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ACTIVATION OF THE CYTOTOXIC EFFECT OF SOME CYTOSTATICS THROUGH
EXPOSURE AT OPTICAL RADIATION
CEEX: nr.2-Cex-06-D11-32
Mihail Lucian Pascu1*, Alexandru Pascu1, Angela Staicu1, Madalina Dicu1, Doina Gazdaru2, Marieta Costache3, Jacques Barbe4, Abdallah Mahamoud4, Michelle Ferrari5, Silvia Rao5, Ligio Liggieri5, Benone Carstocea6
ACTIVATION OF THE CYTOTOXIC EFFECT OF SOME CYTOSTATICS
THROUGH EXPOSURE AT OPTICAL RADIATION
1National Institute for Laser, Plasma and Radiation Physics, Bucharest; 2 Physics Faculty, University of Bucharest; 3 Faculty of Biology, University of Bucharest;4Faculty of Pharmacy, Universite Mediterrannee of Marseille; 5 CNR- Institute for Energetics and Interphases, Genova 6 Central Military Hospital, Ophthalmology Clinic, Bucharest
APPLICATIONAPPLICATIONFighting resistance to treatment (microbes, Fighting resistance to treatment (microbes, malignant tumours, pseudotumours) by: malignant tumours, pseudotumours) by: - modifications induced in molecular - modifications induced in molecular structures of medicines following exposure to structures of medicines following exposure to optical (un-coherent, coherent) radiation.optical (un-coherent, coherent) radiation.- developing new ways to deliver the medicine - developing new ways to deliver the medicine to targetto target
Medicines: cytostatics, either commercially Medicines: cytostatics, either commercially available or specifically designedavailable or specifically designed
APPLICATIONAPPLICATION Levels/steps of research development:Levels/steps of research development:- exposure of the medicines solutions to - exposure of the medicines solutions to optical radiation and study the molecular optical radiation and study the molecular modifications, if any;modifications, if any;- evidence the modifications induced in cell - evidence the modifications induced in cell cultures at interaction with solutions cultures at interaction with solutions containing modified medicines; containing modified medicines; -evidence action of the modified medicine on -evidence action of the modified medicine on pseudotumour tissues produced on eyes;pseudotumour tissues produced on eyes;- generation and study of microdroplets - generation and study of microdroplets which contain medicines in solutionwhich contain medicines in solution
Spectral studies of some alkylphenyl- pyridinium compounds under light Spectral studies of some alkylphenyl- pyridinium compounds under light irradiationirradiation
Samples supplied by University of Marseille, Faculty of Pharmacy, Prof. Jacques Barbe.
Spectral studies of some alkylphenyl- pyridinium compounds Spectral studies of some alkylphenyl- pyridinium compounds under light irradiationunder light irradiation
280, 410 515 Exposure to optical radiation does not induce significant modifications of the spectra.
BG204 240, 273, 351, 369, 388, 480
310, 382, 440, 478
570 Absorption, fluorescence excitation and emission bands decrease with the irradiation time.
BG 585 256, 394 280, 410 450 Exposure to optical radiation does not induce significant modifications of the absorption spectra. Slight change in the fluorescence intensity with the increase of the exposure time.
BG1120 259, 379 300, 380, 410 476 The intensity of the absorption, fluorescence excitation and emission bands decrease with the increase of the exposure time.
Spectral studies of some alkylphenyl- pyridinium compounds Spectral studies of some alkylphenyl- pyridinium compounds under light irradiationunder light irradiation
Samples: Water solutions of BG204 (2x10-5 M ) , BG 558 and BG 1120 (5x10-5 M) - concentration currently used for clinical applications; Water solutions of BG 186 at 5x10-5M in 2% methanol
Irradiation: Xe lamp, power density 11mW/cm2, spectral range 200 -1100 nm, irradiation time: 4 min ÷ 180 min
Spectra: Absorption, fluorescence and FTIR spectra were made; for FTIR, solutions exposed to radiation up to 3 hours, then poured on KBr crystal and let one day to dry. The resulted solid samples were grounded and pressed at 1.575 x 105 kg cm-2 which allowed to
obtain pellets used further to be measured by FTIR.
1400 cm-1, ring stretching mode in thiols680 cm-1, in-plane C – S - H bending
1098 cm-1, 1638 cm-1 and 1579 cm-1, C=S bond in lactam form
1400 cm-1 bending vibration in NH 43500 – 3100 cm-1, N–H stretching Vibration in NH4+
BG 1120: POSSIBLE PHOTOCHEMICAL PROCESSES
NN
CH3
NN
+ hv2CH2 CH2 N(CH3)2 +
+2H+2H
S S
SH SH2CH3-CH2-N(CH3)2
dithiol
aliphatic tertiary amine
S
NN
S
CH2-CH2-N(CH3)2
CH2-CH2-N(CH3)2
CH3
CH3
12 days after procedure, the eyes were injected BG 1120 under the conjunctiva, near the affected area.
“IN VIVO” STUDIES FOR PSEUDOTUMOUR TREATMENT ON RABBIT EYES
BEFORE INJECTING BG 1120
The Schmidt - Erfurth rabbit eye experimental model on conjunctive tissue inflammation and rich neovascularization. Pseudo-tumours with new vascularisations were induced by sewing a catgut stitch 2.0 at the sclero - corneal limbus and by injecting a prostaglandinic-like substance (Travatan 0.1 ml), with proinflammatory action nearby, under the conjunctiva.
NEOVASCULAR TISSUE
1st eye (not- treated) presents surrounding the necrotic stitch a large quantity of inflammatory cells as well as neovascularisations and a small amount of fibrosis.80x
The 2nd eye (in which not irradiated substance was introduced) has the same tissular modifications, however much reduced.100x
3rd eye ( irradiated substance) the quantity of the inflammatory infiltrate and oedema is decreased comparing to the 2nd eye. 200x
4th eye –irradiated, the neovascularisations and the inflammatory cells are diminished100x
CONCLUSIONS
The photo-transformation of the BG 1120 analysed samples shows that the molecules are photo-reactive and their therapeutic effect may be improved by exposure to UV-VIS radiation.
BG 1120 decreased inflammation and neovascularisations in the conjunctival tissue, especially after being irradiated.
Two mechanisms could be involved in the process: • the cytostatic mechanism: interference with the DNA synthesis and the cellular replication in the tissues with active proliferation.• the photosensitising mechanism that leads to the singlet oxygen and free radicals and finally to necrosis of the “treated” tissue.
Direct exposure of the eye injected not recommended.
THE CHEMICAL STRUCTURE OF: DAUNORUBICIN, DOXORUBICIN, IDARUBICIN (ANTRACICLINES)
DAUNORUBICIN EMISSION FLUORESCENCE SPECTRUM (FOLLOWING EXPOSURE TO LASER BEAM)
200 400 600 800 1000
100
200
300
400
500
0' 3'
excit
=480 nm
daunorubicin
c=10-5 M
(nm)
inte
nsi
ty (
arb
.un
it)
Nd:YAG LASER WITH PARAMETRIC OSCILLATOR: PULSED REGIME, PULS REPRATE 10Hz, PULSE TIME WIDTH 5ns, PULSE AVERAGE ENERGY 25mJ
MICRODROPLETS STUDIES OBJECTIVESThe characterization of wetting properties of generated droplets, on hydrophobicand superhydrophobic surfaces, considering the specificity of the droplets content and their potential use in malignant tumours treatment. MEASUREMENTS-Surface Tensions (ST) -Contact AngleThe studies of the drug molecules adsorption performed at liquid-air and liquid-solid interface (surfaces with water contact angle above 90° - hydrophobic and above 150° - superhydrophobic).MATERIALSSolutions containing: * Anthracene derivative - 4,5 bis[thio(2NNdimethylaminoethyl)], 9methyl1,8 diazaanthracene, code BG1120; * Doxorubicin – pure substance commercially available; at 10 -3 M, 10 -4 M and 10 -5 M concentrations in waterMETHODDrop Shape AnalysisMEASUREMENTS SYSTEMS: - Profile Analysis Tensiometer (Sinterface, PAT 1)- Automatic Surface Tension Real-time Acquisition – ASTRA
Surface tension measurements
Air - water /medicines water solutions - solid interfaceContact angle water drop/solid surface θ < 90º: hydrophilic surface -
good wettingContact angle water drop/solid surface θ > 90º : hydrophobic surface -
poor wettingContact angle water drop/solid surface θ > 150º : super hydrophobic or ultraphobic surface – even poorer wetting
The drop shape is governed by the action of forces pulling at the three-phase contact line of the drop in the plane of solid.
σAS = σSW + σAW cos θ (Young equation, 1807)
Surface tension (N/m) = Surface energy (J/m2 )
Capillary flow
σAS
σAW
σSW
ConcentrationConcentration BG1120BG1120
γ (mN/m)γ (mN/m)
DoxorubicinDoxorubicin
γ (mN/m)γ (mN/m)
WaterWater
γ (mN/m)γ (mN/m)
SolventSolvent
C = 1x10C = 1x10-5-5M M 72.3 (72.3 (±0.8)±0.8) 72.5 (72.5 (±0.6)±0.6)
C = 1x10C = 1x10-3-3M M 71.0 (71.0 (±0.9)±0.9) 72.3 (72.3 (±0.4)±0.4)
C = 1x10C = 1x10-3-3M - ROM - RO 69.6 (69.6 (±1.2)±1.2) -- Distilled waterDistilled water
Measurements concerning Dynamic Surface Tension (DST) showed that in BG1120 case, the obtained values for the solutions prepared in laboratory and for the solution prepared four months ago, are closed; within the limits of the errors of measurement are close to the pure water value .
The same holds for Doxorubicin.
Surface tension measurements
Volume
time (s)
0 200 400 600 800 1000 1200 1400 1600
volu
me
( l
)
37.0
37.2
37.4
37.6
37.8
38.0
38.2
38.4
Surface tension (left) and the control parameter – volume (right) – Doxorubicin’s concentrations.
The values obtained at the contact angles measurements at liquid-solid interface for superhydrophobic surface
ConcentrationConcentration BG1120BG1120
αα (o)(o)
contact anglecontact angle
DoxorubicinDoxorubicin
αα (o)(o)
contact anglecontact angle
WaterWater
αα (o)(o)
contact anglecontact angle
SolventSolvent
C = 1x10C = 1x10-5-5M M 157.9 (157.9 (±0.6)±0.6) 169.0 (169.0 (±1.4)±1.4)
170.1 (170.1 (±0.4)±0.4)
Ultrapure Ultrapure waterwater
C = 1x10C = 1x10-4-4M M 162.9 (162.9 (±0.5)±0.5) 169.4 (169.4 (±0.6)±0.6)
C = 1x10C = 1x10-3-3M M 156.6 (156.6 (±±1.4)1.4) 170.0 (170.0 (±1.4)±1.4)
C = 1x10C = 1x10-3-3M – 4 monthsM – 4 months 163.1 (163.1 (±1.3)±1.3) -- Distilled waterDistilled water
The values represent the mean values (of the left and right angle) obtained
into a set of data corresponding to a drug concentration
Droplet images on superhydrophobic
surface, left – water, right – BG1120
Temperature = 20oC
Capillary outer diameter=0.21 mm
Droplet volume = 5µl
The time evolution of the contact angles; the mean values are represented for the left and right angles of the droplets (generated on the same local superhydrophobic surface) for a set of data corresponding to BG1120 concentrations; the control parameter was represented by the drop size (h)
The contact angles time evolution. The mean values are represented for the left and right angles of the droplets for BG1120 and pure water; the control parameter is the drop size (h)
BG1120_hydrophobic surface
time (s)
0 200 400 600
c.a
ng
le (o)
120
122
124
126
128
130
132
134
136
138
140
C=10-5MC=10-4MC=10-3MC=10-5M RO Apa pura
Drop size (h)
time (s)
0 200 400 600
h.d
rop
(cm
)
0.02
0.04
0.06
0.08
0.10
H2O on superhydrofobic surface BG1120 on superhydrofobic surface
Droplet volume = 5 µl = ct.; Dcapillary = 0.21 mm
MOVIE
Conclusions
The measurements show that the equilibrium values of the ST are constant in time and equal for all drugs concentrations - the ST values do not depend on the drug concentrations in the solutions.
The values are close to pure water ones – i.e. at drug concentrations which were used the adsorption effects at water-air interface are absent or very low and the distribution of drug molecules in droplet is uniform and remains constant in time
The equilibrium values of contact angles of droplets on superhydrophobic surfaces do not depend on the solution concentrations - the droplets do not wet the surface; they have a good compatibility with it, from the point of view of the droplet instrumentation.
The equilibrium values of the contact angles of the droplets on hydrophobic surfaces do not depend on the solution concentrations and are nearly as high as for the pure water.
Conclusions
Staff: 12 people; two young scientists hired Equipment aquisition, such as : Nd:YAG/OPO laser, computing equipment, optics equipment/components to measure LIF, etc.
Oportunity to cooperate/continue cooperation in Romania and abroad.
-In Romania: * Continuing: +University Bucharest , Faculty of Physics
+ Central Military Hospital, Ophthalmology Clinic, Bucharest
* New: + University Bucharest, Faculty of Biology
-Abroad: * New: + Faculty of Pharmacy, Universite Mediterrannee of Marseille; + CNR- Institute for Energetics and Interphases, Genova
Conclusions
International cooperation:-European COST networks:
+Network P21 Physics of Droplets+ Networks B16, BM 0701 Resistance to treatment+ Romanians in foreign laboratories: 2
> STSM at Genova; in preparation at Berlin/Max Planck Institute> working stage at Faculty of Biology, University of Becancon
+ Foreign scientists 1: from Genova to Bucharest, end 2008 Published papers in ISI journals: 5, at the moment Communications: 22+ In Romania at National conferences: 8 (CNF, Annual Conference of the Physics Faculty, University of Bucharest, National Conferences of opthalmology, INDLAS)+ INVITED PAPERS at International conferences: 14 (4 LASER FLORENCE, Italy; 3 COST medicine/biology conferences – Istanbul, Copenhagen, Budapest; 1 AMAA - Bucharest; 1 SIS 2008 – Berlin; 1 COST physics conference – Erlangen; 3 International opthalmology conferences- Sinaia, Viena, Bucharest; 1 accepted at the Gordon Conference 2009, Galvestone USA )