cAMP-specific 3',5'-cyclic phosphodiesterase 4B is an enzyme that in humans is encoded by the PDE4Bgene.
This gene is a member of the type IV, cyclic AMP (cAMP)-specific, cyclic nucleotide phosphodiesterase (PDE) family. Cyclic nucleotides are important second messengers that regulate and mediate a number of cellular responses to extracellular signals, such as hormones, light, and neurotransmitters. The cyclic nucleotide phosphodiesterases (PDEs) regulate the cellular concentrations of cyclic nucleotides and thereby play a role in signal transduction. This gene encodes a protein that specifically hydrolyzes cAMP. Alternate transcriptional splice variants, encoding different isoforms, have been characterized.
Altered activity of this protein has been associated with schizophrenia and bipolar disorder. PDE4B is believed to be the PDE4 subtype involved in the antipsychotic effects of PDE4 inhibitors such as rolipram. PDE4B is involved in dopamine-associated and stress-related behaviours. It has also recently been found to modulate cognition, as reduction in PDE4B activity improves memory and long-term plasticity in mouse models, possibly supporting further therapeutic applications.
^Nazarian R, Weinberg JM (Nov 2009). "AN-2728, a PDE4 inhibitor for the potential topical treatment of psoriasis and atopic dermatitis". Current Opinion in Investigational Drugs. 10 (11): 1236–42. PMID19876791.
Szpirer C, Szpirer J, Rivière M, Swinnen J, Vicini E, Conti M (1995). "Chromosomal localization of the human and rat genes (PDE4D and PDE4B) encoding the cAMP-specific phosphodiesterases 3 and 4". Cytogenetics and Cell Genetics. 69 (1–2): 11–4. doi:10.1159/000133927. PMID7835077.
Bolger GB, Rodgers L, Riggs M (Nov 1994). "Differential CNS expression of alternative mRNA isoforms of the mammalian genes encoding cAMP-specific phosphodiesterases". Gene. 149 (2): 237–44. doi:10.1016/0378-1119(94)90155-4. PMID7958996.
Milatovich A, Bolger G, Michaeli T, Francke U (Mar 1994). "Chromosome localizations of genes for five cAMP-specific phosphodiesterases in man and mouse". Somatic Cell and Molecular Genetics. 20 (2): 75–86. doi:10.1007/BF02290677. PMID8009369. S2CID19182571.
Ma D, Wu P, Egan RW, Billah MM, Wang P (Jan 1999). "Phosphodiesterase 4B gene transcription is activated by lipopolysaccharide and inhibited by interleukin-10 in human monocytes". Molecular Pharmacology. 55 (1): 50–7. doi:10.1124/mol.55.1.50. PMID9882697. S2CID20419284.
Zauli G, Milani D, Mirandola P, Mazzoni M, Secchiero P, Miscia S, Capitani S (Feb 2001). "HIV-1 Tat protein down-regulates CREB transcription factor expression in PC12 neuronal cells through a phosphatidylinositol 3-kinase/AKT/cyclic nucleoside phosphodiesterase pathway". FASEB Journal. 15 (2): 483–91. doi:10.1096/fj.00-0354com. PMID11156964. S2CID26315564.
Moon E, Lee R, Near R, Weintraub L, Wolda S, Lerner A (Feb 2002). "Inhibition of PDE3B augments PDE4 inhibitor-induced apoptosis in a subset of patients with chronic lymphocytic leukemia". Clinical Cancer Research. 8 (2): 589–95. PMID11839681.