Focused research review
Orphan receptor cannabinoid targets: what the research says
What evidence connects cannabinoids or endocannabinoids with GPR55, GPR18, and GPR119?
The short answer
What is the bottom line?
Research has examined Orphan receptor cannabinoid targets. This page brings together 4 research reviews and 1 lab, animal, or mechanism source. Most of the current evidence is preclinical or focused on biological mechanisms. The studies do not all test the same product, dose, group of people, or outcome, so they cannot be reduced to one answer for every person or product. 1
Key takeaways
What to know first
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Research on Orphan receptor cannabinoid targets covers Receptors and pharmacology; those areas should not be combined into one claim. 1
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Most of the current evidence is preclinical or focused on biological mechanisms. 2
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Dose, formulation, route, study population, and outcome can change how closely a study applies to a real-world question. 3
Research areas
What researchers studied about Orphan receptor cannabinoid targets
These are the main questions represented in the current literature. Each link opens a source used to build the overview.
Too limited for a firm answer
Receptors and pharmacology
This part of the literature focuses on Receptors and pharmacology. Studies may use different compounds, formulations, doses, routes, groups of people, and outcomes, so the details of each source matter. 2
How strong is the research?
Not every study answers the same question
This page separates research in people, research reviews, and earlier-stage biology before interpreting the larger question.
Human studies
Research involving people is closest to everyday health questions. The product, dose, population, and outcome still determine what each study can show.
Reviews and evidence summaries
Reviews can compare several studies at once. Their conclusion is only as strong and as relevant as the studies they include.
Lab, animal, and mechanism research
Early-stage research can explain biological interest. It cannot, by itself, show that the same effect happens in people.
What these studies actually looked at
The research on Orphan receptor cannabinoid targets is not one kind of study. This source set includes 4 narrative or expert reviews and 1 animal study. 3
The recorded populations or models include people or patients (2 sources) and animal models (1 source). A result from one group or model should not be assumed to apply to another. 4
The most common recorded outcome focus is receptor, target, or pharmacology mechanisms (5 sources). Closely related outcome names can still describe different measurements. 5
The Orphan receptor cannabinoid targets source set also contains findings or reviews that remain too limited, indirect, or mixed for a broad answer. That uncertainty is part of the result, not an empty space to fill with assumptions. 1
Examples from the literature
What did the studies actually look at?
Each example names the research question and the study details recorded for that source.
narrative or expert review
Cannabinoid Receptor-Related Orphan G Protein-Coupled Receptors.
On this page, this source examines Cannabinoids activity involving receptor, target, or pharmacology mechanisms. 1
- Study type
- narrative or expert review
- Population or model
- people or patients
- Outcome focus
- receptor, target, or pharmacology mechanisms
- Evidence stage
- evidence still limited
narrative or expert review
Potential metabolic and behavioural roles of the putative endocannabinoid receptors GPR18, GPR55 and GPR119 in feeding.
On this page, this source examines Endocannabinoids activity involving receptor, target, or pharmacology mechanisms. 2
- Study type
- narrative or expert review
- Population or model
- people or patients
- Outcome focus
- receptor, target, or pharmacology mechanisms
- Evidence stage
- evidence still limited
animal study
Δ9-Tetrahydrocannabinol and Cannabidiol Differentially Regulate Intraocular Pressure.
On this page, this source examines THC activity involving receptor, target, or pharmacology mechanisms. 3
- Study type
- animal study
- Population or model
- animal models
- Outcome focus
- receptor, target, or pharmacology mechanisms
- Evidence stage
- preclinical research
narrative or expert review
New Insights in Cannabinoid Receptor Structure and Signaling.
On this page, this source examines Cannabinoids activity involving receptor, target, or pharmacology mechanisms. 4
- Study type
- narrative or expert review
- Outcome focus
- receptor, target, or pharmacology mechanisms
- Evidence stage
- evidence still limited
narrative or expert review
Some Prospective Alternatives for Treating Pain: The Endocannabinoid System and Its Putative Receptors GPR18 and GPR55.
On this page, this source examines Endocannabinoids activity involving receptor, target, or pharmacology mechanisms. 5
- Study type
- narrative or expert review
- Outcome focus
- receptor, target, or pharmacology mechanisms
- Evidence stage
- evidence still limited
Safety and limits
What should readers keep in mind?
Research on Orphan receptor cannabinoid targets should be read beside safety. A compound can be non-intoxicating or naturally occurring and still have pharmacologic effects, side effects, interactions, or product-quality concerns. 2
Research doses are descriptions of what a study tested. They are not personal dosing instructions. Questions involving medications, pregnancy, children, driving, liver health, heart health, or serious symptoms deserve professional medical guidance.
Common questions
Questions people ask
What evidence connects cannabinoids or endocannabinoids with GPR55, GPR18, and GPR119?
Relevant research is collected here. Most of the current evidence is preclinical or focused on biological mechanisms. 2
Why is there not always a yes-or-no answer?
The sources may test different products, doses, people, and outcomes, so a single conclusion can hide important differences. 3
Where can I read the original studies?
Use the numbered citations and the source list at the bottom of the page to open PubMed or DOI records. 4
Sources
Read the research
The numbered sources below support the main overview. Links open the PubMed record or DOI in a new tab.
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1
Cannabinoid Receptor-Related Orphan G Protein-Coupled Receptors. narrative or expert review; evidence still limited PubMed 28826536 DOI 10.1016/bs.apha.2017.04.004
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2
Potential metabolic and behavioural roles of the putative endocannabinoid receptors GPR18, GPR55 and GPR119 in feeding. narrative or expert review; evidence still limited PubMed 31146657 DOI 10.2174/1570159x17666190118143014
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3
Δ9-Tetrahydrocannabinol and Cannabidiol Differentially Regulate Intraocular Pressure. animal study; preclinical research PubMed 30550613 DOI 10.1167/iovs.18-24838
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4
New Insights in Cannabinoid Receptor Structure and Signaling. narrative or expert review; evidence still limited PubMed 30767756 DOI 10.2174/1874467212666190215112036
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5
Some Prospective Alternatives for Treating Pain: The Endocannabinoid System and Its Putative Receptors GPR18 and GPR55. narrative or expert review; evidence still limited PubMed 30670965 DOI 10.3389/fphar.2018.01496
See all 5 research sources
This complete source list is the deeper research layer for the page. Study type and evidence context are shown when they are available in the current record.
- Potential metabolic and behavioural roles of the putative endocannabinoid receptors GPR18, GPR55 and GPR119 in feeding. narrative or expert review; evidence still limited / 1 linked research note PubMed 31146657
- Some Prospective Alternatives for Treating Pain: The Endocannabinoid System and Its Putative Receptors GPR18 and GPR55. narrative or expert review; evidence still limited / 1 linked research note PubMed 30670965
- Cannabinoid Receptor-Related Orphan G Protein-Coupled Receptors. narrative or expert review; evidence still limited / 1 linked research note PubMed 28826536
- New Insights in Cannabinoid Receptor Structure and Signaling. narrative or expert review; evidence still limited / 1 linked research note PubMed 30767756
- Δ9-Tetrahydrocannabinol and Cannabidiol Differentially Regulate Intraocular Pressure. animal study; preclinical research / 1 linked research note PubMed 30550613