HHV6 in MS & CFS
2008-02-29 11:39:25Ablashi et al provide further documentation of HHV6 in MS and CFS (1);
and their study is complementary to the recent findings of Knox,
Carrigan, et al (2). Together, when these studies are joined with V
Singh's HHV6 and MV findings (3), one wonders when neurologists and
psychologists will begin to request titer determinations and peripheral
viral-load quantifications in ASD kids -- especially since anti-HHV6
pharmaceuticals are available.
In regard to VK's study, I wonder if the "not quite significant"
difference between titers of controls and autistic kids arose because a
younger population would have more kids whose HHV6 infection was
somewhat recent. Regardless, although titers can provide a clue,
quantitation of viral load and of viral-activation status (2) seems a
more important determination.
Teresa
J Clin Virol 2000 May;16(3):179-91
Frequent HHV-6 reactivation in multiple sclerosis (MS) and chronic
fatigue
syndrome (CFS) patients.
Ablashi DV et al.
BACKGROUND: HHV-6 is a ubiquitous virus and its infection usually occurs
in
childhood and then becomes a latent infection. HHV-6 reactivation has
been shown
to play a role in the pathogenesis of AIDS and several other diseases.
OBJECTIVES: To determine what role HHV-6 infection or reactivation plays
in the
pathogenesis of multiple sclerosis (MS) and chronic fatigue syndrome
(CFS).
RESULTS: Twenty-one MS and 35 CFS patients were studied and followed
clinically.
In these patients, we measured HHV-6 IgG and IgM antibody levels and
also
analyzed their peripheral blood mononuclear cells (PBMCs) for the
presence of
HHV-6, using a short term culture assay. In both MS and CFS patients, we
found
higher levels of HHV-6 IgM antibody and elevated levels of IgG antibody
when
compared to healthy controls. Seventy percent of the MS patients studied
contained IgM antibodies for HHV-6 late antigens (capsid), while only
15% of the
healthy donors (HD) and 20% of the patients with other neurological
disorders
(OND) had HHV-6 IgM antibodies. Higher frequency of IgM antibody was
also
detected in CFS patients (57.1%) compared to HD (16%). Moreover, 54% of
CFS
patients exhibited antibody to HHV-6 early protein (p41/38) compared to
only
8.0% of the HD. Elevated IgG antibody titers were detected in both the
MS and
the CFS patients. PBMCs from MS, CFS and HD were analyzed in a short
term
culture assay in order to detect HHV-6 antigen expressing cells and to
characterize the viral isolates obtained as either Variant A or B.
Fifty-four
percent of MS patients contained HHV-6 early and late antigen producing
cells
and 87% of HHV-6 isolates were Variant B. Isolates from CFS, patients
were
predominately Variant A (70%) and isolates from HD were predominately
Variant B
(67%). Moreover, one isolate from OND was also Variant B. Persistent
HHV-6
infection was found in two CFS patients over a period of 2.5 years and
HHV-6
specific cellular immune responses were detected in PBMCs from ten CFS
patients.
CONCLUSION: In both MS and CFS patients, we found increased levels of
HHV-6
antibody and HHV-6 DNA. A decrease in cellular immune responses was also
detected in CFS patients. These data suggest that HHV-6 reactivation
plays a
role in the pathogenesis of these disorders.
2: Clin Infect Dis 2000 Oct;31(4):894-903
Human herpesvirus 6 and multiple sclerosis: systemic active infections
in
patients with early disease.
Knox KK, Brewer JH, Henry JM, Harrington DJ, Carrigan DR
By means of immunohistochemical staining, cells actively infected with
human herpesvirus 6 (HHV-6) were found in central nervous system tissues
from 8 (73%) of 11 patients with definite multiple sclerosis (MS).
Interestingly, 17 (90%) of 19 tissue sections showing active
demyelination were positive for HHV-6-infected cells compared with only
3 (13%) of 23 tissue sections free of active disease
(P<.0001).
Central nervous system tissues from 2 of 28 normal persons and
patients with other inflammatory demyelinative diseases were positive
for HHV-6-infected cells (P<.0001), and the 2 positive cases were
diagnosed as having HHV-6 leukoencephalitis.
By use of a rapid culture assay, blood samplesfrom 22 (54%) of 41
patients with definite MS were found to contain active HHV-6 infections,
compared with 0 of 61 normal controls (P<.0001).
No significant difference was found between HHV-6 viremia-positive
and HHV-6 viremia-negative MS patients with respect to type of disease
(relapsing/remitting or
progressive). In contrast, patients with active HHV-6 viremia were
significantly
younger and had shorter durations of disease than did HHV-6
viremia-negative
patients.
3. Clin Immunol Immunopathol 1998 Oct;89(1):105-8
Serological association of measles virus and human herpesvirus-6 with
brain
autoantibodies in autism.
Singh VK, Lin SX, Yang VC
College of Pharmacy, University of Michigan, Ann Arbor, Michigan,
48109-1065,
USA.
Considering an autoimmunity and autism connection, brain autoantibodies
to myelin basic protein (anti-MBP) and neuron-axon filament protein
(anti-NAFP) have been found in autistic children. In this current study,
we examined associations between virus serology and autoantibody by
simultaneous analysis of measles virus antibody (measles-IgG), human
herpesvirus-6 antibody (HHV-6-IgG), anti-MBP, and anti-NAFP.
We found that measles-IgG and HHV-6-IgG titers were moderately
higher in autistic children but they did not significantly differ from
normal controls. Moreover, we found that a vast majority of virus
serology-positive autistic sera was also positive for brain
autoantibody:
(i) 90% of measles-IgG-positive autistic sera was also positive for
anti-MBP;
(ii) 73% of measles-IgG-positive autistic sera was also positive for
anti-NAFP;
(iii) 84% of HHV-6-IgG-positive autistic sera was also positive for
anti-MBP; and
(iv) 72% of HHV-6-IgG-positive autistic sera was also positive for
anti-NAFP.
This study is the first to report an association between virus
serology and brain
autoantibody in autism; it supports the hypothesis that a virus-induced
autoimmune response may play a causal role in autism.
ps: This post may be forwarded hither and yon.