title: Coreceptor requirements of primary HIV type 1 group O isolates from Cameroon.
abstract: HIV-1 group O has its epicenter in Cameroon and neighboring countries and is responsible for 3 to 5% of all HIV infections in this region. It is believed that HIV-1 group O was introduced into the human population by a separate cross-species transmission, occurring independently of the HIV-1 (group M and group N) and HIV-2 transmissions. We have studied the coreceptor requirements of 12 primary HIV-1 O-type isolates from individuals with different clinical symptoms. Only 2 of these 12 viruses showed a syncytium-inducing phenotype after infection of primary peripheral blood mononuclear cells (PBMCs) and were infectious for the T cell line C8166. These isolates used CXCR4 as a coreceptor for entry, whereas the remaining isolates used only CCR5 efficiently. One isolate was able to use BOB and CCR8 as coreceptors in addition to CXCR4. All group O isolates tested were efficiently inhibited by SDF-1 or RANTES, the natural ligands of CXCR4 and CCR5, respectively. These results indicate that CXCR4 and CCR5 are the principal coreceptors for HIV-1 O-type viruses. Most of the HIV-1 group O isolates studied were derived from patients at later stages of the disease. Although HIV-1 group O and group M infections do not differ in their pathogenesis, the studied isolates did not evolve to use a broad range of coreceptors as described for HIV-1 group M and HIV-2.
authors.affiliation: Heinrich-Pette-Institute, Hamburg, Germany. mtd@hpi.uni-hamburg.de
authors.forename: M T
authors.initials: MT
authors.lastname: Dittmar
authors.forename: L
authors.initials: L
authors.lastname: Zekeng
authors.forename: L
authors.initials: L
authors.lastname: Kaptue
authors.forename: J
authors.initials: J
authors.lastname: Eberle
authors.forename: H G
authors.initials: HG
authors.lastname: Kräusslich
authors.forename: L
authors.initials: L
authors.lastname: Gürtler
mesh_terms: D000328:Adult; D005260:Female; D015658:HIV Infections / Q000821:virology*; D015497:HIV-1 / Q000145:classification / Q000302:isolation & purification / Q000502:physiology*; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000821:virology; D008264:Macrophages / Q000821:virology; D008297:Male; D008875:Middle Aged; D019713:Receptors, CCR5 / Q000378:metabolism*; D019718:Receptors, CXCR4 / Q000378:metabolism*; D015728:Receptors, HIV / Q000378:metabolism*
chemical_list: D019713:Receptors, CCR5; D019718:Receptors, CXCR4; D015728:Receptors, HIV