Authors:H. Enginar, P. Ünak, F. Yurt, and F. Zümrüt Biber
An oestrogen derivative 3,17-a-oestradiolyl propyl 1,4,8,11-tetraazacyclotetradecanyl-1-(4-methylbenzoic acid)ester (ESTCPTA) that is 3,17-a-oestradiolyl propinol coupled to 1-(4-methylbenzoic acid)1,4,8,11-tetraazacyclotetradecane (CPTA) was synthesized in five steps. The product was purified by recrystallization in ethyl alcohol, and analysed by NMR and IR spectroscopy. ESTCPTA was labeled with 99mTc and radio thin layer chromatography (RTLC) and radio-paper electrophoresis were used to determine the radiochemical yields. Specific activity was approximately 23.7 GBq/mmol and the labeling yield was over 95%. The biodistribution studies were performed on female Albino Wistar rats. The rats were sacricified by ether narcotization at certain time intervals and the activity of the organs was counted by a gamma counter. The activity per gram tissue was calculated and time activity curves were generated.
Authors:H. Enginar, P. Unak, F. Yurt Lambrecht, and F. Biber
An estrogen derivative 1-(3, 17-α-estradiolyl propin-1-yl-3-(1,4,8,11-tetraazacyclotetradecyl)-propanate (ESTACPA) was synthesized.
The product was purified by HPLC and characterized by NMR and IR spectroscopy. The synthesized compound was labeled with 99mTc. The biodistribution studies were performed on female Albino Wistar rats. The rats were sacrificed and their organs were
removed. The radioactivities of the organs were counted using a gamma-counter. The activity per gram tissue was calculated
and time versus activity curves were generated. The 99mTc-ESTACPA uptake by the uterus and ovary such as ER-rich tissues, were observed. The pancreas and stomach also showed a significant
Authors:F. Z. Biber, P. Unak, H. Enginar, T. Ertay, E. I. Medine, C. Tasci, and H. Durak
An estrogen derivative, β-estradiol or 1,3,5,(10)-estratriene-3,17β-diol) attached to diethylenetriamine pentaacetic acid
(DTPA) was synthesized in six experimental steps. At the end of these steps, a DTPA-attached estradiol derivative called deoxy-demethyl
homoestradiolyl-diethylenetriamine-pentaacetic acid (ESTDTPA) was obtained. The synthesized compounds were labeled with 99mTc. Thin layer radio chromatography (TLRC) was used to determine radiochemical yields and stabilities.Structural investigations
confirmed the structures. The labeling yield was satisfactory (about 95%), and 99mTc-ESTDPTA was stable in neutral medium at room temperature for 5 hours. Biodistribution studies were performed on normal
and DMBA-induced, tumor bearing female Albino Wistar rats. The activity per gram tissue was calculated, and time-activity
curves were plotted. ESTDTPA uptake by uterus reached a level of 20.73% dose/g, showing a maximum within 5 minutes after injection.
Ovary and breast showed similar biodistribution profiles. The kidneys, which are the primary organs of metabolism and excretion
of estrogen, showed a high 99mTc-ESTDTPA uptake. The imaging studies were performed on normal and tumor bearing female Albino Wistar rats using a Camstar
XR/T gamma-camera. Gamma-scintigraphy studies showed that tumors could be well visualized in a few minutes and clearly differentiated
from other organs, such as bladder and liver by 24 hours.
Authors:H. Enginar, P. Unak, F. Y. Lambrecht, F. Z. Biber, E. İ. Medine, and B. Cetinkaya
The aim of this study is to synthesize novel 131I labeled estrone derivatives that may have therapeutical potentials on Estrogen Receptor rich tumors. Two radiolabeled estrone derivatives, [131I]2-iodo-3-methoxy-estra-1,3,5-trien-17-one and [131I]4-iodo-3-methoxy-estra-1,3,5-trien-17-one were synthesized. Ether amino estrone derivatives were obtained from estrone in three steps by means of diazonium compounds. Tissue distribution studies exhibited receptor-mediated uptake in target organs in female Albino Wistar rats. Maximum uptakes for 2-iodo[131I]-3-methoxy-estrone are in stomach, pancreas, intestines and uterus. A similar biodistribution profile was obtained for 4-iodo[131I]-3-methoxy-estrone. However 2-iodo-3-methoxy-estra-1,3,5-trien-17-one has higher uptake in stomach, kidneys, pancreas, and intestines than 4-iodo-derivative.
Authors:H. Enginar, P. Unak, F. Biber Müftüler, F. Lambrecht, E. Medine, S. Yolcular, A. Yurt Kilcar, B. Seyitoğlu, and I. Bulduk
The aim of this study was to synthesize a glucuronide conjugated morphine derivative which could be labeled with 131I, as a radiopharmaceutical, and to investigate its radiopharmaceutical potential using biodistribution studies in male Albino
Wistar rats. Morphine was extracted from dry capsules of the opium poppy (Papaver somniferum L.). It was conjugated with UDP-glucuronic acid by using UDP-glucuronyl transferase (UDPGT) enzyme rich microsomes, purified
by high performance liquid chromatography (HPLC) and characterized by nuclear magnetic resonance (NMR), infrared (IR) spectroscopy
and liquid chromatography mass spectroscopy (LC-MS/MS). Normal and receptor blockage biodistribution studies were performed
in male Albino Wistar rats. The results of the tissue distribution studies showed that 131I labeled morphine glucuronide (131I-mor-glu) uptake in the small intestine, large intestine and urinary bladder was higher than in the other tissues of the
rats in the blocked receptor and unblocked receptor. A greater uptake of the radio labeled substance was observed in the hypothalamus
and mid brain than in the other branches of the rats’ brains.
Authors:H. Enginar, P. Unak, F. Müftüler, F. Lambrecht, A. Kilcar, S. Yolcular, B. Seyitoğlu, E. Medine, and I. Bulduk
In current study, ethyl-morphine (em) was synthesized from the morphine and glucuronidated via enzymatic mechanism. The conjugated
glucuronide ethyl-morphine (em-glu) was radiolabeled with 131I using iodogen method. The quality control studies of radiolabeled compound (131I-em-glu) were done with Thin Layer Radio Chromatography to confirm the radiolabeling efficiency. Biodistribution studies
of 131I labeled em-glu were run on healthy male Albino Wistar rats. The distribution figures demonstrated that 131I-em-glu was eliminated through the small intestine, large intestine and accumulated in urinary bladder both receptor blocked
and unblocked biodistribution studies. A greater uptake of the radiolabeled substance was observed in the m.pons, hypothalamus
and mid brain than in the other branches of the rats’ brains.
Authors:H. Enginar, P. Ünak, F. Lambrecht, F. Biber Müftüler, E. Medine, S. Yolcular, A. Yurt, B. Seyitoğlu, and I. Bulduk
Codeine which was extracted from dry capsules of the opium poppy (Papaver somniferum) was purified by HPLC (High Performance Liquid Chromatography) and characterized by NMR (Nuclear Magnetic Resonance) and
IR (Infrared) spectroscopy techniques. The purified compound was labeled with 131I and biodistribution studies were performed in rats. Radioiodinated codeine distributed uniformly in the cerebellum, m.pons,
striatum and hypothalamus while the other branch of brain and Stomach, urinary bladder, and small intestine uptakes were significantly
higher than other tissues.