results in multiple transcript variants. In addition, antisense transcripts for this gene have been identified and may potentially regulate ghrelin-obestatin preproprotein expression. [provided by RefSeq, Nov 2014] From UniProt: Ghrelin is the ligand for growth hormone secretagogue receptor type 1 (GHSR). Induces the release of growth hormone from the pituitary. Has an appetite-stimulating effect, induces adiposity and stimulates gastric acid secretion. Involved in growth regulation. Obestatin may be the ligand for GPR39. May have an appetite-reducing effect resulting in decreased food intake. May reduce gastric emptying activity and jejunal motility.
Conditions with Increased Gene Activity
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Conditions with Decreased Gene Activity
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Technical
The following transcription factors affect gene expression:
Tissue specificity:
Highest level in stomach. All forms are found in serum as well. Other tissues compensate for the loss of ghrelin synthesis in the stomach following gastrectomy.
Molecular Function:
- G-Protein Coupled Receptor Binding
- Growth Hormone-Releasing Hormone Activity
- Protein Tyrosine Kinase Activator Activity
- Ghrelin Receptor Binding
Biological Processes:
- Activation Of Mapk Activity
- Gastric Acid Secretion
- Negative Regulation Of Endothelial Cell Proliferation
- Glucose Metabolic Process
- G-Protein Coupled Receptor Signaling Pathway
- Positive Regulation Of Cytosolic Calcium Ion Concentration
- Actin Polymerization Or Depolymerization
- Adult Feeding Behavior
- Response To Hormone
- Hormone-Mediated Signaling Pathway
- Dendrite Development
- Negative Regulation Of Angiogenesis
- Growth Hormone Secretion
- Positive Regulation Of Insulin Secretion
- Regulation Of Response To Food
- Positive Regulation Of Appetite
- Negative Regulation Of Interleukin-1 Beta Production
- Negative Regulation Of Locomotion
- Positive Regulation Of Multicellular Organism Growth
- Regulation Of Cell Proliferation
- Negative Regulation Of Circadian Sleep/Wake Cycle, Rem Sleep
- Negative Regulation Of Tumor Necrosis Factor Biosynthetic Process
- Negative Regulation Of Apoptotic Process
- Cortisol Secretion
- Response To Estrogen
- Negative Regulation Of Interleukin-6 Biosynthetic Process
- Positive Regulation Of Circadian Sleep/Wake Cycle, Non-Rem Sleep
- Negative Regulation Of Insulin Secretion
- Decidualization
- Negative Regulation Of Inflammatory Response
- Cartilage Development
- Positive Regulation Of Corticotropin Secretion
- Positive Regulation Of Cortisol Secretion
- Positive Regulation Of Synapse Assembly
- Excitatory Postsynaptic Potential
- Positive Regulation Of Growth Hormone Secretion
- Positive Regulation Of Growth Hormone Receptor Signaling Pathway
- Negative Regulation Of Energy Homeostasis
- Positive Regulation Of Energy Homeostasis