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Molecular Oncology, Markers, Clinical Correlates |
Niwa Institute for Immunology, Tosashimizu 787-0303 [Y. N., H. S.]; Department of Dermatology, Kansai Medical University, Moriguchi 570-8507 [H. A.]; Gynecological Department, Hyogo Prefectural Amagasaki Hospital, Amagasaki 660-0828 [H. N.]; Department of Clinical and Laboratory Medicine, Yamanashi Medical University, Yamanashi 409-3898 [Y. O.]; and Research and Development, Sumitomo Metal Bio-Science, Inc., Sagamihara 229-0004 [A. A.], Japan
| ABSTRACT |
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, interleukin (IL)-2, IL-4, IL-5, and IL-10, along with
serum IgE levels and blood eosinophils. Plasma RANTES levels were found
to be higher in order of stages IV, III, II, and I of each cancer
except for stage I. A marked increase in plasma RANTES level (>10,000
pg/ml) was found in 27% of patients with progressive malignancy but in
none of those in clinical remission. The platelet RANTES content was
correspondingly decreased in those patients with increased plasma
RANTES levels. ß-TG showed a pattern similar to RANTES both in plasma
and platelets, but with much less dramatic differences between patients
with different stages of disease. Other allergic parameters, IgE,
eosinophils and plasma IFN-
, IL-2, -5, and -10, were not elevated in
the cancer patients. The RANTES content was markedly elevated in the
primary tumor and metastatic lesions (lymph node or skin) from all of
the patients with breast or cervical cancer, irrespective of the plasma
RANTES level. In addition, in patients with progressive breast or
cervical cancer, but not in patients thought to be cured of these
tumors, the RANTES content was markedly increased in clinically normal
tissue taken from near the operative site several months
postoperatively, as well as in intact skin or mucosa taken
perioperatively near the excised tumor. This study suggests an
as-yet-undefined but important role played by RANTES in carcinogenesis,
as well as the possibility that a RANTES assay in tissue surrounding a
tumor or postoperative tumor site may help predict prognosis in these
patients. | INTRODUCTION |
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Recently, it has been reported that platelets are also an important
source of RANTES, and that platelet-released RANTES may play a role
in allergic reaction (1, 2, 3, 4, 5, 6)
. In this study, the levels of
RANTES and another platelet-produced chemokine,
ß-TG,2
and the levels of IFN-
, IL-2, -4, -5, and -10 which are known to be
produced by Th1 and Th2 T lymphocytes and increased in RANTES-relating
allergic inflammatory process (5
, 6
, 19, 20, 21, 22, 23, 24, 25, 26, 27)
were assessed
in the patients with various malignancies. The levels of
(IL-4-stimulated) IgE and blood (IL-5-stimulated) eosinophils, both of
which increase with the elevation in RANTES in allergic reactions, were
also assessed. RANTES and ß-TG content of platelets was also assayed,
and RANTES was also measured in primary and metastatic tumors, and in
clinically uninvolved tissue taken peri- or postoperatively. The
results indicate a strong correlation between elevated tissue RANTES
levels and progressive malignancy.
| PATIENTS AND METHODS |
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Because of the potential effect of chemotherapy or radiation on these
parameters, only patients who were treated with natural products were
studied, and patients with thrombocytopenia were excluded. Patients
were tested for plasma levels of RANTES, ß-TG (another chemokine
produced by platelets), IFN-
, IL-2, -4, -5, -8, and -10, serum IgE,
and blood eosinophils. Platelet RANTES and ß-TG content was also
measured.
RANTES levels were also assayed in tumor tissue. This included primary tumors and/or tumors metastatic to lymph nodes or skin from 22 breast cancer patients. In an additional 18 breast cancer patients, 8 with progressive disease and 10 in remission, RANTES content was measured in skin biopsies taken near the operative site from 13 months after tumor excision (postoperative skin). RANTES content was examined in resected tumor from 17 cervical cancer patients, including 10 with invasive disease and 7 with CIS. In addition, RANTES content was determined in the cervical mucosa near the operative site from six patients in remission and six patients with progressive malignancy, as assessed by rectal and vaginal examination and/or biopsy. For control values, plasma RANTES and skin were measured in 12 healthy controls and in biopsies of normal cervical mucosa from 11 women attending a gynecological clinic for routine pap test. Informed consent was obtained from each subject.
In the plasma RANTES assay, citrated blood was drawn from each subject. RANTES levels were assessed by ELISA (28) , as follows. One hundred µl of a 1:10 dilution of plasma were added to microtiter wells coated with a mouse monoclonal antibody to human RANTES. After mixing, the plate was incubated for 2 h at 25°C; the wells were then washed six times with 300 µl of 0.9% NaCl and 0.05% Tween 20, and then 100 µl alkaline phosphatase-labeled RANTES monoclonal antibody were added to each well, and plate was incubated for 1 h at 25°C. After another six washings, 100 µl of paranitrophenylphosphate (final concentration, 5.4 mM) were added, and the reaction was terminated after 1 h at 25°C by the addition of 50 µl of EDTA. Absorbance was measured at 450 and 595 nm by spectrophotometer (Hitachi, U-3200, Tokyo, Japan), and concentration was determined from a standard calibration curve.
For tissue RANTES assay, biopsy specimens, lymph node, skin, or mucosa, from the tumor were homogenized in a 10-fold (wt/vol) volume of PBS with 0.1% Triton X-100 in a homogenizer (KONTES; Scientific Glassware Instruments, Vineland, New Jersey). After centrifugation of the homogenates at 5500 x g for 10 min, supernatants were assayed for RANTES as described above for plasma.
Plasma IFN-
, IL-2, 4, 5, 8, and 10, and IgE were assessed by ELISA
(29, 30, 31)
as described elsewhere (32)
, and
eosinophils were assessed by routine clinical laboratory methods.
The results were expressed as the mean ± SD of replicate assays. For statistical analysis, the Student t test was applied for each plasma or blood assay level for comparisons between patients with progressive disease, patients in remission, and healthy volunteers, and for RANTES content between tumor or metastatic lesion and improved or normal skin or mucosa.
| RESULTS |
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Interestingly, the other parameters that were measured, including IgE,
eosinophils, IFN-
, and IL-2, -4, -5, -8, and -10, were not
significantly elevated in the cancer patients in whom plasma RANTES
levels were found to be increased, nor in the cancer patients as a
whole, compared with the healthy controls (data not shown).
RANTES Content in Tissues.
The mean RANTES content of primary or metastatic tumor from patients
with breast or cervical cancer was 50-fold greater than that of normal
skin of healthy volunteers (breast cancer, P < 0.0001;
invasive cervical cancer, P < 0.00001) and at least
5-fold greater than that of postoperative skin (as defined in
"Patients and Methods") or normal skin or mucosa taken at surgery
near the site of the original tumor (breast cancer, P < 0.001; invasive cervical cancer, P < 0.01; Table 2
). Both invasive cervical cancer and CIS of the cervix showed markedly
elevated RANTES levels, although somewhat lower than in primary breast
tumors. An increased RANTES content was found in all of the breast and
cervical tumors examined, although only one-fourth of these patients
showed elevated plasma RANTES levels. The RANTES content in the
clinically normal skin or mucosa, taken perioperatively near original
tumor or metastatic lesions from the patients with progression,
relapse, and/or metastasis, was also markedly (710 times)
increased compared with those from the biopsy specimens from patients
in remission and from healthy controls (breast cancer,
P < 0.001; invasive cervical cancer, P < 0.0001; Table 2
), whereas there was no significant difference in the
RANTES content of specimens from the latter two groups.
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| DISCUSSION |
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Although RANTES is known to be released by a variety of cells, including activated T lymphocytes, monocytes, and fibroblasts, there is a suggestion that the elevated plasma RANTES levels seen in some of the patients in this study were derived from platelets. RANTES is known to be produced by platelets, with strong effects on allergic processes (1, 2, 3, 4, 5, 6) . Moreover, the platelet-secreted chemokine ß-TG was also increased in the plasma of the patients with elevated plasma RANTES levels, and these same patients had decreased RANTES and ß-TG content in platelets. We have previously observed a similar pattern in patients with severe atopic dermatitis (18) . From the above findings, it is not unlikely that elevated plasma RANTES in the patients with severe atopic dermatitis and malignancies derives from platelets.
The patients with elevated RANTES levels in plasma had normal blood
levels of IgE, eosinophils, IFN-
, and IL-2, -4, -5, and -10. The
stimulus for RANTES secretion in association with malignancy is thus
not clear.
Regarding the literature on the association of chemokines with
malignancy, Iantorno et al. (35)
reported that
monocytes from the patients with bladder carcinoma undergoing
BCG immunotherapy were stimulated in the presence of the
ß-chemokine MCP-1. Youngs et al. (36)
reported that ß-chemokines induced migrational responses in human
breast carcinoma cells. Expression of RANTES and of MIP-1
and ß
in ovarian cancer (37)
and the loss of tumorigenicity
in vivo by RANTES secretion by gene-modified tumor cells
(38)
have also been demonstrated. However, there are no
previous reports of RANTES levels in plasma, tumor, or perioperative
tissue in cancer patients, nor has the correlation between RANTES
levels and cancer disease course been previously described.
It is noteworthy that RANTES content was markedly increased in both perioperative and postoperative skin from patients with progressive breast or cervical cancer, whereas this was not the case in any of the patients thought to be cured or in remission. The RANTES content of peri- or postoperative biopsy sites would thus appear to have a prognostic value with regard to subsequent tumor relapse. The correlation of elevated RANTES content in diseased tissue seems to be much stronger than the correlation of elevated plasma RANTES, which suggests some fundamental role for RANTES in the lesions.
| FOOTNOTES |
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1 To whom requests for reprints should be
addressed, at Niwa Institute for Immunology, 4-4 Asahimachi,
Tosashimizu 787-0303, Japan. Phone: 81-8808-2-2511; Fax:
81-8808-2-4925; E-mail: yniwa{at}lime.ocn.ne.jp ![]()
2 The abbreviations used are: ß-TG,
ß-thromboglobulin; IL, interleukin; CIS, carcinoma in
situ. ![]()
Received 6/19/00; revised 11/17/00; accepted 11/20/00.
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B potently up-regulates the promoter activity of RANTES, a chemokine that blocks HIV infection.. J. Immunol., 158: 3483-3491, 1997.[Abstract]
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