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Gap 27 Selective gap junction blocker

Catalog No.A1045
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Sample solution is provided at 25 µL, 10mM.

Product Citations

1.Ni X, Li XZ, et al. "Increased expression and functionality of the gap junction in peripheral blood lymphocytes is associated with hypertension-mediated inflammation in spontaneously hypertensive rats." Cell Mol Biol Lett. 2018 Aug 20;23:40. PMID:30151015
2.HAI-CHAO ZHANG, ZHONG-SHUANG ZHANG, et al."Connexin 43 in splenic lymphocytes is involved in the regulation of CD4+ CD25+ T lymphocyte proliferation and cytokine production in hypertensive inflammation." INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE. 2017 October 20.
3.Ni X, Wang A, et al. "Up-regulation of gap junction in peripheral blood T lymphocytes contributes to the inflammatory response in essential hypertension." PLoS One. 2017 Sep 14;12(9):e0184773. PMID:28910394
4.Koenen, Anna, et al. "Effects of renal denervation on renal pelvic contractions and connexin expression in rats." Acta Physiologica (2015). PMID:26436542

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Chemical structure

Gap 27

Related Biological Data

Gap 27

Related Biological Data

Gap 27

Related Biological Data

Gap 27

Related Biological Data

Gap 27

Related Biological Data

Gap 27

Biological Activity

Description Gap 27 is a peptide(Ser-Arg-Pro-Thr-Glu-Lys-Thr-Ile-Phe-Ile-Ile) derived from connexin 43 that is a selective gap junction blocker.


Cell experiment: [1]

Cell lines

Rat osteoclasts

Preparation method

The solubility of this peptide in sterile water is >10 mM. Stock solution should be splited and stored at -80°C for several months.

Reaction Conditions

500 μM, 48 hours


Heptanol-treated cells acted as positive controls for gap-junctional inhibition. A significant decrease could be seen in the number of both TRAP-positive mononuclear and multinucleated cells with Gap 27 compared to controls. The numbers of TRAP-positive mononuclear and multinucleated cells with both treatments were very similar. After the 48-hour incubation, survival of osteoclasts was clearly reduced in the groups where gap-junctional communication was blocked either by heptanol or Gap 27.

Animal experiment: [2]

Animal models

Female Sprague-Dawley rats

Dosage form

300 μM, 45 min


The rats were prepared with closed cranial windows 24 h before the study. A 10-mm-diameter craniotomy was performed over the skull midline. The dura was removed carefully to keep the sagittal sinus intact. An 11-mm-diameter glass window outfitted with three ports was glued to the skull using cyanoacrylate. The skin overlying the window was sutured, and the animals were permitted to recover. On the day of study, three stainless steel screws were inserted into the skull, along the periphery of the cranial window, for electroencephalogram (EEG) recording. Cannulae were then connected to the three ports. The rats were subjected to one of two neuronal activation paradigms: SNS or bicuculline-induced seizure. Following the initial measurement of pial arteriolar diameter changes during SNS or during bicuculline exposure, baseline conditions were reestablished. After 20 min, a suffusion of gap-27 was initiated. Forty-five minutes later, the neural activation was repeated. Application of gap-27 peptide attenuated bicuculline-induced pial arteriolar dilation (by ~ 50%), without altering neuronal activation. A similar result was obtained with the SNS-associated pial arteriolar response, although the degree of reduction in the vasodilating response (~ 75%) was somewhat greater.

Other notes

Please test the solubility of all compounds indoor, and the actual solubility may slightly differ with the theoretical value. This is caused by an experimental system error and it is normal.


[1] Ilvesaro J, Tavi P, Tuukkanen J. Connexin-mimetic peptide Gap 27 decreases osteoclastic activity. BMC musculoskeletal disorders, 2001, 2(1): 10.

[2] Xu H L, Mao L, Ye S, et al. Astrocytes are a key conduit for upstream signaling of vasodilation during cerebral cortical neuronal activation in vivo. American Journal of Physiology-Heart and Circulatory Physiology, 2008, 294(2): H622-H632.

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Chemical Properties

Cas No. 198284-64-9 SDF Download SDF
Synonyms Ser-Arg-Pro-Thr-Glu-Lys-Thr-Ile-Phe-Ile-Ile
Chemical Name Gap 27
Formula C60H101N15O17 M.Wt 1304.55
Solubility ≥65.25mg/mL in DMSO, ≥5mg/mL in H2O Storage Desiccate at -20°C
Physical Appearance A solid Shipping Condition Evaluation sample solution : ship with blue ice.All other available size: ship with RT , or blue ice upon request
General tips For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months.


Gap 27 is a peptide(Ser-Arg-Pro-Thr-Glu-Lys-Thr-Ile-Phe-Ile-Ile) derived from connexin 43 that is a selective gap junction blocker.

Connexins, or gap junctions, are a family of structurally-related transmembrane proteins. Gap junctions contain channels that allow the passage of ions and small molecules between adjacent cells. This intercellular communication has been implicated in the coordination of cellular responses to intracellular signaling molecules. Calcium and inositol phosphates are among the second messengers that can pass through gap junction channels. This synthetic connexin-mimetic peptide, Gap 27, was used to evaluate the contribution of gap-junctional communication to osteoclastic bone resorption. It was concluded that gap-junctional communication is necessary for proper bone remodeling.


Figure1  Formula of Gap 27


1. Berthoud, V. et al. Am. J. Physiol. Lung Cell Mol. Physiol. 279, 619 (2000)

2. Ilvesaro, J. et al. BMC Musculoskel. Disord. 2, 10 (2001)

3. Chaytor, A. et al. Brit. J. Pharmacol. 144, 108 (2005)

4. Boitano, S. and H. Evans Am. J. Physio.l Lung Cell Mol. Physiol. 279, L623 ( 2000).