home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Education
/
collectionofeducationcarat1997.iso
/
HEALTH
/
MED9605D.ZIP
/
M9650928.TXT
< prev
next >
Wrap
Text File
|
1996-03-30
|
3KB
|
42 lines
Document 0928
DOCN M9650928
TI Ex vivo evidence for PGE2 and LTB4 involvement in cutaneous
leishmaniasis: relation with infection status and cytokine production.
DT 9505
AU Milano S; Arcoleo F; Dieli M; D'Agostino R; De Nucci G; D'Agostino P;
Cillari E; Institute of General Pathology, University of Palermo, Italy.
SO Parasitology. 1996 Jan;112 ( Pt 1):13-9. Unique Identifier : AIDSLINE
MED/96155201
AB Ex vivo culture of spleen cells from BALB/c mice infected with 2 x 10(6)
Leishmania major (L. major) promastigotes were cultured with
ConcanavalinA (ConA) or leishmanial antigen (L. Ag) and tested for
prostaglandin E2 (PGE2) and for leukotriene B4 (LTB4), in order to study
their involvement in the evolution of cutaneous leishmaniasis and the
connexion with lymphokine-mediated responses. The data were compared
with those obtained in BALB/c mice protected against L. major by
sublethal irradiation (550 rad; cured mice). In the unprotected BALB/c
mice the levels of PGE2 that were responsible for the depression of
interferon-gamma (IFN-gamma) and tumour necrosis factor-alpha (TNF
alpha) Th1-associated cytokines and for the relative increase in the
interleukin-4 (IL-4) became higher and higher as the lesion progressed.
On the contrary, the cured mice produced levels of PGE2 similar to
normal uninfected controls, high levels of TNF alpha and IFN-gamma and
low levels of IL-4. Elevated levels of LTB4 were detected in the early
stage of infection in the unprotected mice compared to cured ones, a
sign of more intense inflammation and a stimulus for the recruitment of
inflammatory cells. The observation that exogenous LTB4 was able to
enhance in vitro both Th1 cytokines in cured mice and Th2 cytokines in
unprotected ones suggests that LTB4 could act in the recruitment of the
T cells already committed to Th1 or Th2 phenotype.
DE Animal Cells, Cultured Dinoprostone/*METABOLISM Female Interferon
Type II/METABOLISM Interleukin-4/METABOLISM Leishmania
major/*IMMUNOLOGY Leishmaniasis, Cutaneous/*IMMUNOLOGY/PATHOLOGY
Leukotriene B4/*METABOLISM/PHARMACOLOGY Mice Mice, Inbred BALB C
Spleen/CYTOLOGY/*METABOLISM Support, Non-U.S. Gov't Th1
Cells/IMMUNOLOGY Th2 Cells/IMMUNOLOGY Tumor Necrosis Factor/METABOLISM
Whole-Body Irradiation JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).