title: Krüppel-like factors 4 and 5: the yin and yang regulators of cellular proliferation.
abstract: Krüppel-like factors (KLFs) are evolutionarily conserved zinc finger-containing transcription factors with diverse regulatory functions in cell growth, proliferation, differentiation, and embryogenesis. KLF4 and KLF5 are two closely related members of the KLF family that have a similar tissue distribution in embryos and adults. However, the two KLFs often exhibit opposite effects on regulation of gene transcription, despite binding to similar, if not identical, cis-acting DNA sequences. In addition, KLF4 and 5 exert contrasting effects on cell proliferation in many instances; while KLF4 is an inhibitor of cell growth, KLF5 stimulates proliferation. Here we review the biological properties and biochemical mechanisms of action of the two KLFs in the context of growth regulation.
authors.affiliation: Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA.
authors.forename: Amr M
authors.initials: AM
authors.lastname: Ghaleb
authors.forename: Mandayam O
authors.initials: MO
authors.lastname: Nandan
authors.forename: Sengthong
authors.initials: S
authors.lastname: Chanchevalap
authors.forename: W Brian
authors.initials: WB
authors.lastname: Dalton
authors.forename: Irfan M
authors.initials: IM
authors.lastname: Hisamuddin
authors.forename: Vincent W
authors.initials: VW
authors.lastname: Yang
mesh_terms: D000818:Animals; D049109:Cell Proliferation; D004268:DNA-Binding Proteins / Q000235:genetics / Q000502:physiology*; D005786:Gene Expression Regulation; D006801:Humans; D000090062:Kruppel-Like Factor 4; D051741:Kruppel-Like Transcription Factors; D051379:Mice; D009369:Neoplasms / Q000209:etiology; D015534:Trans-Activators / Q000235:genetics / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics / Q000502:physiology*
chemical_list: D004268:DNA-Binding Proteins; C000715467:KLF4 protein, human; C492214:KLF5 protein, human; C000715468:Klf4 protein, mouse; C118391:Klf5 protein, mouse; D000090062:Kruppel-Like Factor 4; D051741:Kruppel-Like Transcription Factors; D015534:Trans-Activators; D014157:Transcription Factors
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