GO:0042701 progesterone secretion: Luteal Hormone Release, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0042701 progesterone secretion is defined as the regulated release of progesterone, a steroid hormone, by the corpus luteum of the ovary and by the placenta.
• Progesterone secretion is the terminal output of the luteal phase of the menstrual cycle and is essential for endometrial receptivity and early pregnancy maintenance.
• The corpus luteum is the dominant source of progesterone in the non-pregnant cycle, while the placenta becomes the major source after the luteal-placental shift in pregnancy.
• Progesterone acts through nuclear progesterone receptors and membrane progesterone receptors, which can mediate rapid non-genomic signaling such as glycogenolysis in uterine epithelium.
• Luteal phase insufficiency, defined by inadequate progesterone secretion, is a recognized cause of infertility and early pregnancy loss.
• Measuring progesterone secretion in serum or saliva is a standard approach for assessing luteal function and ovulation.
Description
GO:0042701 progesterone secretion is a biological process term that describes the regulated release of progesterone, a steroid hormone, by the corpus luteum of the ovary and by the placenta. Progesterone is a key steroid hormone that prepares and maintains the endometrium for implantation and supports the maintenance of pregnancy. The process is therefore central to reproductive physiology and to the clinical assessment of ovarian function. In the non-pregnant menstrual cycle, progesterone secretion rises after ovulation and peaks during the luteal phase, when the corpus luteum forms from the ruptured follicle. If pregnancy occurs, progesterone secretion is initially sustained by the corpus luteum and later shifts to the placenta. This luteal-placental shift is a critical endocrine transition that supports continued gestation. For researchers, GO:0042701 provides a precise ontology label for experiments that measure, perturb, or model the release of progesterone from ovarian and placental tissues. Because progesterone secretion is regulated by luteal cell function and can be assessed in serum or saliva, it is a tractable endpoint for genetic, pharmacological, and reproductive biology studies.
progesterone secretion At A Glance
| GO ID | GO:0042701 |
|---|---|
| GO term | progesterone secretion |
| Ontology | biological_process |
| Synonym | none |
| Definition | The regulated release of progesterone, a steroid hormone, by the corpus luteum of the ovary and by the placenta. |
| Major function | Regulated release of progesterone from the corpus luteum and placenta to support reproductive physiology. |
| Primary tissues | Corpus luteum of the ovary and placenta. |
| Physiological context | Luteal phase of the menstrual cycle and pregnancy maintenance. |
| Clinical relevance | Luteal phase insufficiency and infertility. |
| Measurement | Serum and salivary progesterone concentrations. |
What Is GO:0042701?
GO:0042701 progesterone secretion is the regulated release of progesterone, a steroid hormone, by the corpus luteum of the ovary and by the placenta. In other words, it is the process by which specialized endocrine cells export progesterone into the circulation, rather than the intracellular synthesis of the hormone itself. The term captures the secretory step that makes progesterone available as a systemic signal for target tissues such as the endometrium.
Why Is progesterone secretion Important in Cell Biology?
Progesterone secretion is important because it is the endocrine output that defines the luteal phase and supports early pregnancy. When progesterone secretion is inadequate, luteal phase insufficiency can contribute to infertility and early pregnancy loss. Because progesterone can be measured in serum and saliva, the process also provides a practical biomarker for ovulation and luteal function in clinical and research settings. Understanding the regulation of progesterone secretion is therefore relevant to reproductive medicine, contraception, and pregnancy maintenance.
• Defines the luteal phase of the menstrual cycle and the timing of endometrial receptivity.
• Supports maintenance of early pregnancy before the luteal-placental shift.
• Luteal phase insufficiency, reflecting inadequate progesterone secretion, is linked to infertility and early pregnancy loss.
• Provides a measurable endocrine endpoint in serum and saliva for assessing ovulation and luteal function.
• Relevant to contraceptive development and hormonal therapies that target progesterone action.
• Membrane progesterone receptors can mediate rapid non-genomic effects of progesterone in target tissues.
• Placental progesterone secretion becomes the dominant source later in pregnancy.
• Progesterone secretion is a key readout for studies of corpus luteum function and luteal cell biology.
What Happens During progesterone secretion?
Ovulation and corpus luteum formation
In simple terms: After an egg is released, the leftover follicle turns into a temporary gland called the corpus luteum.
Progesterone secretion begins after ovulation, when the ruptured ovarian follicle transforms into the corpus luteum. The corpus luteum is the principal source of progesterone during the luteal phase of the menstrual cycle. This transition is a prerequisite for the regulated release of progesterone that defines GO:0042701.
Luteal progesterone secretion
In simple terms: The corpus luteum releases progesterone into the blood to prepare the uterus for a possible pregnancy.
During the luteal phase, the corpus luteum secretes progesterone, which acts on the endometrium to support implantation. Luteal phase insufficiency occurs when this secretion is inadequate, and it is recognized as a cause of infertility and early pregnancy loss. Serum and salivary progesterone measurements are used to assess this secretory activity.
Luteal-placental shift
In simple terms: If pregnancy occurs, the placenta eventually takes over progesterone production from the ovary.
In early pregnancy, progesterone secretion is initially maintained by the corpus luteum, but later the placenta becomes the major source of progesterone. This luteal-placental shift is a key endocrine transition that supports continued gestation. The placenta is explicitly included in the GO:0042701 definition as a site of progesterone secretion.
Progesterone action on target tissues
In simple terms: Once released, progesterone travels through the blood and signals to tissues like the uterus.
Secreted progesterone acts on target tissues through nuclear progesterone receptors and membrane progesterone receptors. Membrane progesterone receptors can mediate rapid, non-genomic effects, such as progesterone-stimulated glycogenolysis in the bovine uterine epithelium. These downstream actions illustrate why the regulated release of progesterone is physiologically meaningful.
Measurement of progesterone secretion
In simple terms: Doctors and researchers can estimate progesterone secretion by measuring progesterone in blood or saliva.
Progesterone secretion can be assessed by measuring progesterone concentrations in serum or saliva, and sero-salivary correlation has been documented. Such measurements are used to evaluate luteal function and ovulation in clinical and research contexts. These readouts provide a practical way to study the process described by GO:0042701.
Key Genes Involved in GO:0042701 progesterone secretion
The following genes and proteins are relevant to progesterone secretion and its downstream actions, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PGR | Nuclear progesterone receptor mediating genomic progesterone effects | Target for studying progesterone action in endometrium and reproductive tissues |
| PAQR7 | Membrane progesterone receptor family member | Mediates rapid non-genomic progesterone signaling |
| PAQR8 | Membrane progesterone receptor family member | Candidate mediator of non-genomic progesterone effects |
| PAQR5 | Membrane progesterone receptor family member | Candidate mediator of non-genomic progesterone effects |
| STAR | Steroidogenic acute regulatory protein involved in steroidogenesis | Relevant to progesterone synthesis and secretion in luteal cells |
| CYP11A1 | Cholesterol side-chain cleavage enzyme in steroidogenesis | Relevant to progesterone production in corpus luteum and placenta |
| HSD3B1 | 3-beta-hydroxysteroid dehydrogenase involved in progesterone synthesis | Relevant to luteal progesterone production |
| HSD3B2 | 3-beta-hydroxysteroid dehydrogenase involved in progesterone synthesis | Relevant to luteal and placental progesterone production |
| CYP17A1 | Steroidogenic enzyme in ovarian steroidogenesis | Relevant to ovarian steroid hormone production |
| LHCGR | Luteinizing hormone receptor on luteal cells | Supports corpus luteum function and progesterone secretion |
| CGA | Glycoprotein hormone alpha subunit shared by LH and hCG | Relevant to gonadotropin support of luteal function |
| CGB | hCG beta subunit | Supports corpus luteum maintenance in early pregnancy |
| GNRHR | Gonadotropin-releasing hormone receptor | Upstream regulator of gonadotropin secretion and luteal function |
| PRLR | Prolactin receptor | Relevant to lactational and reproductive endocrine regulation |
| POMC | Pro-opiomelanocortin precursor of peptide hormones | Relevant to neuroendocrine regulation of reproduction |
| ESR1 | Estrogen receptor alpha | Relevant to ovarian and endometrial steroid signaling |
| ESR2 | Estrogen receptor beta | Relevant to ovarian and endometrial steroid signaling |
How Is progesterone secretion Regulated?
Progesterone secretion is regulated by the hypothalamic-pituitary-ovarian axis and by the corpus luteum itself. Gonadotropins, particularly luteinizing hormone, support corpus luteum function and luteal progesterone production. In early pregnancy, human chorionic gonadotropin helps maintain the corpus luteum until the placenta assumes progesterone secretion. Lactational and reproductive endocrine signals also influence ovarian function. Membrane progesterone receptors can mediate rapid effects of progesterone in target tissues, adding a non-genomic layer of regulation.
progesterone secretion and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PGR | Progesterone action in endometrium and reproductive tissues | Knockout or point-mutation cell model in endometrial cells |
| PAQR7 | Non-genomic progesterone signaling | Overexpression or knockout model in uterine epithelial cells |
| PAQR8 | Non-genomic progesterone signaling | Knockout model to test rapid progesterone effects |
| LHCGR | Luteal function and progesterone secretion | Knock-in or knockout model in luteal cell lines |
| HSD3B1 | Luteal progesterone production | Point-mutation model to study steroidogenic enzyme function |
Luteal phase insufficiency and infertility
Luteal phase insufficiency is a clinical condition in which progesterone secretion is inadequate, and it has been recognized as a cause of infertility and early pregnancy loss. Because progesterone secretion is required for endometrial support, defects in this process can impair implantation and pregnancy maintenance. Assessment of progesterone secretion through serum or salivary measurements is used in the evaluation of luteal function.
Early pregnancy loss and luteal-placental transition
Progesterone secretion must be maintained through the luteal-placental shift for pregnancy to continue. Disruption of this transition or inadequate luteal progesterone secretion can compromise early pregnancy. The placenta becomes the major source of progesterone later in pregnancy, and failure of this shift is clinically significant.
Contraception and hormonal regulation
Because progesterone secretion and action are central to reproductive physiology, hormonal contraceptives can target these pathways. Injectable contraception is one approach that modulates reproductive endocrine function. Understanding progesterone secretion is therefore relevant to contraceptive development and reproductive medicine.
From progesterone secretion-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does a candidate gene regulate progesterone secretion? | Knockout cell model in luteal or granulosa-derived cells |
| Does a specific variant alter progesterone secretion? | Point-mutation knock-in cell model |
| Can a reporter track progesterone secretion dynamics? | Tagged knock-in reporter cell line |
| Does overexpression of a receptor enhance progesterone signaling? | Overexpression cell model |
| Which genes are required for luteal cell function? | CRISPR library screening in luteal cell models |
| How does progesterone secretion correlate with salivary levels? | In vitro secretion assay with sero-salivary correlation |
How to Study the progesterone secretion Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Serum progesterone assay | Circulating progesterone concentration | Assessment of luteal function and ovulation |
| Salivary progesterone assay | Free progesterone concentration | Non-invasive monitoring of luteal function |
| Cell-based secretion assay | Progesterone released by cultured cells | Testing candidate genes in luteal or placental cells |
| Membrane progesterone receptor signaling assay | Non-genomic signaling readouts | Studying rapid progesterone effects |
| Endocrine profiling | Hormone levels across cycle or pregnancy | Understanding luteal-placental transition |
| Gonadotropin measurement | LH and hCG levels | Assessing support of corpus luteum |
| Steroidogenic enzyme expression analysis | Expression of steroidogenic genes | Linking gene expression to progesterone output |
| CRISPR perturbation followed by secretion assay | Effect of gene knockout on progesterone release | Causal gene discovery in luteal cells |
Steroid measurement assays
Progesterone secretion can be measured by quantifying progesterone concentrations in serum or saliva, and sero-salivary correlation has been reported. These assays are used to assess luteal function and ovulation in clinical and research settings. They provide a direct readout of the secretory process described by GO:0042701.
Cell-based secretion models
Luteal and placental cell models can be used to study the regulated release of progesterone in vitro. Such models allow perturbation of candidate genes and measurement of progesterone output. They are useful for linking molecular changes to the secretory phenotype.
Receptor signaling assays
Membrane progesterone receptor function can be studied using signaling assays, such as glycogenolysis measurements in uterine epithelium. These assays help define the downstream consequences of progesterone secretion. They complement secretion measurements by linking release to target-tissue responses.
Endocrine profiling in vivo
In vivo endocrine profiling can assess progesterone secretion across the menstrual cycle and pregnancy. Gonadotropin and lactational signals can be monitored to understand regulatory inputs. Such profiling is essential for interpreting the physiological context of progesterone secretion.
How CRISPR Can Be Used to Study GO:0042701 progesterone secretion
Knockout
CRISPR knockout can be used to delete candidate genes in luteal or placental cell models and measure the effect on progesterone secretion. This approach helps determine whether a gene is required for the regulated release of progesterone. Knockout models are particularly useful for testing steroidogenic enzymes and receptors.
Point Mutation
Point-mutation knock-in can introduce specific variants into genes suspected of affecting progesterone secretion. Such models allow researchers to test whether a particular amino acid change alters secretory function. They are valuable for dissecting structure-function relationships in steroidogenic pathways.
Knock-in
Tagged knock-in can add reporters or affinity tags to genes involved in progesterone secretion, enabling tracking of protein localization or secretion dynamics. Knock-in models can also be used to express physiological levels of a gene of interest. These approaches support precise studies of the secretory machinery.
Overexpression
Overexpression models can be used to test whether increased levels of a receptor or enzyme enhance progesterone secretion or signaling. For example, overexpression of membrane progesterone receptors can amplify non-genomic responses. Such models complement loss-of-function studies by revealing gain-of-function effects.
How EDITGENE Supports progesterone secretion Research
Researchers studying progesterone secretion-related genes often need to determine whether a candidate gene is causally involved in the regulated release of progesterone, and CRISPR-based models provide a direct way to test this.
Contact EDITGENE today to design your custom CRISPR model for progesterone secretion research.
Frequently Asked Questions About progesterone secretion
What is progesterone secretion (GO:0042701)?
Progesterone secretion is the regulated release of progesterone, a steroid hormone, by the corpus luteum of the ovary and by the placenta.
What genes are involved in progesterone secretion?
Genes involved include steroidogenic enzymes such as STAR, CYP11A1, and HSD3B1, as well as receptors such as PGR and membrane progesterone receptors.
Where does progesterone secretion occur?
Progesterone secretion occurs primarily in the corpus luteum of the ovary and in the placenta.
Why is progesterone secretion important for pregnancy?
Progesterone secretion supports the endometrium and helps maintain early pregnancy, with a later shift to placental production.
What is luteal phase insufficiency?
Luteal phase insufficiency is a condition of inadequate progesterone secretion that has been linked to infertility and early pregnancy loss.
How is progesterone secretion measured?
Progesterone secretion can be assessed by measuring progesterone in serum or saliva, and sero-salivary correlation has been reported.
What is the luteal-placental shift?
The luteal-placental shift is the transition from corpus luteum-derived progesterone secretion to placental progesterone secretion during pregnancy.
Can membrane progesterone receptors mediate progesterone effects?
Yes, membrane progesterone receptors can mediate rapid non-genomic effects, such as progesterone-stimulated glycogenolysis in uterine epithelium.
How do researchers study progesterone secretion with CRISPR?
Researchers use CRISPR knockout, point-mutation, knock-in, and overexpression models to test how specific genes affect progesterone secretion.
What is the role of the corpus luteum in progesterone secretion?
The corpus luteum is the principal source of progesterone during the luteal phase and is essential for early pregnancy support.
Conclusion
GO:0042701 progesterone secretion defines the regulated release of progesterone by the corpus luteum and placenta, a process central to the menstrual cycle and pregnancy maintenance. Its clinical relevance is underscored by luteal phase insufficiency and the luteal-placental shift. Measuring progesterone in serum or saliva provides a practical readout for research and clinical assessment. CRISPR-based models, including knockout, point-mutation, knock-in, and overexpression approaches, offer powerful tools to dissect the genes that control progesterone secretion. By combining these models with endocrine and signaling assays, researchers can clarify the mechanisms underlying this essential reproductive process.
References
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- 4. Berg MD et al.. 2024. Membrane progesterone receptors mediate progesterone-stimulated glycogenolysis in the bovine uterine epithelium.. Reproduction 168(6) PMID: 39226129
- 5. Elder MG. 1984. Injectable contraception.. Clin Obstet Gynaecol 11(3):723-41 PMID: 6239732
- 7. Bolaji II. 1994. Sero-salivary progesterone correlation.. Int J Gynaecol Obstet 45(2):125-31 PMID: 7915680
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