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Human SSTR2 Stable Cell Line-CHO-K1

For research use only. Not intended for any clinical use.

Cat. No. :   CSC-RG1215

Host Cell :   CHO-K1 Size :   >1x106 frozen cells/vial

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Cat. No. CSC-RG1215
Description This cell line is engineered to stably overexpress Human SSTR2 in CHO-K1 cells.
Target Gene SSTR2
Gene Species Homo sapiens (Human)
Host Cell CHO-K1
Host Cell Species Cricetulus griseus (Chinese hamster)
Applications

1. Gene expression studies

2. Signaling pathway research

3. Drug screening and toxicology

4. Research on the mechanisms of GPCR-related diseases

Size >1x106 frozen cells/vial
Stability Validated for at least 10 passages
Quality Control Negative for bacteria, yeast, fungi and mycoplasma.
Storage Liquid nitrogen
Shipping Dry ice
Revival Rapidly thaw cells in a 37°C water bath. Transfer contents into a tube containing pre-warmed media. Centrifuge cells and seed into a 25 cm2 flask containing pre-warmed media.
Mycoplasma Negative
Format One frozen vial containing millions of cells
Storage Liquid nitrogen
Safety Considerations The following safety precautions should be observed.
1. Use pipette aids to prevent ingestion and keep aerosols down to a minimum.
2. No eating, drinking or smoking while handling the stable line.
3. Wash hands after handling the stable line and before leaving the lab.
4. Decontaminate work surface with disinfectant or 70% ethanol before and after working with stable cells.
5. All waste should be considered hazardous.
6. Dispose of all liquid waste after each experiment and treat with bleach.
Ship Dry ice
Gene Name SSTR2 somatostatin receptor 2 [ Homo sapiens ]
Gene Symbol SSTR2
Gene Description somatostatin receptor 2
GeneID 6752
Uni ProtID P30874
mRNA Refseq NM_001050.2
Protein Refseq NP_001041.1
Chromosome Location 17q24
Function PDZ domain binding; protein binding; somatostatin receptor activity;
Pathway Class A/1 (Rhodopsin-like receptors), organism-specific biosystem; G alpha (i) signalling events, organism-specific biosystem; GPCR downstream signaling, organism-specific biosystem; GPCR ligand binding, organism-specific biosystem; GPCRs, Class A Rhodopsin-like, organism-specific biosystem; GPCRs, Other, organism-specific biosystem; Gastric acid secretion, organism-specific biosystem;
MIM 182452
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Human SSTR2 encodes a Gi/o-coupled somatostatin receptor widely studied in neuroendocrine tissues and tumors. Its activation by somatostatin and related peptide analogs initiates inhibition of adenylyl cyclase together with effects on ion channels, phosphatases, secretion, and proliferation, making receptor abundance and cellular context important determinants of experimental response. This product is a stable CHO-K1 cell line engineered to maintain elevated expression of human SSTR2. This cell line is engineered to stably overexpress Human SSTR2 in CHO-K1 cells. CHO-K1 cells offer robust growth, a comparatively low endogenous background for many human receptors, and a long history of use in pharmacology and screening. Stable integration reduces the experiment-to-experiment variability associated with transient transfection and supports repeated use across assay campaigns.

Functionally, the line is intended to provide consistent access to human SSTR2-dependent biology. It is particularly suitable for agonist and antagonist profiling, ligand-binding assays, receptor internalization studies, potency ranking of somatostatin analogs, and research related to endocrine signaling, neuroendocrine tumors, and receptor-targeted imaging or therapy. As a defined receptor-overexpression model, the cell line complements primary cells and tissue-derived systems by isolating target-dependent signaling from the complexity of mixed receptor populations. Its stable phenotype supports comparative pharmacology across compound series, biologic formats, and repeated screening campaigns, while preserving the same host-cell background for mechanistic interpretation. The model also provides a consistent framework for linking receptor occupancy to proximal signaling, receptor trafficking, and downstream cellular responses relevant to target validation and drug discovery. Receptor-focused datasets generated with this line can clarify ligand potency, efficacy, selectivity, desensitization, and internalization within a single cellular context. The platform is also relevant to comparative studies of small molecules, peptides, antibodies, and other biologic modulators directed at the same signaling axis.

Somatostatin receptor 2 (SSTR2) is frequently overexpressed in various solid tumors, including neuroendocrine tumors and small-cell lung cancer. Peptide agonists of SSTR2 undergo rapid internalization upon binding to the receptor; conjugating a cytotoxic payload to an SSTR2 agonist represents a potential strategy for killing SSTR2-expressing tumor cells. Here, researchers developed a highly potent SSTR2-targeting cytotoxic conjugate; through the screening and evaluation of various SSTR2-targeting ligands, conjugation sites, and payloads, they identified compound 22 (PEN-221). This conjugate consists of the microtubule-targeting agent DM1 linked to the C-terminal side chain of Tyr3-octreotate. PEN-221 demonstrated potent (IC50 = 10 nM) and receptor-dependent (with a 90-fold shift in IC50 upon receptor blockade) biological activity in vitro. PEN-221 enabled the targeted delivery of high doses of DM1 to SSTR2-expressing xenograft tumors and achieved tumor regression across multiple mouse xenograft models expressing SSTR2. Currently, the safety and efficacy of PEN-221 are being evaluated in human clinical trials.

Researchers evaluated the affinity of each conjugate for SSTR2 by displacing [I125]Tyr11-SST14 bound to membrane fractions of SSTR2-expressing CHO-K1 cells. Additionally, the in vitro cytotoxicity of the octreotide conjugates was assessed using SSTR2-expressing NCI-H524 cells. The conjugates were incubated with NCI-H524 cells for 2 hours-either alone or in the presence of 100 μM octreotide-followed by drug washout and a further 70-hour incubation; Figure 1 illustrates a typical in vitro experimental procedure. Incubation in the presence of octreotide was intended to fully saturate cell-surface SSTR2, thereby blocking receptor-mediated uptake of the conjugates. Differences in potency observed under receptor-blocking conditions compared to treatment with the conjugate alone served as key evidence that the cytotoxic effects of the conjugates were dependent on receptor binding and endocytosis.

Figure 1. Payload and conjugate cytotoxicity of 7 and 8 in NCI-H524 cells with and without receptor blockade, plus their respective payloads.Figure 1. Payload and conjugate cytotoxicity of 7 and 8 in NCI-H524 cells with and without receptor blockade, plus their respective payloads. (White B H, et al., 2019)

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Customer Reviews
Reliable Tool

Our lab focuses on neuroendocrine tumor targeting, and this SSTR2 cell line has been invaluable. We achieved brilliant fluorescence imaging results for receptor internalization. The cells are robust, multiply beautifully, and maintain stable transgene expression without any issues.

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