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Tonini E, Panareo S, Longo M, Longo L, Urso L, Caracciolo M, Uccelli L, Cittanti C, Turra A, Bartolomei M. PRRT for patients with neuroendocrine tumor: how does the reduction in the number of SPECT CT studies affect tumor and OAR dosimetry? Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00201-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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2
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Tonini E, Panareo S, Longo M, Longo L, Urso L, Caracciolo M, Uccelli L, Cittanti C, Turra A, Bartolomei M. PRRT in patients with neuroendocrine tumor: preliminary results of OAR dosimetry and dose-response relationship for NET hepatic metastases. Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00448-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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3
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Boschi A, Ou L, Pasquali M, Giganti M, Rossi Alvarez C, Pupillo G, Skliarova H, Cisternino S, Duatti A, Esposito J, Martini P, Cicoria G, Marengo M, Uccelli L. A remotely controlled module for an in-hospital routine production of Tc-99m by medical cyclotrons. Nucl Med Biol 2019. [DOI: 10.1016/s0969-8051(19)30318-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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4
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Uzunov NM, Melendez-Alafort L, Bello M, Cicoria G, Zagni F, De Nardo L, Selva A, Mou L, Rossi-Alvarez C, Pupillo G, Di Domenico G, Uccelli L, Boschi A, Groppi F, Salvini A, Taibi A, Duatti A, Martini P, Pasquali M, Loriggiola M, Marengo M, Strada L, Manenti S, Rosato A, Esposito J. Radioisotopic purity and imaging properties of cyclotron-produced 99mTc using direct 100Mo(p,2n) reaction. ACTA ACUST UNITED AC 2018; 63:185021. [DOI: 10.1088/1361-6560/aadc88] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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5
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Bolzati C, Santimaria M, Boschi A, Uccelli L, Duatti A, Riva P, Piffanelli A. An improved procedure for the efficient labeling of antibodies with Re-188. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.25804401200] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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6
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Bolzati C, Mahmood A, Malagò E, Uccelli L, Boschi A, Jones AG, Refosco F, Duatti A, Tisato F. The [99mTc(N)(PNP)]2+ Metal Fragment: A Technetium-Nitrido Synthon for Use with Biologically Active Molecules. The N-(2-Methoxyphenyl)piperazyl-cysteine Analogues as Examples. Bioconjug Chem 2003; 14:1231-42. [PMID: 14624640 DOI: 10.1021/bc034100g] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The incorporation of a bioactive molecule into a nitrido-containing (99m)Tc-complex has been successfully achieved by using the [TcN(PNP)](2+) metal fragment. In this strategy, the strong electrophilic [TcN(PNP)](2+) metal fragment efficiently reacts with bifunctional chelating ligands having a pi-donor atom set, such as N-functionalized O,S-cysteine. The 2-methoxyphenylpiperazine (2-MPP) pharmacophore, which displays preferential affinity for 5HT(1A) receptors, was conjugated to the amino group of cysteine to obtain 2-MPPP-cys-OS, where 2-MPPP is 3-[4-(2-methoxyphenyl)piperazin-1-yl]propionate. The asymmetric Tc(V)-nitrido complexes, [(99g/99m)Tc(N)(PNP)(2-MPPP-cys-OS)] (PNP = PNP3, PNP4), were obtained in high yield (95%), by simultaneous addition of PNP and 2-MPPP-cys-OS ligand to a solution containing a starting (99g)/(99m)Tc-nitrido precursor. A mixture of syn and anti isomers was observed, the latter being the thermodynamically favored species. In vitro challenge experiments using the anti isomers with glutathione and cysteine indicated that no transchelation reaction occurs. Assessment of the in vitro 5HT(1A) receptor-affinity of the technetium complexes revealed that only the anti-PNP4 complex possesses some affinity for the receptor, but displayed negligible brain uptake in biodistribution studies in rats in vivo.
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Affiliation(s)
- C Bolzati
- ICIS, CNR Corso Stati Uniti, 4, 35020 Padova, Italy.
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7
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Boschi A, Bolzati C, Uccelli L, Duatti A, Benini E, Refosco F, Tisato F, Piffanelli A. A class of asymmetrical nitrido 99mTc heterocomplexes as heart imaging agents with improved biological properties. Nucl Med Commun 2002; 23:689-93. [PMID: 12089492 DOI: 10.1097/00006231-200207000-00014] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Asymmetrical heterocomplexes containing a terminal technetium-nitrogen multiple bond coordinated to one diphosphine ligand (PNP) and one dithiocarbamate ligand (DBODC), were obtained through a simple two-step procedure under controlled conditions. The resulting complexes [99mTc(N)(PNP)(DBODC)]+ are monocationic, and possess a distorted square-pyramidal geometry where the Tc triple bond N multiple bond occupies an apical position and the diphosphine and dithiocarbamate ligands span the residual four coordination positions on the basal plane through the two phosphorus atoms and the two sulfur atoms, respectively. Biodistribution data in rats demonstrated that these complexes were rapidly extracted by the myocardium, and retained in this region for a prolonged time. After a few minutes post-injection, lung uptake became negligible, and liver washout was extremely rapid and quantitative. Analysis of heart/liver uptake ratios for these complexes revealed that their values increased exponentially in time, and after 60 min post-injection liver activity was almost completely eliminated into the intestine. Comparison with heart/liver ratios determined for 99mTc sestamibi and 99mTc tetrfosmin showed that values for these latter compounds were approximately 10 times lower than those measured for [99mTc(N)(PNP)(DBODC)]+ complexes at 60 min post-injection. In conclusion, the monocationic tracers [99mTc(N)(PNP)(DBODC)]+ exhibit high myocardial uptake in rats and dramatically high heart/lung and heart/liver ratios, suggesting that this novel class of perfusion agents could be conveniently employed to obtain heart images with superior imaging quality.
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Affiliation(s)
- A Boschi
- Laboratory of Nuclear Medicine, Department of Clinical & Experimental Medicine, University of Ferrara, Via L. Borsari, 46, 44100 Ferrara, Italy
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8
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Boschi A, Bolzati C, Benini E, Malagò E, Uccelli L, Duatti A, Piffanelli A, Refosco F, Tisato F. A novel approach to the high-specific-activity labeling of small peptides with the technetium-99m fragment [99mTc(N)(PXP)]2+ (PXP = diphosphine ligand). Bioconjug Chem 2001; 12:1035-42. [PMID: 11716697 DOI: 10.1021/bc0155162] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new labeling approach for incorporating bioactive peptides into a technetium-99m coordination complex is described. This method exploits the chemical properties of the novel metal-nitrido fragment [99mTc(N)(PXP)]2+, composed of a terminal Tc[triple bond] N multiple bond bound to an ancillary diphosphine ligand (PXP). It will be shown that this basic, molecular building block easily forms in solution as the dichloride derivative [99mTc(N)(PXP)Cl2], and that this latter complex selectively reacts with monoanionic and dianionic, bidentate ligands (YZ) having soft, pi-donor coordinating atoms to afford asymmetrical nitrido heterocomplexes of the type [99mTc(N)(PXP)(YZ)]0/+ without removal of the basic motif [99mTc(N)(PXP)]2+. The reactions of the amino acid cysteine was studied in detail. It was found that cysteine readily coordinates to the metal fragment [99mTc(N)(PXP)]2+ either through the [NH2, S-] pair of donor atoms or, alternatively, through the [O-, S-] pair, to yield the corresponding asymmetrical complexes in very high specific activity. Thus, these results were conveniently employed to devise a new, efficient procedure for labeling short peptide sequences having a terminal cysteine group available for coordination to the [99mTc(N)(PXP)]2+ fragment. Examples of the application of this novel approach to the labeling of the short peptide ligand H-Arg-Gly-Asp-Cys-OH (H(2)1) and of the peptidomimetic derivative H-Cys-Val-2-Nal-Met-OH (H2) will be discussed.
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Affiliation(s)
- A Boschi
- Laboratory of Nuclear Medicine, Department of Clinical & Experimental Medicine, University of Ferrara, Via L. Borsari, 46, 44100 Ferrara, Italy
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9
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Tisato F, Refosco F, Porchia M, Cagnolini A, Bolzati C, Uccelli L, Boschi A, Malagò E, Duatti A, Bandoli G. Chemistry underlying the choice of the [99mTc(N)(‘PNP')’ metal-fragment for radiopharmaceutical application. J Labelled Comp Radiopharm 2001. [DOI: 10.1002/jlcr.25804401234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10
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Bolzati C, Boschi A, Uccelli L, Duatti A, Baraldi PG, Romagnoli R, Bianchi N, Mischiati C, Gambari R, Piffanellli A. A hybrid distamycin-cysteine labeled with Tc-99m as a model for a novel class of tumor imaging agents. J Labelled Comp Radiopharm 2001. [DOI: 10.1002/jlcr.2580440115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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11
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Marotta E, Gioacchini AM, Tisato F, Cagnolini A, Uccelli L, Traldi P. Electrospray ionization in the characterization of mer and fac isomeric forms of [Re(N)Cl(2)(POP)] (POP = bis[(2-diphenylphosphino)ethyl]ether). Rapid Commun Mass Spectrom 2001; 15:2046-2049. [PMID: 11675673 DOI: 10.1002/rcm.477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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12
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Boschi A, Uccelli L, Bolzati C, Marastoni M, Tomatis R, Spisani S, Traniello S, Piffanelli A. A CD(4)/T(4) receptor peptide ligand labeled with technetium-99m: synthesis and biological activity. Nucl Med Biol 2000; 27:791-5. [PMID: 11150712 DOI: 10.1016/s0969-8051(00)00165-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The octapeptide D-Ala-Ser-Thr-Thr-Thr-Asn-Tyr-Thr-NH(2) ([D-Ala(1)]TNH(2)), an analog of peptide T (H-Ala-Ser-Thr-Thr-Thr-Asn-Tyr-Thr-OH) associated with CD(4)/T(4) receptors involved in human immunodeficiency virus infection, was combined with the chelating polyazamacrocycle 1,4,8,11-tetraazacyclotetradecane (cyclam) to afford the bifunctional ligand cyc-[D-Ala(1)]TNH(2). This was then reacted with [(99m)TcO(4)](-) and Sn(2+) to yield the monocationic complex [(99m)Tc(O)(2)(cyc-[D-Ala(1)]TNH(2))](+). Biological activity of both the cyclam-peptide conjugate and the resulting Tc-99m complex were evaluated by measuring their chemotactic indexes. Results showed that N-cyclam acylation and subsequent labeling with Tc-99m of [D-Ala(1)]TNH(2) were tolerated, and both cyc-[D-Ala(1)]TNH(2) and [(99m)Tc(O)(2)(cyc-[D-Ala(1)]TNH(2))](+) retained the high chemotactic capacity of the original octapeptide. Biodistribution of the Tc-99m complex was carried out in rats. Fast blood clearance and no accumulation in organs of interest were observed.
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Affiliation(s)
- A Boschi
- Laboratory of Nuclear Medicine, Department of Clinical and Experimental Medicine, University of Ferrara, Ferrara, Italy
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13
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Bolzati C, Uccelli L, Boschi A, Malagò E, Duatti A, Tisato F, Refosco F, Pasqualini R, Piffanelli A. Synthesis of a novel class of nitrido Tc-99m radiopharmaceuticals with phosphino-thiol ligands showing transient heart uptake. Nucl Med Biol 2000; 27:369-74. [PMID: 10938472 DOI: 10.1016/s0969-8051(00)00099-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A novel class of technetium-99m radiopharmaceuticals showing high heart uptake is described. These complexes were prepared through a simple and efficient procedure, and their molecular structure fully characterized. They are formed by a terminal Tc(triple bond)N multiple bond and two bidentate phosphine-thiol ligands [R(2)P-(CH(2))(n)SH, n=2,3] coordinated to the metal ion through the neutral phosphorus atom and the deprotonated thiol sulfur atom. The resulting geometry was trigonal bipyramidal. Biodistribution studies were carried out in rats. The complexes exhibited high initial heart uptake and elimination through liver and kidneys. The washout kinetic from heart was dependent on the nature of the lateral R groups on the phosphine-thiol ligands. When R=phenyl, heart activity was rapidly eliminated within 10-20 min. Instead, when R=tolyl, cyclohexyl, persistent heart uptake was observed. Extraction of activity from myocardium tissue showed that no change of the chemical identity of the tracer occurred after heart uptake. On the contrary, metabolization to more hydrophilic species occurred in liver and kidneys.
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Affiliation(s)
- C Bolzati
- Laboratory of Nuclear Medicine, Department of Clinical and Experimental Medicine, University of Ferrara, Ferrara, Italy
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14
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Cittanti C, Mele D, Colamussi P, Giganti M, Ricci E, Dafermou A, Uccelli L, Piffanelli A. Underestimation of regional myocardial perfusion with Tc-99m sestamibi single-day rest-stress SPECT: a "drug washout" pitfall? Clin Nucl Med 2000; 25:255-7. [PMID: 10750962 DOI: 10.1097/00003072-200004000-00003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Myocardial perfusion scintigraphy with a Tc-99m sestamibi single-day SPECT protocol is a widely used technique to examine patients with possible or known coronary artery disease. A 76-year-old man with a clinical history suggestive of ischemic heart disease underwent Tc-99m sestamibi myocardial SPECT imaging with a same-day rest and stress protocol after temporary discontinuation of his current therapy, which included calcium channel and beta blockers and nitrates. The scintigraphic pattern was consistent with an asymptomatic infarction of the posterolateral myocardial wall and periinfarct ischemia. One week later, the patient had a Tc-99m sestamibi myocardial SPECT study at rest without discontinuing therapy, and scintigraphic images showed normalization of the posterolateral wall perfusion defect. The angiographic study showed a 90% stenosis of the circumflex artery. This case suggests that, during a 1-day cardiac SPECT protocol, washout of therapeutic pharmaceuticals may be responsible for underestimation of myocardial rest perfusion in territory supplied by a coronary artery with a critical stenosis.
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Affiliation(s)
- C Cittanti
- Section of Nuclear Medicine, University of Ferrara, Italy.
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15
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Bolzati C, Boschi A, Uccelli L, Duatti A, Franceschini R, Piffanelli A. An alternative approach to the preparation of (188)Re radiopharmaceuticals from generator-produced [(188)ReO(4)](-): efficient synthesis of (188)Re(V)-meso-2,3-dimercaptosuccinic acid. Nucl Med Biol 2000; 27:309-14. [PMID: 10832088 DOI: 10.1016/s0969-8051(00)00079-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new efficient approach for the preparation of (188)Re radiopharmaceuticals starting from [(188)ReO(4)](-), produced at a carrier-free level through the (188)W/(188)Re generator system, is described. The reaction procedure was based on the combined action of different reagents and has been applied in detail to the preparation of the therapeutic agent (188)Re(V)-DMSA (H(2)DMSA [meso-2,3-dimercaptosuccinic acid]). The most efficient combination required the use of SnCl(2), oxalate ions, and gamma-cyclodextrin. These were reacted with [(188)ReO(4)](-) and H(2)DMSA to afford the final radiopharmaceutical in high radiochemical purity, at room temperature, and in weakly acidic solution. The role played by the various reagents in the reaction was investigated. It was found that SnCl(2) behaved as the actual reducing agent, whereas oxalate and gamma-cyclodextrin greatly enhanced the ease of reduction of [(188)ReO(4)](-) through the action of two hypothetical mechanisms. In the first step of the reaction, oxalate ions gave rise to the formation of Re(VII) complexes with the concomitant expansion of the coordination sphere of the metal. This process strongly favored the electron transfer between Sn(2+) and Re(+7) centers, giving rise to intermediate reduced rhenium complexes. These species were further stabilized by the formation of transient host-guest aggregates with gamma-cyclodextrin and finally converted into (188)Re(V)-DMSA through simple replacement of the coordinated ligands by H(2)DMSA.
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Affiliation(s)
- C Bolzati
- Laboratory of Nuclear Medicine, Department of Clinical and Experimental Medicine, University of Ferrara, Ferrara, Italy
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16
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Marengo M, Aprile C, Bagnara C, Bolzati C, Bonada C, Candini G, Casati R, Civollani S, Colombo FR, Compagnone G, Del Dottore F, Di Guglielmo E, Ferretti PP, Lazzari S, Minoia C, Pancaldi D, Ronchi A, Sanità di Toppi G, Saponaro R, Torregiani T, Uccelli L, Vecchi F, Piffanelli A. Quality control of 99Mo/99Tcm generators: results of a survey of the Radiopharmacy Working Group of the Italian Association of Nuclear Medicine (AIMN). Nucl Med Commun 1999; 20:1077-84. [PMID: 10572919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
A multicentre survey of the quality control of 99Tcm generators has been completed: 245 generators from seven different commercial sources were tested over a period of 2 years. The results indicate that the mean pH of the eluates was 5.8 +/- 0.6; the aluminium contents were typically < 10 ppm; the radiochemical purity was 99.8 +/- 0.4% and the median 99Mo content was 3.8 x 10(-4) percent. The elution profiles gave a volume of 1.9 ml to obtain 50% of the total eluted activity and of 4.9 ml to obtain 95%. Other radionuclide impurities and heavy metal breakthrough were evaluated by graphite furnace absorption spectrometry and inductively coupled plasma mass spectrometry. National guidelines for the standardization of radiopharmacy procedures are currently being compiled.
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Affiliation(s)
- M Marengo
- Servizio di Fisica Sanitaria, Ospedale S. Orsola-Malpighi, Bologna, Italy
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17
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Colamussi P, Calò G, Sbrenna S, Uccelli L, Bianchi C, Cittanti C, Siniscalchi A, Giganti M, Roveri R, Piffanelli A. New insights on flow-independent mechanisms of 99mTc-HMPAO retention in nervous tissue: in vitro study. J Nucl Med 1999; 40:1556-62. [PMID: 10492379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023] Open
Abstract
UNLABELLED SPECT using 99mTc-hexamethyl propyleneamine oxime (HMPAO) mainly reflects regional cerebral blood flow, however metabolic abnormalities also affect the retention of 99mTc-HMPAO. METHODS To rule out any flow factor, a test-tube model was used to evaluate the effects of metabolic alterations both on intracellular trapping of 99mTc-HMPAO and on extracellular glutamate and lactate dehydrogenase (LDH) outflow from rat brain slices. RESULTS Under control conditions, slices took up 7.0%+/-1.4% of 99mTc-HMPAO contained in the medium, whereas prelabeled slices released 10.8%+/-2.6% of their radioactive content; glutamate and LDH outflow were 49.1+/-21.6 pmol/mg protein/ min and 4.8+/-0.9 U/L/mg protein/min, respectively. The control medium was altered by adding a metabolic poison (5 mmol/L azide), removing glucose and replacing O2 with N2 to mimic ischemia (in vitro ischemia) and replacing Krebs solution with hypotonic medium to evoke cell lysis. Both azide and in vitro ischemia induced a significant increase in 99mTc-HMPAO release (15.8%+/-3.3% and 18.3%+/-6.2%, respectively), without any modification in LDH efflux. However, only azide reduced the uptake of the tracer. Conversely, glutamate outflow was massive during in vitro ischemia and was far lower during azide treatment. Under hypotonic medium conditions, the release of 99mTc-HMPAO, glutamate and LDH were dramatically increased. Surprisingly, a two-fold increase of 99mTc-HMPAO uptake was also found. When 1 mmol/L glutathione was added to the medium, to convert native lipophilic 99mTc-HMPAO into hydrophilic derivatives, tracer uptake was inhibited both under control and hypotonic medium conditions. CONCLUSION This study provides evidence that not only poisoning of the tissue but also in vitro ischemia induced a reduction of 99mTc-HMPAO retention. Moreover, we demonstrated that injuries causing cell membrane disruption led to hyperfixation of 99mTc-HMPAO.
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Affiliation(s)
- P Colamussi
- Department of Experimental and Clinical Medicine, University of Ferrara, Italy
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18
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Uccelli L, Bolzati C, Boschi A, Duatti A, Morin C, Pasqualini R, Giganti M, Piffanelli A. Design and synthesis of a redox-active Tc-99m radiopharmaceutical with ferrocenedithiocarboxylate [FcCS = Fe(C5H4CS2)(C5H5)-]. Nucl Med Biol 1999; 26:63-7. [PMID: 10096503 DOI: 10.1016/s0969-8051(98)00057-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The synthesis, at tracer level, of two Tc-99m complexes having the same chemical composition and structure, but differing by one electron in the total electron counting, is reported. These compounds have been prepared by reacting [99mTcO4]- with the piperidinium salt of the ligand ferrocenedithiocarboxylate {[Fe(II)(C5H4CS2)(C5H5)]- = FcCS}, in the presence of N-methyl S-methyldithiocarbazate as donor of N3-groups, and triphenylphosphine or SnCl2 as reducing agents. The formation of the neutral complex [99mTc(N)(FcCS)2] (compound A) and of the monocationic, mixed-valence complex [99mTc(N)(FcCS) (FcCS)]+ (compound B) {FcCS = [Fe(III)(C5H4CS2)(C5H5)]} was obtained in high yield. Both complexes comprise a terminal Tc triple bond N multiple bond and two FcCS ligands coordinated to the metal center through the two sulfur atoms of the -CS2 group, but they differ in the oxidation state of one of the two iron atoms of the coordinated FcCS ligands. In complex A, the two Fe atoms are both in the +2 oxidation state, while in B, one Fe atom is in the +2 and the other is in the +3 oxidation state. Thus, B is a mixed-valence Fe(II)-Fe(III) complex. B is easily converted into A by one-electron exchange with various reductants such as triphenylphosphine and excess SnCl2. Biodistribution studies in rats showed that complexes A and B are mostly retained in lungs and liver without any significant uptake in organs such as heart and brain.
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Affiliation(s)
- L Uccelli
- Department of Clinical and Experimental Medicine, University of Ferrara, Italy
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19
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Bolzati C, Uccelli L, Refosco F, Tisato F, Duatti A, Giganti M, Piffanelli A. Labeling and biodistribution studies of Tc-99m radiopharmaceuticals with (o-hydroxyphenyl)diphenylphosphine. Nucl Med Biol 1998; 25:71-6. [PMID: 9466365 DOI: 10.1016/s0969-8051(97)00150-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
New Tc-99m radiopharmaceuticals with the ligand (o-hydroxyphenyl)diphenylphosphine have been prepared and their biodistributions evaluated in rats. The monoxo Tc(V) complex [99mTc(O)Cl(PO)2], the Tc(IV) complex [99mTc(OH)2(PO)2], the Tc(III) complex [99mTc(PO)3], and the nitrido Tc(V) complex [99mTc(N)(PO)2] have been characterized by TLC and HPLC chromatography, and their chemical structure elucidated by comparison with the corresponding complexes obtained using the beta-emitting isotope Tc-99g. Biodistribution studies of these complexes have been carried out in rats.
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Affiliation(s)
- C Bolzati
- Department of Clinical and Experimental Medicine, University of Ferrara, Italy
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Cittanti C, Colamussi P, Giganti M, Orlandi C, Uccelli L, Manfrini S, Azzena G, Piffanelli A. Technetium-99m sestamibi leg scintigraphy for non-invasive assessment of propionyl-L-carnitine induced changes in skeletal muscle metabolism. Eur J Nucl Med 1997; 24:762-6. [PMID: 9211762 DOI: 10.1007/bf00879664] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Carnitine derivatives, such as propionyl-l-carnitine (PLC), have been shown to improve walking distance in patients with obstructive peripheral artery disease (PAOD). The aim of this study was to ascertain whether technetium-99m sestamibi leg scintigraphy may be a useful tool in the evaluation of changes in skeletal muscle metabolism induced by chronic therapy with PLC. Twenty patients with clinical and instrumental evidence of PAOD were randomly assigned to a 3-month period of therapy with either PLC or placebo. Rest 99mTc-sestamibi leg scintigraphy and echo-Doppler sonography were performed on all subjects immediately before and upon completion of the treatment period. At the end of the protocol the following results were observed in patients who underwent PLC administration: (a) a significant increase in both thigh and calf 99mTc-sestamibi uptake, in comparison with baseline values (P<0.001); (b) the absence of statistically significant modifications of Doppler blood flow indices of the lower limbs. In conclusion, after chronic administration of PLC, a significant increment in skeletal muscle uptake of 99mTc-sestamibi was demonstrated without any apparent change in regional blood flow. This fact, if proven in further studies, may suggest a role for this tracer as a non-invasive probe of tissue bioenergetics.
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Affiliation(s)
- C Cittanti
- Department of Nuclear Medicine, University of Ferrara, Italy
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Colamussi P, Trotta F, Ricci R, Cittanti C, Govoni M, Barbarella G, Giganti M, Bajocchi G, Uccelli L, Trevisan C, Piffanelli A. Brain perfusion SPET and proton magnetic resonance spectroscopy in the evaluation of two systemic lupus erythematosus patients with mild neuropsychiatric manifestations. Nucl Med Commun 1997; 18:269-73. [PMID: 9106782 DOI: 10.1097/00006231-199703000-00012] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The diagnosis of central nervous system (CNS) involvement appears to be a major problem in systemic lupus erythematosus (SLE), especially when the clinical signs are non-specific or neuroimaging is unremarkable. Two SLE patients with mild neuropsychiatric manifestations were studied with magnetic resonance imaging (MRI), single photon emission tomography (SPET) and localized proton magnetic resonance spectroscopy (H-1 MRS). MRI was normal in both patients. SPET revealed areas of hypoperfusion in both patients. H-1 MRS demonstrated metabolic abnormalities in the regions corresponding to the hypoperfused areas. A correlation between H-1 MRS and SPET was noted: patients with mild neuropsychiatric SLE may have disturbances evident on SPET and H-1 MRS in the presence of normal anatomy on MRI, suggesting that CNS involvement in SLE has very strong physiological and neurometabolic components in individual patients.
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Affiliation(s)
- P Colamussi
- Department of Nuclear Medicine, St Anna Hospital and University, Ferrara, Italy
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22
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Uccelli L, Giganti M, Duatti A, Bolzati C, Pasqualini R, Cittanti C, Colamussi P, Piffanelli A. Subcellular distribution of technetium-99m-N-NOEt in rat myocardium. J Nucl Med 1995; 36:2075-9. [PMID: 7472602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
UNLABELLED The aim of this study was to determine the subcellular distribution of bis(N-ethoxy N-ethyl)dithiocarbamato nitrido technetium(V) (99mTcN-NOEt) in rat heart by differential centrifugation techniques. Extraction of the activity from homogenized rat heart tissue was also performed to assess whether myocardial retention might induce changes in the chemical identity of the complex. METHODS Anesthetized rats were intravenously injected with 99mTcN-NOEt, the heart tissue was extracted and homogenized and tissue fractions were obtained by differential centrifugation. The efficiency of organelle separation was determined by assay of each centrifugal fraction using enzyme markers. Lactate dehydrogenase (LDH), acid phosphatase (ACP), alkaline phosphatase (ALP) and 5'-nucleotidase (5'ND) activities were assayed using standard spectrophotometric methods. Succinic dehydrogenase (SDH) activity was determined using a p-iodo-nitrotetrazolium-linked assay. Severe cell membrane and organelle disruption were induced by prolonging the homogenization time and their effect on the subcellular distribution of 99mTcN-NOEt was studied. The activity from homogenized heart tissue was extracted using the Folch technique and analyzed by TLC and HPLC. RESULTS Most of the 99mTcN-NOEt activity was found to be associated with the hydrophobic components of the cell. No evidence of specific association of activity with the cytosolic and mitochondrial components was observed. Organelle and membrane cleavage did not cause release of activity into the cytosol. Approximately 90% of 99mTcN-NOEt activity was extracted from ventricular tissue and the chemical nature of 99mTcN-NOEt was not altered by uptake by myocardium. CONCLUSION Cell membranes are the most apparent site of localization of 99mTcN-NOEt in heart tissue.
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Affiliation(s)
- L Uccelli
- Nuclear Medicine Laboratory, University of Ferrara, Italy
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Marchi A, Uccelli L, Magon L, Bonardi M, Gallorini M, Groppi F, Saponaro S. Technetium complexes with ligands of pharmacological interest. J Radioanal Nucl Chem 1995. [DOI: 10.1007/bf02035962] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Scambia G, Catozzi L, Panici P, Ferrandina G, Coronetta F, Barozzi R, Baiocchi G, Uccelli L, Piffanelli A, Mancuso S. Expression of ras oncogene p21 protein in normal and neoplastic ovarian tissues: Correlation with histopathologic features and receptors for estrogen, progesterone, and epidermal growth factor. Int J Gynaecol Obstet 1993. [DOI: 10.1016/0020-7292(93)90309-k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Scambia G, Catozzi L, Panici PB, Ferrandina G, Coronetta F, Barozzi R, Baiocchi G, Uccelli L, Piffanelli A, Mancuso S. Expression of ras oncogene p21 protein in normal and neoplastic ovarian tissues: correlation with histopathologic features and receptors for estrogen, progesterone, and epidermal growth factor. Am J Obstet Gynecol 1993; 168:71-8. [PMID: 8420353 DOI: 10.1016/s0002-9378(12)90888-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
OBJECTIVE The aim of the study was to investigate the biologic significance of p21 expression in normal and neoplastic ovarian tissues. STUDY DESIGN Western blotting analysis of p21/ras oncoprotein was conducted in a group of 14 normal and cystic ovaries, six benign tumors, 42 primary ovarian cancers, and 15 omental metastases. RESULTS Levels of p21 were similar in normal and cystic ovaries and in benign tumors, whereas they were significantly higher in malignant tumors than in control tissues (median 1.91, range 0.12 to 5.00 vs median 1.03, range 0.32 to 2.20; p = 0.023) and in omental metastases than in primary ovarian carcinomas (median 3.05, range 0.55 to 5.72 vs median 1.97, range 0.12 to 5.00; p = 0.14). We found no correlation between p21 expression and histopathologic or clinical characteristics. Estrogen receptor-positive and progesterone receptor-positive tumors expressed higher p21 levels than did estrogen receptor-negative and progesterone receptor-negative tumors (p < 0.05), but no correlation with epidermal growth factor receptor status was found. In the univariate analysis of survival p21 positivity showed a negative prognostic value. CONCLUSION The enhancement of p21 protein is associated in the ovarian tissue with the malignant phenotype and the acquisition of metastatic potential.
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Affiliation(s)
- G Scambia
- Department of Gynecology, Catholic University, Rome, Italy
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Piffanelli A, Pelizzola D, Giovannini G, Catozzi L, Uccelli L, Barozzi R, Giganti M. [Comparison of radiometric, immunometric, and immunohistochemical methods for the determination of hormonal receptors and quality control of other prognostic parameters in the characterization of carcinoma of the breast]. Pathologica 1992; 84:61-4. [PMID: 1363758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023] Open
Affiliation(s)
- A Piffanelli
- Cattedra di Medicina Nucleare, Università di Ferrara
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Marastoni M, Balboni G, Tomatis R, Salvadori S, Borea PA, Uccelli L. Opioid peptides. Partially modified retro-inverso dermorphin analogues. XIII. Farmaco 1989; 44:1083-93. [PMID: 2562001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We studied the effect of partial retro-inverso modification of a selected peptide bond of dermorphin (H-Tyr-D-Ala-Phe-Gly-Tyr-Pro-Ser-NH2) related peptides. The drastic loss of mu-receptor affinity following introduction of retro-inverso peptide bond between Phe1-D-Ala2 in the new peptide analogues, emphasized the importance of this backbone in the dermorphin peptides.
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Affiliation(s)
- M Marastoni
- Dipartimento di Scienze Farmaceutiche, Università di Ferrara, Italy
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