N⁶,2′-O-Dibutyryl-cAMP Sodium Salt: Key Facts & FAQs
N⁶,2′-O-Dibutyryl-cAMP Sodium Salt: Key Facts & FAQs
N⁶,2′-O-Dibutyryladenosine 3′,5′ -cyclic monophosphate sodium salt is a cell-permeable, metabolically stabilized analog of the second messenger cyclic AMP (cAMP) widely used in research to activate protein kinase A (PKA) and study downstream cAMP-dependent signaling pathways.
- Chemical Name
- N⁶,2′-O-Dibutyryladenosine 3′,5′-cyclic monophosphate sodium salt
- Common Abbreviation
- db-cAMP or Bt₂-cAMP
- Mechanism of Action
- Mimics intracellular cAMP; activates PKA by binding regulatory subunits, thereby releasing catalytic subunits
- Key Advantage Over cAMP
- Cell-permeable and resistant to phosphodiesterase hydrolysis, enabling sustained intracellular cAMP signaling
- Primary Research Applications
- PKA activation, neuronal differentiation, lipolysis studies, gene expression regulation, apoptosis research
- SKU
- D124575
What Is N⁶,2′-O-Dibutyryl-cAMP Sodium Salt?
N⁶,2′-O-Dibutyryladenosine 3′,5′-cyclic monophosphate sodium salt (db-cAMP) is a synthetic, membrane-permeable derivative of cyclic adenosine monophosphate (cAMP), the canonical intracellular second messenger. The compound bears two butyryl ester modifications: one at the N⁶ position of the adenine ring and one at the 2′-O position of the ribose. These acyl groups increase lipophilicity, facilitating passive diffusion across the plasma membrane. Once inside the cell, esterases cleave the butyryl groups to release active cAMP, and the unmodified ribose oxygen also confers partial resistance to phosphodiesterase (PDE) hydrolysis compared with exogenously applied cAMP.
The compound is supplied as its sodium salt form to enhance aqueous solubility, making it straightforward to prepare stock solutions in water or physiological buffers.
Mechanism of Action and Signaling Pathway
Upon cellular entry, db-cAMP activates protein kinase A (PKA, also known as cAMP-dependent protein kinase). In its inactive state, PKA exists as a tetrameric holoenzyme composed of two regulatory (R) subunits and two catalytic (C) subunits. Binding of cAMP (or its analog) to the R subunits induces a conformational change that releases the catalytic subunits in their active form. The free catalytic subunits then phosphorylate serine and threonine residues on a wide variety of substrate proteins, including transcription factors such as CREB (cAMP response element-binding protein), ion channels, metabolic enzymes, and cytoskeletal proteins.
Downstream consequences of PKA activation modulated by db-cAMP include regulation of gene transcription, promotion of neuronal differentiation and neurite outgrowth, stimulation of lipolysis in adipocytes, modulation of cardiac contractility, and control of cell survival and apoptosis. Because db-cAMP bypasses the upstream adenylyl cyclase step, it is an invaluable tool for dissecting signaling events that are strictly dependent on intracellular cAMP elevation.
Preparation, Storage, and Handling
Solubility: The sodium salt form of db-cAMP is readily soluble in water and aqueous buffers such as PBS or HEPES at neutral pH. Prepare stock solutions at concentrations of 10–100 mM in sterile water, then dilute into cell culture medium or assay buffer to the desired working concentration (typically 0.1–1 mM for cell-based assays, though optimal concentrations should be empirically determined).
Storage: Store the solid compound at –20 °C in a tightly sealed, moisture-proof container protected from light. Aqueous stock solutions should be aliquoted to avoid repeated freeze–thaw cycles and stored at –20 °C. Stability of solutions over extended periods should be verified by the end user.
Handling: Standard laboratory precautions apply. Avoid prolonged skin contact and inhalation of dust. Consult the Safety Data Sheet (SDS) for full hazard information before use. As with all reagents, use appropriate personal protective equipment (PPE).
Research Applications
db-cAMP is one of the most widely used pharmacological tools for elevating intracellular cAMP signaling in diverse biological systems. Representative applications include:
- Neuronal differentiation: db-cAMP promotes differentiation of neuronal precursor cells and neurite outgrowth in models such as PC12 cells and primary neuron cultures, often in combination with nerve growth factor (NGF).
- Lipolysis: In adipocytes, db-cAMP activates PKA-mediated phosphorylation of hormone-sensitive lipase (HSL) and perilipin, stimulating triglyceride breakdown.
- Gene expression studies: Researchers use db-cAMP to activate CREB-dependent transcription, enabling study of CRE (cAMP response element)-driven reporter genes.
- Apoptosis and cell survival: db-cAMP modulates apoptotic pathways in a cell-type-dependent manner and is used to investigate the pro- or anti-apoptotic roles of cAMP signaling.
- Cardiovascular research: db-cAMP is used to study PKA-dependent regulation of cardiac ion channels and contractile proteins in cardiomyocyte models.
- Immune cell function: Elevation of cAMP with db-cAMP is used to probe immunosuppressive signaling in T cells and other immune effector cells.
Comparison with Other cAMP Analogs
Several membrane-permeable cAMP analogs are commercially available, and choosing the correct tool compound is important for experimental validity:
- db-cAMP (this product): Well-characterized, broadly membrane-permeable, partially PDE-resistant. Metabolized intracellularly to release cAMP and butyric acid; butyric acid itself has histone deacetylase (HDAC) inhibitory activity, which researchers must consider as a potential confound in gene expression studies.
- 8-Bromo-cAMP: Highly resistant to PDE hydrolysis; activates both PKA and some Epac (exchange protein directly activated by cAMP) isoforms. Does not release butyrate upon metabolism.
- Sp-cAMPS: Non-hydrolyzable, phosphorothioate analog; highly selective PKA activator with no PDE susceptibility.
- Forskolin (indirect): Activates adenylyl cyclase to elevate endogenous cAMP; not a direct cAMP analog but often used comparatively.
When interpreting results with db-cAMP, users should include appropriate controls to account for butyric acid release and should consider using complementary analogs or PDE inhibitors to confirm specificity of observed effects.
Frequently asked questions
What is the difference between db-cAMP and regular cAMP, and why use db-cAMP in cell culture?
Regular cAMP is hydrophilic and does not efficiently cross the plasma membrane, and any that enters the cell is rapidly degraded by phosphodiesterases. db-cAMP overcomes both limitations: the butyryl modifications increase lipophilicity for membrane permeation, and the molecule is partially resistant to PDE hydrolysis, resulting in a more sustained and robust elevation of intracellular cAMP signaling compared with exogenous cAMP application.
What working concentration of db-cAMP should I use in my cell-based experiment?
Reported working concentrations in cell-based assays typically range from 100 µM to 1 mM, but the optimal concentration is highly cell-type- and assay-dependent and should be determined empirically by dose–response experimentation. Starting with a range of 0.1, 0.3, and 1 mM is a common approach. Note that at higher concentrations, the butyric acid released upon intracellular hydrolysis may independently affect gene expression through HDAC inhibition.
How should I prepare and store stock solutions of db-cAMP sodium salt?
Dissolve db-cAMP sodium salt in sterile, nuclease-free water or an appropriate aqueous buffer to prepare a concentrated stock solution (typically 10–100 mM). Divide into single-use aliquots and store at –20 °C protected from light. Avoid repeated freeze–thaw cycles, which can degrade the compound. Always prepare fresh dilutions in cell culture medium immediately before use, and verify solution stability if storing for extended periods.
Does the butyric acid released from db-cAMP metabolism affect my experiment?
Yes, this is an important consideration. Butyric acid is a well-known inhibitor of histone deacetylases (HDACs) and can independently alter gene expression, chromatin structure, and cell differentiation independently of PKA activation. Researchers studying transcriptional or epigenetic endpoints should include appropriate controls such as cells treated with equivalent concentrations of sodium butyrate alone, or use alternative cAMP analogs such as 8-Bromo-cAMP or Sp-cAMPS that do not release butyrate.
Is db-cAMP selective for PKA, or does it also activate Epac proteins?
db-cAMP primarily activates PKA; however, because it is metabolized to release free cAMP intracellularly, it can also activate Epac (exchange protein directly activated by cAMP) isoforms, which mediate PKA-independent cAMP signaling. For experiments requiring strict PKA selectivity, consider using PKA-selective analogs such as Sp-cAMPS or N6-phenyl-cAMP, and pair with Epac-selective analogs (e.g., 8-pCPT-2′-O-Me-cAMP) as controls to dissect the respective contributions.
References
- Henion PD, Weston JA. Retinoic acid selectively promotes the survival and proliferation of neurogenic precursors in cultured neural crest cell populations. Exp Cell Res. 1994. [General reference for db-cAMP use in neuronal differentiation models — specific citation needs verification]
- Beebe SJ, Corbin JD. Cyclic nucleotide-dependent protein kinases. In: Boyer PD, Krebs EG, eds. The Enzymes. Vol. XVII. Academic Press; 1986. [Textbook-level reference for PKA mechanism]
- Miller WR. Regulatory subunits of PKA and breast cancer. Endocr Relat Cancer. 2002. [Reference for cAMP/PKA signaling in disease context — specific citation needs verification]
- de Rooij J, Zwartkruis FJ, Verheijen MH, et al. Epac is a Rap1 guanine-nucleotide-exchange factor directly activated by cyclic AMP. Nature. 1998;396(6710):474-477. doi:10.1038/24884
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