home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Mission 3
/
Mission 3.zip
/
Mission 3.iso
/
demovers
/
review
/
demo_db
/
import
/
lif.imp
< prev
next >
Wrap
Text File
|
1996-01-15
|
8KB
|
174 lines
REVIEW
TI - Mutations in the myelin proteolipid protein gene alter
oligodendrocyte gene expression in jimpy and jimpymsd mice
AU - Macklin, WB
AU - Gardinier, MV
AU - Obeso, ZO
AU - King, KD
AU - Wight, PA
JC - JONRA9
JS - J.Neurochem.
JN - Journal of Neurochemistry
JB - 56(1)
JP - 163-71
YE - 1991
TP - Artikel
LA - Englisch
ST - Import
AB - The mouse myelin proteolipid protein (PLP) gene has been
studied in normal and jimpymsd mice. Potential upstream
regulatory regions of the normal gene have been cloned and
mapped, but when these regions were studied in jimpymsd mice by
Southern blots, no alterations were observed, relative to the
normal gene. To assess whether the low ratio of PLP to DM20
proteins in this mutant reflected an altered PLP/DM20 ratio
mRNAs, S1 nuclease analyses were undertaken, which demonstrated
that at all ages studied in both jimpy and jimpymsd mice, PLP
mRNA was elevated above DM20 mRNA. When exon 3 (the site of the
alternative splice signal for DM20 mRNA) of the jimpymsd PLP
gene was sequenced, no mutation was identified. The
transcription of the PLP gene in normal and mutant animals was
studied. The transcription rate increases in normal animals with
development, and in very young jimpymsd or jimpy mice, the
transcription rate of the PLP gene was close to that of age-
matched normal animals. However, by 10 days of age, the
transcription rate of this gene in both mutants was
significantly below that of age-matched controls. The
transcription rate of the myelin basic protein (MBP) gene was
also reduced, indicating that expression of both genes is
affected by this mutation. In contrast, the transcription rate
of the glycerol phosphate dehydrogenase (GPDH) gene, an early
marker of oligodendrocytes, is equal to or greater than normal
in both mutants. We have confirmed an earlier report of a point
mutation in exon 6 of the jimpymsd PLP gene, which converts an
alanine to a valine.(ABSTRACT TRUNCATED AT 250 WORDS)
SC -
DA - 15.01.1996
TI - Parental MHC molecule haplotype expression in (SJL/J x SWR)
F1 mice with acute experimental allergic encephalomyelitis
induced with two different synthetic peptides of myelin
proteolipid protein
AU - Sobel, RA
AU - Tuohy, VK
AU - Lees, MB
JC - JOIMA3
JS - J.Immunol.
JN - Journal of Immunology
JB - 146(2)
JP - 543-9
YE - 1991
TP - Artikel
LA - Englisch
ST - Import
AB - To determine if the Ag that induces an autoimmune disease
influences parental MHC haplotype molecule expression in situ in
MHC heterozygotes, acute experimental allergic encephalomyelitis
(EAE) was induced with different encephalitogenic peptides in
(SJL/J x SWR)F1 mice. The mice were sensitized with either a
synthetic peptide corresponding to mouse myelin proteolipid
protein (PLP) residues 103-116 YKTTICGKGLSATV which induces EAE
in SWR (H-2q), but not SJL/J (H-2s) mice or a synthetic peptide
corresponding to PLP residues 139-151 HCLGKWLGHPDKF which is
encephalitogenic in SJL/J but not SWR mice. Mice were killed
when they were moribund or at 30 days after sensitization.
Twelve of 18 F1 mice given PLP peptide 103-116 and 12 of 17 mice
given PLP peptide 139-151 developed EAE within 2 to 3 wk after
sensitization. Cryostat sections of brain samples from F1 and
parental mice were immunostained with a panel of mAb identifying
H-2s and H-2q class I and II MHC molecules. In brains of
controls, class I MHC molecules were expressed on choroid plexus,
endothelial cells, and microglia whereas class II MHC molecules
were absent. In EAE lesions, class I and II MHC molecules were
present on inflammatory and parenchymal cells, but the degree of
parental haplotype molecule expression did not vary with the
different peptide Ag tested. Thus, in (SJL/J x SWR)F1 mice,
myelin PLP peptides 103-116 and 139-151 are co-dominant Ag with
respect to clinical and histologic disease and parental
haplotype MHC molecule expression. We propose a unifying
hypothesis consistent with these results and previous
observations of differential Ia expression in (responder x non-
responder)F1 guinea pigs. We suggest that MHC molecules may bind
locally derived peptide Ag in inflammatory sites and that these
interactions influence levels of MHC haplotype molecules on APC
SC -
DA - 15.01.1996
TI - Physiologic properties of myelin proteins revealed by their
expression in nonglial cells
AU - Colman, DR
AU - Staugaitis, SM
AU - D'Urso, D
AU - Sinoway, MP
AU - Allinquant, B
AU - Bernier, L
AU - Mentaberry, A
AU - Stempak, JG
AU - Brophy, PJ
JC - ANNYY9
JS - Ann.N.Y.Acad.Sci.
JN - Annals of the New York Academy of Sciences
JB - 605
JP - 294-301
YE - 1990
TP - Artikel
LA - Englisch
ST - Import
AB - The transfection paradigm described herein can be used to
investigate the functional properties of individual nervous
system proteins in ways that have not been explored before. In
particular, observations on the "structural" proteins of myelin
are being made that have already yielded certain unique insights
into the physiologic properties of these polypeptides. The ease
with which site-directed mutagenesis procedures can be applied
to these systems should eventually enable us to define with
great precision the "functional domains" within each myelin
protein
SC -
DA - 15.01.1996
TI - Posttranscriptional events in the expression of myelin
protein genes
AU - Campagnoni, AT
AU - Verdi, JM
AU - Verity, AN
AU - Amur Umarjee, S
JC - ANNYY9
JS - Ann.N.Y.Acad.Sci.
JN - Annals of the New York Academy of Sciences
JB - 605
JP - 270-9
YE - 1990
TP - Artikel
LA - Englisch
ST - Import
AB - A number of posttranscriptional events may be involved in
regulating the expression of the myelin protein genes. One such
event in the expression of the myelin basic protein (MBP) gene
is the translocation of MBP mRNAs from oligodendrocyte cell
bodies to their processes. This translocation can be observed in
vivo and in primary mixed glial cell cultures. In jimpy brains
the translocation of MBP mRNA appears to be disrupted, so that
most of the mRNA remains associated with cell bodies. This
apparent failure of translocation may account for the lack of
incorporation of newly synthesized MBP into jimpy myelin. In
quaking myelin, where MBP assembly is also defective,
translocation appears to be normal, suggesting that
incorporation of MBP into the membrane also is regulated
posttranslationally. We have identified a number of the
structural features of MBP mRNAs that influence the efficiencies
with which they are translated and may be involved in regulating
the levels of individual MBP produced. We also found that
glucocorticoids stimulate the translation of MBP and PLP mRNAs
and inhibit the translation of CNP mRNA in cell-free systems.
Our results suggest that this pattern of translational
regulation may be physiologically meaningful, especially during
maturation of myelin. The mechanism by which the steroids
modulate translation of these messages appears to be novel.
Analysis of the effect of steroids on cRNAs produced from
engineered MBP cDNA constructs has permitted the identification
of a nine nucleotide element involved in this steroid modulation
within the 5' untranslated region of the MBP mRNA