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Related post: protein of approximately 33 kDa. (Dwyer and Mann).
Further studies on leishmanial secretory acid phosphatase (SAcP). Leishmanial SAcP was
shown to possess a common antigenic epitope with parasite lipophosphoglycan (LPG), a
functionally active surface molecule involved in serum complement interaction with the
parasite. Both SAcP and LPG were shown to be processed in the Golgi compartment of the
organism. (Dwyer). DNA probes have been developed to identify SAcP genes and genes
responsible for LPG (Dwyer, Mallinson and Mann).
LEISHMANIAL The role of LPG in developmental biology of leishmania.
CELL BIOLOGY Attention continues to be focused upon the major surface
AND IMMUNOLOGY molecule, lipophosphoglycan (LPG) on flagellate forms
of leishmania. The LPG undergoes chemical and structural changes
as the parasite develops to the infective stage so that it is resistant to serum complement.
However, the developmental biology of New World leishmanial species appears to be different
from L. donovani, L. major and L. tropica of the Old World. Although the LPG from New
World species exhibit chemical alterations as they develop from log to stationary phase, the
molecule does not appear to elongate, and the metacyclic promastigotes continue to be
susceptible to serum complement (Sacks, Brodin, Pimenta and Turco of University of
Kentucky). A direct agglutination test for Kala-azar with L. donovani promastigotes was found
to require a mutant strain lacking LPG. The implications of this and utilization of the test is
being investigated further (Sacks and Karp).
T-cell responses in human leishmaniasis. Further experience has been obtained with the
system for examining T-lymphocyte responses after interaction with leishmania infected
autologous macrophages or monocytes. The lymphocytes from 8 patients with Old World
cutaneous L. major infections showed strong proliferative responses under these conditions.
Cytokines (INF-gamma, IL-4, and GMCFS) produced by unfractionated or subpopulations of
T-cells were also assayed in this system. New World patients with cutaneous leishmaniasis
seem to be less dependent than Old World cases on CD4 cells for cytokine production. cDNA
probes and reagents for cytokine assays have been developed and are now available for study
of patients with leishmaniasis (Sacks, Cooper, Karp and Neva).
Host-Parasite Relations Section
CYTOKINES AND Ablation of eosinophils with anti-IL-5 on S. japonicum
SCHISTO PATHOLOGY infected mice. Last year the effect of ablating
IN MICE eosinophil response in mice infected with S. mansoni by
administration of anti-IL-5 monoclonal antibody was reported. The
same procedure in mice infected with S. japonicum led to the same result— namely, no effect
on egg laying or egg excretion, and only a minimal decrease in size of egg granulomas in the
tissue (Xu and Cheever). Although not related to cytokines, another project has been
evaluating long term fecundity of single pair S. mansoni or S. Japonicum infections in mice.
Marked variation in numbers of eggs laid and numbers in the tissues was found with both
species. Fecundity of 5. mansoni does not change significantly up to 1 year after infection,
but it does decrease with S. japonicum, even though worms do not die (Cheever and Mosiman
MOLECULAR BIOLOGY Variation in the surface antigen. Studies have continued
AND IMMUNOLOGY on the very complicated issue of surface proteins
OF GIARDIA on the parasite which undergo antigenic variation as the
parasite is grown. The surface antigens are cysteine rich proteins
(CRP), so variation can be followed by evidence of transcription of the CRP gene and by
monoclonal antibody reactivity of the surface antigen. Changes in surface protein expression
by G. lamblia are accompanied by transcriptional activation of a new CRP gene, with
concomitant arrest of transcription of a previously expressed CRP gene (Nash, Mowatt, and
Rates of antigenic variation and susceptibility to intestinal proteases . In cloned
populations trophozoites with a new variant antigen were detected every 12-13 generations in
isolate WB, and in every 6.5 generations in isolate GS. (Nash, Banks and Ailing of OSD)
Isolates and variants of Giardia differed in their susceptibility to intestinal proteases— some
were totally resistant (Nash and Mowatt).
Physiology and Biochemistry Section
DNA of T. CRUZI Differences in DNA of T. cruzi .
Previous work has clearly established that Buy Trandate different strains
of T. cruzi may have quite different DNA content, and that this
variability in DNA content per cell can be present among different clones of the same strain.
Now marked interdevelopmental stage differences have also been found at the Trandate 200 Mg DNA level.
In some clones the DNA per cell of epimastigotes may be the same as in trypomastigotes, but
in other clones the DNA of these stages may be quite disparate. A second instance was found
in which a cloned stock of Y strain T. cruzi developed a mixed population based upon DNA
content of the cell. Environmental stress, such as change in temperature or nutrients, can also
result in changes in parasite DNA (Dvorak and Nozaki). The methods used to study DNA
content rely heavily upon flow cytometry instrumentation. In order Trandate Tablets to increase sensitivity of
the instrumentation it was necessary to redesign hardware and develop new analytical software
(Dvorak of LPD, Banks of OSD and Mudd of BEB).
Anti-trvpanosomal factor. Continued studies on purification of the anti-trypanosomal
factor from Pseudomonas using HPLC and NMR disclosed that purified samples were
contaminated with Tris buffer. Removal of the Trandate 100mg Tris has facilitated the purification process
(Mercado with collaboration of Fales of NHLBI and Hammer of Georgetown Univ.).
Parasite Growth and Differentiation Section
MOLECULAR BIOLOGY "Riboprinting" differentiates Entameba species.
AND BIOCHEMISTRY By PCR amplification of a small subunit ribosomal
OF AMEBAE RNA gene, and preparation of RFLPs from the
amplified DNA, it is possible to rapidly identify and differentiate
species of Entameba. When this technique of riboprinting was applied to the controversial
issue of pathogenic (P) and non-pathogenic (NP) strains of E. hystolytica it was found that the
organism is one species with two genetically distinct but Labetalol Trandate interconvertible forms. In other
words, riboprints from NP strains are different from P strains, but isoenzyme conversion from
NP to P or vice versa does not change the ribosomal RNA gene patterns. The E. histolytica-
like amebae that survive hypotonic media and grow at room temperature were identified by
riboprinting as a sub-group of the genus E. moshkovski, a species considered to be free-living.
Finally, strains of Entameba recovered from the uterus of IUD users were identified as E.
gingivalis, a parasite of the oral cavity. (Diamond, Clark and Mirelman of Israel). By using
monoclonal and polyclonal antibodies vs. various surface components of E. histolytica,
evidence has been found suggesting that bacteria can modulate surface antigens of amebae. (S.
and A. Bhattacharya, Diamond, and Mirelman of Israel).
Respiratory metabolism of Entameba species. An unusual stimulatory effect of Mn++ ion
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