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As an artificially synthesized peptide, pentagastrin injection has three core functions: endocrine regulation, tumor related stimulation detection, and ectopic mucosal imaging. These three functions are independent of each other and have their own clinical application value, together forming its core application system. The following provides a detailed analysis of these three functions from multiple perspectives.
Products Description
Pentagastrin COA
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| Certificate of Analysis | ||
| Compound name | Pentagastrin | |
| Grade | Pharmaceutical grade | |
| CAS No. | 5534-95-2 | |
| Quantity | 36g | |
| Packaging standard | PE bag+Al foil bag | |
| Manufacturer | Shaanxi BLOOM TECH Co., Ltd | |
| Lot No. | 202501090097 | |
| MFG | Jan 9th 2026 | |
| EXP | Jan 8th 2029 | |
| Structure |
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| Item | Enterprise standard | Analysis result |
| Appearance | White or almost white powder | Conformed |
| Water content | ≤5.0% | 0.54% |
| Loss on drying | ≤1.0% | 0.42% |
| Heavy Metals | Pb≤0.5ppm | N.D. |
| As≤0.5ppm | N.D. | |
| Hg≤0.5ppm | N.D. | |
| Cd≤0.5ppm | N.D. | |
| Purity (HPLC) | ≥99.0% | 99.98% |
| Single impurity | <0.8% | 0.52% |
| Total microbial count | ≤750cfu/g | 95 |
| E. Coli | ≤2MPN/g | N.D. |
| Salmonella | N.D. | N.D. |
| Ethanol (by GC) | ≤5000ppm | 500ppm |
| Storage | Store in a sealed, dark, and dry place below -20°C | |
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| Chemical Formula | C37H49N7O9S | |
| Exact Mass | 767.33 | |
| Molecular Weight | 767.90 | |
| m/z | 767.33 (100.0%), 768.33 (40.0%), 769.34 (5.1%), 769.33 (4.5%), 769.34 (2.7%), 769.34 (1.8%), 768.33 (1.8%), 770.33 (1.8%) | |
| Elemental Analysis | C, 57.87; H, 6.43; N, 12.77; O, 18.75; S, 4.18 | |
Multidimensional characteristics of endocrine activation
The endocrine activation effect of pentagastrin injection has clear targeting and specificity, and its core is to induce the release of specific hormones by precisely regulating the function of target cells. This can be analyzed from three dimensions:
Differential expression of histamine and serotonin release
There is a significant selective difference in the induction and release of histamine and serotonin. Histamine release mostly occurs shortly after administration, showing a rapid increase effect and rapidly falling back after reaching its peak, while serotonin release shows a slow rise and slow fall characteristic, with the peak appearing later than histamine, and the release amounts of the two are related to the administration route. This differentiated release pattern is closely related to their different roles in physiological regulation of the body and provides a unique entry point for the study of related physiological mechanisms.
The dose-dependent characteristics of calcitonin release
The efficacy of inducing the release of calcitonin from thyroid C cells shows a clear dose-dependent relationship. Low dose intervention can only induce a small amount of calcitonin release. When the dosage reaches the threshold, the amount of calcitonin release increases step by step, and the duration of release remains stable in a specific range, which is significantly different from the physiological basal release rhythm of calcitonin. This dose-dependent feature provides important support for precise clinical regulation, and this effect can also participate in indirect regulation of postprandial calcium homeostasis.
Specific mediation of regulatory pathways
Its endocrine activation effect depends on receptor dependent signaling pathways, which specifically bind to corresponding receptors on the surface of target cells, initiate intracellular signaling cascades, and induce the release of related hormones. This process does not rely on the participation of other exogenous regulatory factors and has high targeting selectivity, only targeting thyroid C cells and histamine and serotonin secretion related cells, without interfering with the normal function of other endocrine cells.
Source of information:
Emine Kartal Baykan, Mehmet Erdoğan. Basal and pentagastrin-stimulated calcitonin cut-off values in diagnosis of preoperative medullary thyroid cancer. Turkish Journal of Medical Sciences, 2021, 51: 650-656.
Li Juan, Wang Hao Study on the regulatory effect of pentagastrin on the secretion of calcitonin by thyroid C cells Chinese Journal of Experimental Diagnosis, 2021, 25 (3): 412-415
Clinical efficacy of pentagastrin stimulation test
The pentagastrin injection stimulation test has become a core tool for tumor diagnosis and postoperative monitoring due to its unique stimulation effect. Its efficacy can be analyzed from four dimensions: experimental mechanism, operational characteristics, detection advantages, and monitoring value.
The core triggering mechanism of the experiment.
The core principle of this stimulation experiment is that pentapeptide gastric secretin can specifically activate the secretion function of thyroid C cells.
Even early or occult diseased cells can be induced to release sufficient amounts of calcitonin, thereby breaking through the limitations of basal state calcitonin detection and revealing abnormal secretion of diseased cells, providing clear signal support for lesion detection.
The key nodes of experimental operation.
The implementation of the experiment needs to follow strict operating procedures, and the administration method is mostly intravenous injection. The dosage is controlled within a specific safety range, and the blood sample collection nodes are accurately set at 2-5 minutes and 30 minutes after administration. Through blood sample testing at multiple time points, detection errors can be effectively reduced to ensure the reliability and repeatability of the experimental results. At the same time, it should be carried out on an empty stomach to avoid interference from dietary factors on hormone release.
The detection advantage of early/hidden MTC.
Compared with basic calcitonin testing, this experiment can significantly improve the detection efficiency of early and occult MTC, especially for cases where the basic calcitonin level is at a critical value. It can effectively distinguish benign hyperplasia from malignant lesions, reduce the missed diagnosis rate, and its detection sensitivity is significantly better than other conventional testing methods, providing key support for early intervention of MTC.
The monitoring value of postoperative recurrence follow-up.
In the monitoring of postoperative recurrence in MTC, this test can serve as a core evaluation tool. If the postoperative stimulation test can still induce a significant increase in calcitonin, it suggests the possibility of tumor residue or recurrence, and the magnitude of calcitonin elevation is positively correlated with tumor burden; If the postoperative stimulation test cannot induce a significant increase in calcitonin and the baseline calcitonin level is within the normal range, it indicates that the surgical resection is more thorough. At the same time, the surgical efficacy and recurrence risk can be dynamically evaluated through the test results at different time points after surgery.
Source of information:
Pasquali D, et al. Prognostic value of early postoperative calcitonin level in medullary thyroid carcinoma. Journal of Endocrinological Investigation, 1994, 17(4): 301-305.
Labor Nordlab. Calcitonin-Stimulationstest (Pentagastrin-Test). Nordlab Guidelines, 2020.
Characteristics of nuclear medicine imaging in Meckel's diverticulum
The application of pentagastrin in nuclear medicine imaging of Meckel's diverticulum is mainly achieved by stimulating ectopic gastric mucosa to locate lesions. Its functional characteristics can be analyzed from four dimensions: imaging mechanism, technical advantages, efficacy characteristics, and applicable scenarios.
The core induction mechanism of development. Its mechanism of action in nuclear medicine imaging is to specifically induce the activation of ectopic gastric mucosal tissue in the Merkel diverticulum, enhance its ability to uptake radioactive isotopes, and create significant imaging differences between ectopic mucosa and surrounding normal intestinal mucosa, thereby achieving accurate localization of lesions. This induction effect has high tissue specificity and only works on ectopic gastric mucosa.
Technical adaptability of nuclide imaging. The imaging process requires the use of technetium-99m labeled imaging agent.After administration of pentagastrin injection, dynamic monitoring is performed using a nuclear imaging device.The imaging of ectopic gastric mucosa often occurs at a specific time after administration, and the imaging intensity is positively correlated with the area and activity of the ectopic mucosa. It can clearly present the morphology, size, and location of the ectopic mucosa, providing intuitive imaging evidence for clinical diagnosis.
The unique advantage of developing efficiency.Compared with traditional imaging methods, this imaging technique has higher specificity and sensitivity, especially for occult Meckel's diverticulum.It can effectively compensate for the limitations of endoscopy and conventional CT examination, reduce the occurrence of missed diagnosis, and is easy to operate and minimally invasive.It can be applied to patients of different ages, especially children and those who are intolerant to endoscopic examination.Targeted application scenarios.
This imaging method is mainly suitable for cases with high suspicion of Meckel's diverticulum in clinical practice but no clear positive findings on routine examinations, especially for patients with unexplained gastrointestinal bleeding and abdominal pain. It can be used to clarify the location of the lesion and provide accurate basis for the development of clinical diagnosis and treatment plans. It can also be used for postoperative efficacy evaluation of Meckel's diverticulum.
Source of information:
Gagel RF, et al. Comparison of Two Provocative Tests for Calcitonin in Medullary Thyroid Carcinoma: Omeprazole vs Pentagastrin. Clinical Chemistry, 2002, 48(9): 1505-1511.
References
Salvador Treves, Richard J. Grand, Angelo J. Eraklis. Pentagastrin Stimulation of Technetium-99m Uptake by Ectopic Gastric Muscosa in a Meckel's Diverticulum. Radiology, 1978, 128(3): 711-714.
The Society of Nuclear Medicine and Molecular Imaging. Procedure Guideline for Gastrointestinal Bleeding and Meckel's Diverticulum Scintigraphy. Journal of Nuclear Medicine, 2009, 40(7): 1226-1236.
Persson B, Lulhman C. Studies on Pentagastrin-Induced Hypocalcaemia in Lactating Cows. Acta Veterinaria Scandinavica, 1976, 17(2): 127-136.
A. Izzat, N. G. Waton. Release of 5-Hydroxytryptamine by Pentagastrin and Its Role in the 'Fade' of Stimulated Gastric Secretion in Cats. The Journal of Physiology, 1978, 283(3): 491-502.
FAQ
What is pentagastrin used for?
Pentagastrin is a gastrin-like molecule used as a diagnostic aid for the evaluation of gastric acid secretory function, gastric hypersecretion, and Zollinger-Ellison tumors. A synthetic pentapeptide that mimics the actions of endogenous gastrin when given parenterally.
What is a pentagastrin stimulation test?
The purpose of this test is to help us find out if there is an overproduction of calcitonin hormone by your thyroid gland. Over production of calcitonin hormone may indicate the presence of a rare type of thyroid cancer. Preparation for your test.
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