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November. 1995. 585 expression on THE-i myelomonocytic cells by macrophage colony-stimulating factor in combination with interleron-y. Edward. S. Kimball,*.
Activation

of cytokine

production

and adhesion

molecule

expression on THE-i myelomonocytic cells by macrophage colony-stimulating factor in combination

with

interleron-y Edward

S. Kimball,*

*Oncology tDepartment School

Abstract:

ofMedicine,

THP-1

cultured

with

Elizabeth

and Endocrinology ofCell Biology,

Kovacs,t

Research, Neurobiology

Maywood,

leukemia

macrophage

cells

colony-stimulating

greater

have

been

This

enhanced

when

M-CSF

of

predicted cytokine

and

when M-CSF to the cells. human M-CSF.

amounts

production

IFN-ywere

blood

treated ofthe

taming M-CSF and IL- 1 and TNF-a. no effect of IFN-y

IFN-y inhibited Northern blotting alone on IL-1

production. observed

and TNF-a mRNA 6 h after treatment

1

IL-1 at 2 and

and

served

at

compared tured only augmented ments

higher

2

h after

with with

with

cytokines, in augmented .

monocytic M-CSF against

levels These

the production of studies revealed or TNF-ct mRNA expression with M-CSF

with

mRNA In addition

combinations cell surface

of IFN-yand expression

1 and vascular accompanied by that included aggregation, These phenotypic

in cytokine expression expression may be related

was

IFN-y

+

for suggest

resulting

of M-CSF

was or

expression was with IFN-y +

observed results

cytokine synthesis.

moleculeThis was

of IFN-? with fresh

expression

production

combinations

functional changes extensive homotypic like appearance. hancements molecule

mRNA

treatment

mRNA M-CSF.

cytokine

due to increased tokine protein

adhesion cute- 1

IL-1

or

with IFN-y + cultures con-

IFN-y + M-CSF. Higher TNF-a mRNA observed at 2 and 6 h after treatment M-CSF,

observed

simultaneously

h after addition were obtained

cells treatment

and Craig

R. Schneider* and University,

Stritch

and

that

Key 1

contained

Leukoc.

J.

Words:

tumor

and

58:

IFN-y

.

in combina-

585-594;

1995.

cell adhesion

interleukin-1

.

M-CSF Biol.

molecules interferon-gamma

cell

.

cytotoxicity . mRNA

. M-CSF

. ICAMTHP-1

.

. VCAM-1

necrosi.sfactor

TNF-cc than mechanisms. was

added

was added 24 Similar results

peripheral Cycloheximide

IL-13 and by additive

tures tion.

factor (M-CSF) or interferon-y (IFN-y) alone produce, at best, only low levels ofinterleukin-1 (IL-13) and tumor necrosis factor a (TNF-a). However, combinations of the two factors resulted in at least 3- to 20-fold would

Clark,*

Foundation, Spring House, Pennsylvania Burn and Schock Trauma Unit, Loyola

IllinoLc

myelomonocytic

either

M. Christina

Janssen Research and Anatomy,

ob-

M-CSF

cells cutthat the from

IFN-y

treatoccurs

and increased to up-regulating

cy-

INTRODUCTION Various

soluble

monocytic

factors

cell

subsequent

have

growth,

been

maturation,

acquisition

of properties

and bactericidal and tumoricidal vated macrophages. Macrophage (M-CSF),

also

termed

affecting

necrosis

CSF-1

{7]

secretion

factor

by mature

activation,

been

reported

motes the macrophages (MHC) (ICAM-1)

[6],

modulate

cytokine

with synthesis

[1],

is important

by actifactor

for prolifera-

marrow-derived mononuhas been reported to be tumoricidal activity [3, 4] (IL-i)

interferon-y

(IFN-y)

[5], [6],

tumor

and

IL-6

macrophages.

Monocyte also

like

of interleukin-1

(TNF)

to

differentiation,

toxicity exhibited colony-stimulating

tion and differentiation of bone clear phagocytes [2]. M-CSF capable of enhancing monocyte and

reported and

maturation, to be

and

a property

differentiation

of IFN-y,

have

which

pro-

maturation of peripheral blood monocytes to [8], induces major histocompatibility complex

class II and intercellular expression [9-1 1], amplifies

adhesion molecule 1 inflammatory cytok-

M-CSF resulted of intercellular cell adhesion morphological

moleand

plastic adherence, and a macrophagechanges and

en-

and cell surface to activation of

cells to become cytotoxic effectors by and IFN-y combinations. In vitro cytotoxicity A-375 melanoma cells was greatest for cut-

Abbreviations: nosorbent assay; antigen; adhesion

CHX, cycloheximide; ELISA, FITC, fluorescein isothiocyanate;

hPBL, human peripheral molecule 1; IFN-y,

IL-i,

interleukin-!;

LPS,

lipopolysaccharide;

MEM,

minimal

vascular

cell

Reprint Research,

LFA-i,

essential

requests: May

lymphocyte

medium; molecule Edward

Janssen

Received

blood leukocyte; interferon-y; IgGi,

M-CSF,

adhesion

Research 8,

1995;

enzyme-linked HLA, human

S.

TNF,

tumor

necrosis

very

Kimball,

Oncology

late

Spring

August

antigen

colony-stimulating

1; VLA-4, Foundation,

revised

ICAM-1, intercellular immunoglobulin Gi;

function-associated

macrophage

immuleukocyte

3,

factor; activation and

House, 1995;

1;

factor; VCAM-1, antigen

4.

Endocrinology PA

19477-0776.

accepted

August

4,

1995.

Journal

of

Leukocyte

Biology

Volume

58,

November

1995

585

me production

[8, 12],

and

promotes

TNF

over

the course

of 2 to 4 weeks

if IFN-y period.

is supplied to the Cytokine-induced

be hastened maturation

Culture Conditions

monocyte/macrophage

antimicrobial [13] and antitumor activity Human peripheral blood monocytes quire the ability to secrete constitutively [8].

This

acand

process

lEN+MCSE

can

U. 6000

z

cells throughout this macrophage activa-

I’-

E 4000

,

on monocytes [1 1, 15-18], and this has been shown to improve their in vitro antitumor effector cell properties [16, 19-21]. Numerous studies report the use of IFN-y as a agent or in combination [8, 22, 23], and others

phage

colony-stimulating

with involve

of the use of IFN-y absence of LPS, in

the

adhesion

of cytokine

production

and

6 hrs

cell

activation [23]. There are fewer reports in combination with M-CSF, but in the context

2000

lipopolysaccharide granulocyte-macro-

(GM-CSF)-induced

factor

Vehicle

0 lEN

tion, resulting in cytokine synthesis and tumoricidal activity, is now known to involve the expression of cell surface adhesion molecules. IFN-y, IL-1, and TNF-a can induce ICAM-1 and vascular cell adhesion molecule 1 (VCAM-1)

single (LPS)

.

8000

[14]. will gradually M-CSF, IL-i,

describe

leukemic IFN-yand production. man

experiments

THP-1

peripheral

blood

alone.

In vitro

target

cells

cells.

Flow

cytotoxicity

A-375

against

+ M-CSF alone.

2000

,-

-J

E

exam-

Dl

as a consequence of higher levels of ICAMafter IFN-y treatment

studies

revealed that IFN-y either single cytokine

than

studies

48 hrs

MCSF lEN IFN + MCSF

monocytic

cytometric

molecule expression treatment revealed than were obtained

24 hrs

Vehicle

cells as a model system in which combinations of M-CSF were shown to enhance IL-1 and TNF-a Similar experiments were carried out with hu-

ining adhesion IFN-y + M-CSF 1 and VCAM-1

tive

using

48

3000

molecule

expression.

We

hrs

24 hrs

0.

1000

melanoma

was

more

effec0

6 hrs

MATERIALS

AND

METHODS

Reagents Human

lL-1

kits

were

ELISA

kits

were

purchased

tissue

All

culture

pur(lsased

(strain

ci x

x 10

LPS U/tng were

i0

U/mg)

used for flow sources: CD-18, clone

W6/32

clone

antigen

Biosciences,

purchased Cambridge,

(CDS4),

(IgCl)-isotype

clone

1G11

clone

control,

IgG2a

late

IgG

la),

activa-

mouse

Isotype

anti-mouse

insmu-

control,

and

(Becton-Dicken-

CA).

Collection lin, cells

586

A-375

were

(Rockville, in RPMI

streptomycin, were

and

maintained

Journal

MD). 1640

of

obtained THP-1

medium 10%

from cells

fetal

bovine

Biology

American

tnaintained

supplemented

at subconfluent

Leukocyte

were

the

with serum

densities

Volume

Type

in

58,

Culture

x

at < 0.5

L-glutamine,

(RPM!

expression

either

production

one in

100

U/mI

medium

by TIIP-1

cells

showing

time

experiment

culture

supernatants

M-CSF,

1000

U/mI),

M-CSF cells

h,

as

U/ml

cultured course

of

a function

IFN-y,

medium). Dulbecco’s

November

106

penicilA-375 minimal

1995

(100

had

Pilot

M-CSF

of

or both.

and

100

production

when

by human

peripheral

hPBL

IL-i

manufacturer’s oritnetric

and

and

TNF-a

test

in

that

isolated

Endotoxin

levels

24,

blood

of

the

M-CSF production in 24-well diluted and THP-1

according

quantitated Walkersville,

or 1000

cytokine

penicillin, from

and

IFN-y

performed

ELISA, were

h after

6,

augmenting

heparinized

Bioproducts;

at

Cytokine

was

supernatants

and

24

recombinant

!FN-y.

L-glutamine,

After

combination

in

by commercial

(Whittaker/MA

added of either

human

in (1000

medium

sampled

M-CSF with

the

M-CSF.

was

the

(hPBLs)

with

quantitated

directions. LAL

than

leukocytes

supplemented were

M-CSF were

human

1 ml of freshly

and RPM!

For

cells/mI

106

IFN-y

concentrations

in combination blood

1640

cultures

M-CSF

of

with serum.

either

of IFN-y

cases,

effective

natural

used

containing

tomycin.

U/tnl

x

at 0.5

volume

lower

bovine

with

Supernatants

that less

from

equal

some

IFN-y.

revealed

different

RPM!

In

fetal

cultured

or a combination an

supplemented

10%

supplemented

with

considerably

IFN-y not

with

U/ml),

received

were

were

medium

refed

studies

formulation and

cells

supplements.

cells

U/ml

THP-1

were

appropriate

48 h.

high-glucose streptomycin,

or RPM!

24 the

(MEM)

penicillin, production

plates

and

cells/mi

medium

L-glutamine,

was

Cultures Tl-IP-1

essential

RPM!

WestCD1

very

(AMAC);

mouse

(FITC)-goat

with

cytokine

clone

(AMAC,

1 (LFA-1,

(AMAC);

HP2/1

(1-2

HLA-DR,

8H10

antigen

treatments

IL-!f3

from

M-

IFN-y

from the following MA); HLA-ABC,

clone

IL-iD

and Data

coli

Antibodies

IN);

and

TNF-a M-CSF.

serum,

human

human

Indianapolis,

ICAM-1

CDw49d),

Natural

International.

function-associated VCAM-1,

Jose,

Biosource

bovine

Escherichia

KS).

DIFCO.

TNF-

+

(Camarillo,

fetal

recombinant

studies were 31118 (Endogen,

n isothiocyanate

San

son,

from

(VLA-4,

Cl

fluorescei

from and

Human

International including

(Lenaxa,

activity)

purchased

Amersham.

Biosource

purchased

(AMAC); 4

noglobulin

was

cytometry clone

from

Biosciences

Biosciences);

25.3.1

tion

from

JRH

lymplmcyte

ME);

purchased components,

specific

(Harlan

(Harlan

B-Fl

brook,

were

media

from

011i:B4)

CSF

1. Enhanced !FN-y

TNF-a

a ELISA CA).

Fig. with

1:5 strepand to the

by MD)

a colthat

TABLE

The

1.

Combination

of M-CSF

and Experiment

!L-13

Vehicle

M-CSF

TNF-a 162 ±

1 2

1

3

16±8

335

±

9

41 ±

4

127±

IL-1 5±1

2

1

3 aIFNY of cultures. sensitivity samples.

19

that

!FN-y

+

(Table

±

6

7769

9 ±

0

1075

25

1115±

±

U/mI)

± 50

tion, had

no

detectable

M-CSF-treated

bacterial

supernatants

M-CSF-containing account

and

cultures.

for the

cellular

level

RNA

was

pared ized

effect and

testing. Miniinutn ± SD of triplicate

as

previously

isolated

obtained

from

from

Dr.

S.

Dr.

in

were

!FN-y

or

IFN-y

+

insufficient

to

guanidinium

et al.

cDNA

(Upjohn Sharp

Houston,

[24].

Blots for

Kalamazoo,

Dohme

+

IFN-?,

pre-

were

hybrid-

human

IL-1

MI)

Research

production numbers

TX)

were

and

during

TNF-cx

cells 1000

fluorescent for

stained

Data

and

The

were

control for 24 an

medium, All

The

antibody, and on

then

100

buffers

cells at

fixed

were

again,

1%

an

M-CSF, which

ratio

radioactivity

a Skatron

calculated perimental

from cpm

x 100. All

samples

cell -

the following spontaneous were

into system.

specific

formula: specific cptn)/(maximuin

tested

were

main-

cells

were

added

an

supernatants

The

% cptn

cells

Table

contained

!FN-y,

target

Following the

effector

which

+

A-375

of 20:1.

released harvesting

THP-1

cultures,

or M-CSF

51Cr-labeled

effector-to-target

dishes.

pJ. The

!FN-y,

rio meas-

100 with

with

LPS

560

supernatants the increased

(i.e., IL-1

after

an amount M-CSF and 2 pg/ml). and TNF-a


1

C.) 10 U U

0. U)

0 4

3

2

1

Experiment 6. Improved

Fig.

cocultured experiments

cell-mediated

THP-1

with

control

medium

performed

The

in

increased

creted

combined

TNF

may

effect

cells with

probably

have

were

acted

multiple

combinations

may

up-regulate

was

IFN-y.

The

have

tential the

use

an is

tion,

and

U/ml

cytokines

presented of THP-i

M-CSF.

IFN-y,

be

a

may in this

cells

cell-mediated

the

fashion

They

as a model

antitumor

to

StCrlabeled

or IFN-y

6.

in 7.

are

known

been

9.

murine macrophage interferon activity.).

pathways. receptors in the presecreted,

demonstrate system

to cells

as

the

po-

1 1.

12.

for evaluating

maturation molecule

13.

and acquiup-regula-

14.

cytotoxicity.

3.

Stanley,

ER.

growth

and

used

mean

as targets.

percent

Both

cytotoxicity

cells ±

were SD

from

Ia antigen

expression

(i982)

differentiation

Structure-function

studies

257, !3679. Tushinkski, RJ., Bartelmz, lineage-specific hemopoietic

ofa

colony

stimu-

C/tern.

Stimulation factor

S.H. (1983) CSFgrowth factor. J.

of macrophage tumoricidal CSF-1. Cell. Immunol. 105,

i8.

activity

ICAM-!

in

human

serum:

et al.

141,

induction

cell agents

with

immune

lines and

of

intercellular

adhesion

by pro-inflammatory cytokneutralizing antibodies. J.

1665.

Webb, D.S., Mostowski, H.S., Gerrard, hancement of ICAM-! expression results

Cytokine-induced envulnerability of tumor cells to monocyte-mediated lysis. J. Immunol. 146, 3682. Rice, G.E., Munro, J.M., Corless, C., Bevilaqua, M.P. (199!) Vascular and nonvascular expression of INCAM-ilO. A target for mononuclear leukocyte adhesion in normal and inflamed human tissues. Am. J. Pathol. 138, 385. Rice, G.E., Bevilacqua. M.P. (1989) An inducible endothelial cell surface glycoprotein

270.

Kimball

17.

by a lymphokine

Buckle, AM., Hogg, N. (1990) Human memory T cells express intercellular adhesion molecule-i which can he increased by interleukin 2 and interferongamma. Eur. J. Immunol. 20, 337. Gerrard, T.L., Siegel, J.P., Dyer, DR., Zoon, K.C. (1987) Differential effects of interferon-a and interferon-y on interleukin 1 secretion by monocytes. J. Immunol. 138, 2535. Nathan, CF., Murray, H.W., Weibe, ME., Ruhin, BY. (1983) Identification of interferon-)’ as the lymphokine that activates human macrophage oxidative metabolism and antimicrobial activity. J. Exp. Med. 159, 8!2. Jett, JR., Montovani. A., Herberman, RB. ( !980) Augmentation of human monocyte-mediated cytolysis by interferon. Cett. Immunot. 54, 425. Rothlein, R., Mainolfi, E.A., Czajkowski, M., Marlin, S.D. (1988) A form of

Immunol.

lating factor (CSF-1). J. Biol. Stanley, E.R., Guilbert, Li., 1-a mononuclear phagocyte Cell. Biochem. 21, 151. Ralph, P., Nakoinz, I. (1987) by the

were

are

molecule 1 on primary and continuous ines. Regulation by pharmacologic

16.

2.

cells

Exp. Med. 156, 1780. Kelley, yE., Fiers, W., Strom, TB. (1984) Cloned human interferon-y, but not interferon-n or -a induces expression of HLA-DR determinants by fetal monocytes and myeloid leukemic cell lines. J. immunol. 132, 240.

10.

REFERENCES S.K.,

Data

Scheibenbogen, C., Andreesen, R. (199!) Developmental regulation of the cytokine repertoire in human macrophages: IL-!, IL-6,TNFa, and M-CSF.J. Leukoc. Biol. 50, 35. Steeg, P.S., Moore, R.N., Johnson, H.M., Oppenheim, J. (1982) Regulation of

circulating

Das,

A-375 M-CSF.

4339. 8.

M-CSF

15.

1.

+

Sampson-Johannes, A., Carlino, J. (1988) Enhancement of human monocyte tumoricidal activity by recombinant M-CSF. J. Immunol. 141, 3680. Moore, RN., Oppenheim, Jj., Farrar, ii., Carter, CS., Waheed, A., Shadduck, R.K. (1980) Production oflymphocyte-activating factor (interleukin-!) by macrophages activated with colony-stimulating factors.J. Immunol. 125, 1302. Warren, M.K., Ralph, P. (1986) Macrophage growth factor CSF-i stimulates human monocyte production of interferon, tumor necrosis factor and colony stimulating activity. J. Immunol. 137, 2281. Navarro, S., Debili, N., Bemaudin, i-F., Vainchenker, W., Doly, J. (1989) Regulation of the expression of IL-6 in human monocytes. J. Immunol. 142,

5.

se-

and

stimulate

signaling of cytokine examined

have paper

and

4.

secreted

that

IFN-y

affect.

of cytokines on monocyte of cytokine synthesis, adhesion

and

to

by

implies

known

effects

sition

oflFN

or 1000

found

stimulated

at which

had

IFN-y

Other

results

100

activate these cells. It is not may be involved, and there

points

FcyRs.

study.

combination

not

This

through a wide variety of intracellular There may have been up-regulation and of adhesion molecules other than sent well.

with M-CSF,

in an autocrine

synergy with IFN-y to further clear what other mechanisms are

U/mI

triplicate.

of THP-i

when

100

cytokines secreted in the cultures, but (not shown) suggest that cytotoxic

results

mechanisms TNF

cytotoxicity

(Veh),

cytotoxic of the

direct effect preliminary

Experiment

Augmented

mediates

cytokine

melanoma

and

adhesion.

adhesion

T.L. (1991) in increased

Science

molecule

246,

1303.

expression.

593

!9.

20.

S., Camhiaggi, A., Poggi, A., Meazza, R., Canevari, S., L. (!994) The LFA-i/ICAM cell adhesion pathway is involved in tumor-cell lysis mediated by bispecific monoclonal-antibodytargeted T lymphocytes. In:. J. Cancer 56, 846.

32.

Colnaghi,

MI.,

Bouillon,

M., Tessier,

33.

F’errini,

S., Sforzini,

Regulation

2!.

22.

25.

Boulianne,

R.,

Destrampe,

R.,

Audette,

M. (199!)

by retinoic

macrophage

colony’

cells to a cytotoxic state. Finbloom, D.S., Lamer, human monocytes with results

24.

P.,

acid of ICAM-! expression on human tumor cell lines. Biochim. Biophs. Acm 1097, 95. Vanky, F., Wang, P.. Patarroyo, M., Klein. E. (!990) Expression of the adhesion molecule ICAM-! and major histocompatibility complex class I antigens on human tumor cells is required for their interaction with autologous lymphocytes in vitro. Cancer Immunol. Immunother. 31, 19. Curley, S.A., Roh, MS.. Kleinerman, E., Klostergaard, J. (1990) Human recombinant

23.

Moretta,

stimulating

factor

activates

murine

355. A., Nakagawa, Y., Hoover, D.L. (1993) granulocyte-macrophage colony-stimulating Lymphokine

in enhancement

of IFN-y

Res.

receptors

R.P.

(1992)

Monoclonal

35.

36.

9,

but

suppression

antibodiestargeting

Culture of factor

murine

of c-fos

interleukin

37.

of INF-y--induced

expression ofthe gene IP-!O. J. Immunol. 150, 2383. Kovacs. E.J., Oppenheim, Jj., Young, HA. (!986) Induction c-myc expression in T.lymphocytes following treatment with interleukin Ia. J. Inamunol. 136, 3649. Wuthnch,

Kupifer

34.

and

38.

recombinant 39. LFA-1

induce Cell. Im-

LFA-1/ICAM-!-independent homotypic lymphocyte aggregation. 144,22. van Kooyk, Y., We(ler, Pfrleije, K., de Waal Malefijt, R., Figdor, C.G. (1993) Role of intracellular Ca levels in the regulation of CD! 1aJCD18 mediated cell adhesion. C’ell ,4dhes. C’onzmun. 1 , 2!. Rothlein, R., Springer. TA. (1986) The requirement for lymphocyte funcLion-associated antigen 1 in homotypic leukocyte adhesion stimulated by phoubol ester. J. Exp. Med. 163, 1132. Weiner, L.M. (199!) Applications of gamma-interferon in cancer therapy.

munol.

26.

27.

28.

Mol.

29. 30.

3!.

594

Biother.

E.V. (1991) Characterization of inhibitory activities secreted by leukemia cells and regulation by interferon-y. Growth Regul. 1, 85. D.-E., Hetherington, CJ., Gonzalez, D.A., Chen, H.-M., Tenen, D.G. Regulation of CD!4 expression during monocytic differentiation inwith la,25-dihydroxyvitamin D3. J. Immunol. 153, 3276. Schook, LB., Alhrecht, H., Gallay, P., Jongeneel, CV. (1994) Cytokine regulation ofTNF-a mRNA and protein production by unprimed macrophages from C57BI16 and NZW mice. J. Leukoc. Biol. 56, 514.

Journal

of

Leukocyte

Biology

Volume

58,

November

1995

1, and

tumor

necrosis

factor-a

increases

neutrophil

adherence

by

a CDw18-dependent mechanism. J. Immunol. 136, 4548. Weiner, L.M. (1991) Applications of gamma-interferon in cancer therapy. tilol. Biother. 3, 186. Grups, J.W., Frohmuller, H.G. (1989) Cyclic interferon gamma treatment of patients with metastatic renal carcinoma. Br. J. Urol. 64, 218. Kirschcnbaum, AS., Woroheck, A.S., Goff, J.P., Davis, TA., Metcalf, D.D. ( 1995) Interferon gamma but not interferon alpha inhibits the growth of mast cells from CD34 cells derived from human marrow. J. Allergy Clin. immunol. 95,296.

40.

4!.

3, 186.

Gaffney, THP-! Zhang, (!994) duced

Oster, W., Brach, MA., Gross, H.-J., Mertelsmann, R., Herrmann, F. (1992) Interleukin-i3 (IL-1) expression in human blood mononuclear phagocytes is differentially regulated by granulocyte-macrophage colony stimulating factor (GM-CSF), M-CSF and IL-3. Blood 79, 1260. Evans, R., Duffy, TM., Blake, 5.5., Lin, H-S. (1989) Regulation of systemic macrophage IL-i gene transcription: the involvement oftumor-derived macrophage growth factor, CSF-1. J. Leukoc. Biol. 46, 428. Springer. TA. (1990) Adhesion receptors ofthe immune system. Nature 346, 425. Most, J., Sehwaeble, W., Drach, J., Sommerauer, A., Dierich, M.P. (1992) Regulation of the expression of ICAM-! on human monocytes and monocytic tumor cell lines. J. immunol. 148, 1635. Pohlman, T.H., Stanness, K.A., Beatty, PG., Ochs, H.D., Harlan, J.M. (1986) An endothelial cell surface factor(s) induced in vitro by lipopolysaccharide,

42.

De Mulder, D.H.M., Oosterhof, CON., Bouffioux, C.. van Oosterom, AT., Vermeylen, K., Sylvester, R. (1995) EORTC (30885) randomised pllase III study with recombinant interferon alpha and recombinant interferon alpha and gamma in patients with advanced renal cancer. Br. J. Cancer 71, 37!. Wiener, L.M., Li, W., Holmes, M., Catalano, RB., Dovnarsky, M., Padavic, K., Alpaugh, R.K. (1994) Phase I trial of recombinant macrophage colonystimulating factor and recombinant y-interferon: toxicity, monoeytosis, and clinical effects. Cancer Res. 54, 4084. Munn, D.H., Armstrong, E. (1993) Cytokine regulation of human monocyte differentiation

colony

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