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M9650453.TXT
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1996-03-09
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Document 0453
DOCN M9650453
TI Antigenic differences associated with genetically distinct Pneumocystis
carinii from rats.
DT 9605
AU Vasquez J; Smulian AG; Linke MJ; Cushion MT; Department of Internal
Medicine, James Quillen College of; Medicine, Johnson City, Tennessee
37614-0622, USA.
SO Infect Immun. 1996 Jan;64(1):290-7. Unique Identifier : AIDSLINE
MED/96110946
AB Pneumocystis carinii is a family of organisms found in a wide variety of
mammalian lungs. In immunocompromised hosts, the organisms are able to
produce an oftentimes fatal pneumonia. The existence of distinct types
of Pneumocystis populations is strongly supported by antigenic and
genetic evidence. In the present study, we assessed the antigenic
profiles of two genetically distinct Pneumocystis carinii populations,
P. carinii f. sp. carinii and P. carinii f. sp. ratti, as well as two
types of P. carinii f. sp. carinii defined by electrophoretic
karyotyping (forms 1 and 2). The separated and blotted proteins of the
organism preparations were probed with four monoclonal antibodies (MAbs)
generated to the major surface glycoproteins of rat-derived P. carinii,
one anti-human P. carinii MAb, and two polyclonal antisera made with
rat-derived P. carinii as the immunogen. Differences in reactivities
between the P. carinii f. sp. carinii and P. carinii f. sp. ratti
preparations were detected with two of the MAbs, and both of the rat P.
carinii polyclonal antisera in the 45- to 55-kDa molecular mass range,
but not with the human P. carinii MAb. The reactivities of the 16 P.
carinii f. sp. carinii preparations were the same with two exceptions.
Two preparations of form 1 showed strong reactivity with the anti-MSG
MAb RA-C11. The ratios of cyst forms to trophic forms evaluated by
microscopy were not associated with any of the differences observed in
the antigenic profiles. The antigenic differences between P. carinii f.
sp. carinii and P. carinii f. sp. ratti are consistent with the
distinction of these two populations made by molecular genetic
techniques, while the two differences detected among the P. carinii f.
sp. carinii preparations suggest the organism may be able to modulate
antigenic epitopes. The use of immunoblotting to differentiate infecting
organism populations and assess antigenic modulation holds promise for
future epidemiologic studies.
DE Acquired Immunodeficiency Syndrome/MICROBIOLOGY Animal Antibodies,
Fungal Antibodies, Monoclonal Antigens, Fungal/*IMMUNOLOGY Blotting,
Southern Cell Differentiation Colony Count, Microbial Comparative
Study Fungal Proteins/IMMUNOLOGY Human Immunoblotting
Immunocompromised Host Membrane Glycoproteins/IMMUNOLOGY Pneumocystis
carinii/CLASSIFICATION/*GENETICS/*IMMUNOLOGY Rats Rats,
Sprague-Dawley/*MICROBIOLOGY Species Specificity Support, U.S. Gov't,
P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).