Invest in ME Conference 12: First Class in Every Way
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Maloney MuLv-What is this?

Discussion in 'XMRV Testing, Treatment and Transmission' started by Mya Symons, Mar 12, 2011.

  1. Mya Symons

    Mya Symons Mya Symons

    What is Maloney MuLv? How long have they been messing around with MuLv's? I looked this up on google scholar and there are hundreds of research papers that mention Maloney MuLv and one other MuLv. The following seems to indicate it can be infectious to humans, but only if it is injected. How would they know this--it seems like they have injected it into humans before. Why would they be injecting it into humans? (Am I reading this wrong. Are they actually saying that if they injected one part of the virus with another virus, it would be contagious to humans?) Further, if they have been messing around with these for so long, wouldn't there be a much greater risk that something combined in a laboratory (before the prostate studies) to create a infectious MuLv that got out of the lab?

    Retroviruses/Moloney Murine Leukemia Virus (MoMuLV)
    Risks of MMLV vectors: Data suggests a pathogenic mechanism in which chronic productive retroviral
    infection allowed insertional mutagenesis leading to cell transformation and tumor formation. Pseudotyping
    also increases host range and risk of infection.
    General criteria for a risk assessment:
    Host Range: The host range of recombinant MoMuLV vectors is dependent on the specificity of
    the viral envelope. The ecotropic env gene produces particles that infect only rodent cells. Am
    photropic env gene allows infection of murine and non-murine cells, including human.
    Zoonosis: None, unless pseudotyped
    Clinical Manifestation: In vivo infection in humans appears to require direct injection with
    amphotropic or pseudotyped virus. Cell transformation and tumor formation.
    Infectious Dose: Unknown
    Cell types able to be infected/transduced: Cell division is required for infection.
    Transgene considerations: Is the transgene oncogenic or biotoxic? If so, increased risk. Host
    -vector systems:
    Vector information: MoMuLV integrates into the host genome and is present in infected cells
    as a DNA provirus.
    Packaging cell line: Certain cell lines provide the packaging signal in trans. A helper virus can
    increase the risk due to recombination and reconstitution of helper virus resulting in contamination.
    What is the potential for generation of replication competent virus from vectors by recombination?
    Recombination may occur (1) between endogenous murine retroviral sequences in the packaging
    cells line and (2) between vector coding sequences and the helper packaging sequences to generate
    infectious viral particles.
    Envelope protein in the packaging system: The packaging cell line determines if the vector is
    ecotropic, xenotropic, or amphotropic.
    General containment considerations:
    BL-1 is appropriate when ecotropic or the native envelope is used and it has been shown to be
    replication incompetent. BL-2 is appropriate for many constructs, while higher levels may be
    required depending upon the construct. During production phase of the vector, BL-2 is appropriate
    until replication incompetence is demonstrated.
    Animal Research Considerations:
    Housing and husbandry: ABL-1 Contact with feces or urine from infected animals for 72 hours
    post infection. Contact with tissues and body fluids of infected animals.
    Vector Administration: ABL-1 or ABL-2 depending on the construct/pseudotyping
    Disinfection: 10% bleach (recommended)
    Contact the Division of Research Safety, Biological Safety Section (333-2755 or via e-mail at or visit our web site:
    Other Biosafety Fact Sheets are available from the Biological Safety Section at our web site:
  2. Daffodil

    Daffodil Senior Member

    i think maloney MLV is the mouse one that is closest to ours in similarity, isnt it?
  3. Mya Symons

    Mya Symons Mya Symons

    I don't know. However, I think that if they have been experimenting with these mouse retroviruses since the early 80's or before, wouldn't there be even a greater chance that something similar and contagious got out of the labs before the 1990's? (there are journal articles mentioning Maloney Virus from 1980 on the internet.)

    If I remember right, when they first discovered HIV came from Monkies (SIV), scientists thought the reason it was contagious to humans was because the monkies that carried it were a close genetic match to humans. If that was the belief, why would they need to be careful with a mouse retrovirus?
  4. Daffodil

    Daffodil Senior Member

    i think anything can mutate in a way as to become infectious to humans, over time.....but i'm just guessing

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