The LD78beta isoform of MIP-1alpha is the most potent CC-chemokine in inhibiting CCR5-dependent human immunodeficiency virus type 1 replication in human macrophages.

Abstract:

:The CC-chemokines RANTES, macrophage inflammatory protein 1alpha (MIP-1alpha), and MIP-1beta are natural ligands for the CC-chemokine receptor CCR5. MIP-1alpha, also known as LD78alpha, has an isoform, LD78beta, which was identified as the product of a nonallelic gene. The two isoforms differ in only 3 amino acids. LD78beta was recently reported to be a much more potent CCR5 agonist than LD78alpha and RANTES in inducing intracellular Ca2+ signaling and chemotaxis. CCR5 is expressed by human monocytes/macrophages (M/M) and represents an important coreceptor for macrophage-tropic, CCR5-using (R5) human immunodeficiency virus type 1 (HIV-1) strains to infect the cells. We compared the antiviral activities of LD78beta and the other CC-chemokines in M/M. LD78beta at 100 ng/ml almost completely blocked HIV-1 replication, while at the same concentration LD78alpha had only weak antiviral activity. Moreover, when HIV-1 infection in M/M was monitored by a flow cytometric analysis using p24 antigen intracellular staining, LD78beta proved to be the most antivirally active of the chemokines. RANTES, once described as the most potent chemokine in inhibiting R5 HIV-1 infection, was found to be considerably less active than LD78beta. LD78beta strongly downregulated CCR5 expression in M/M, thereby explaining its potent antiviral activity.

journal_name

J Virol

journal_title

Journal of virology

authors

Aquaro S,Menten P,Struyf S,Proost P,Van Damme J,De Clercq E,Schols D

doi

10.1128/JVI.75.9.4402-4406.2001

subject

Has Abstract

pub_date

2001-05-01 00:00:00

pages

4402-6

issue

9

eissn

0022-538X

issn

1098-5514

journal_volume

75

pub_type

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