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• W2068951489 abstract "CXCL12/stromal cell-derived factor 1 is a member of the CXC family of chemokines that plays an important role in hematopoiesis and signals through CXCR4 and CXCR7. Two splice variants of human CXCL12 (CXCL12alpha and CXCL12beta) induce chemotaxis of CXCR4(+) cells and inhibit X4 infection. Recent studies described four other novel splice variants of human CXCL12; however, their antiviral activities were not investigated. We constructed and expressed all of the CXCL12 splice variants in Escherichia coli. Recombinant proteins were purified through a His affinity column, and their biological properties were analyzed. All six CXCL12 variants induced chemotaxis of CXCR4(+) and CXCR7(+) cell lines. Enhancement of survival and replating capacity of human hematopoietic progenitor cells were observed with CXCL12alpha, CXCL12beta, and CXCL12epsilon but not with the other variants. CXCL12gamma showed the greatest antiviral activity in X4 inhibition assays and the weakest chemotaxis activity through CXCR4. The order of potency in X4 inhibition assays was as follows: CXCL12gamma > CXCL12beta > CXCL12alpha > CXCL12theta > CXCL12epsilon > CXCL12delta. The order of anti-human immunodeficiency virus (HIV) activity was associated with the number of BBXB motifs present in each variant; the most potent inhibitor was CXCL12gamma, with five BBXB domains. The results suggest that the different C termini of CXCL12 variants may contain important molecular determinants for the observed differences in antiviral effects and other biological functions. These studies implicate CXCL12gamma as a potent HIV-1 entry inhibitor with significantly reduced chemotaxis activity and small or absent effects on progenitor cell survival or replating capacity, providing important insight into the structure-function relationships of CXCL12." @default.
• W2068951489 created "2016-06-24" @default.
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• W2068951489 date "2007-08-01" @default.
• W2068951489 modified "2023-09-26" @default.
• W2068951489 title "A Naturally Occurring Splice Variant of CXCL12/Stromal Cell-Derived Factor 1 Is a Potent Human Immunodeficiency Virus Type 1 Inhibitor with Weak Chemotaxis and Cell Survival Activities" @default.
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• W2068951489 doi "https://doi.org/10.1128/jvi.00268-07" @default.
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• W2068951489 hasPublicationYear "2007" @default.
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