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Blanc A, Todorovic M, Dude I, Merkens H, Bénard F, Perrin DM. Toward tryptathionine-stapled one-bead-one-compound (OBOC) libraries: solid phase synthesis of a bioactive octretoate analog. Org Biomol Chem 2023; 21:8112-8116. [PMID: 37772608 DOI: 10.1039/d3ob01378b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/30/2023]
Abstract
New somatostatin analogs are highly desirable for diagnosing and treating neuroendocrine tumors (NETs). Here we describe the solid-phase synthesis of a new octreotate (TATE) analog where the disulfide bond is replaced with a tryptathionine (Ttn) staple as part of an effort to prototyping a one-bead-one-compound (OBOC) library of Ttn-stapled peptides. Library design provides the potential for on- and off-bead screening. To validate our method, we labelled Ttn-TATE with a fluorescent dye to demonstrate binding to soluble somatostatin receptor subtype-2 and staining of Ar42J rat prostate cancer cells. By exploring this staple in the context of a ligand of known affinity, this method paves the way for an OBOC library construction of bioactive octreotate analogs and, more broadly speaking, tryptathionine-staped peptide macrocycles.
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Affiliation(s)
- Antoine Blanc
- Chemistry Department, UBC, 2036 Main Mall, Vancouver, V6T-1Z1, Canada.
| | - Mihajlo Todorovic
- Chemistry Department, UBC, 2036 Main Mall, Vancouver, V6T-1Z1, Canada.
| | - Iulia Dude
- Molecular Oncology, British Columbia Cancer Agency Research Centre, 675 West10th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - Helen Merkens
- Molecular Oncology, British Columbia Cancer Agency Research Centre, 675 West10th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - François Bénard
- Molecular Oncology, British Columbia Cancer Agency Research Centre, 675 West10th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - David M Perrin
- Chemistry Department, UBC, 2036 Main Mall, Vancouver, V6T-1Z1, Canada.
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Pivonello R, Munster PN, Terzolo M, Ferrigno R, Simeoli C, Puglisi S, Bali U, Moraitis AG. Glucocorticoid Receptor Antagonism Upregulates Somatostatin Receptor Subtype 2 Expression in ACTH-Producing Neuroendocrine Tumors: New Insight Based on the Selective Glucocorticoid Receptor Modulator Relacorilant. Front Endocrinol (Lausanne) 2021; 12:793262. [PMID: 35058882 PMCID: PMC8764187 DOI: 10.3389/fendo.2021.793262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 11/22/2021] [Indexed: 12/29/2022] Open
Abstract
Somatostatin exhibits an inhibitory effect on pituitary hormone secretion, including inhibition of growth hormone and adrenocorticotropic hormone (ACTH), and it can have antisecretory and antitumor effects on neuroendocrine tumors (NETs) that express somatostatin receptors. Although the precise mechanism remains unclear, the finding that glucocorticoids downregulate somatostatin receptor subtype 2 (SSTR2) expression has been used to explain the lack of efficacy of traditional SSTR2-targeting analogs in patients with ACTH-secreting NETs. Glucocorticoid receptor (GR) antagonism with mifepristone has been shown to reverse the glucocorticoid-induced downregulation of SSTR2; however, the effects of GR modulation on SSTR2 expression in ACTH-secreting NETs, particularly corticotroph pituitary tumors, are not well known. The current study presents new insight from in vitro data using the highly selective GR modulator relacorilant, showing that GR modulation can overcome dexamethasone-induced suppression of SSTR2 in the murine At-T20 cell line. Additional data presented from clinical case observations in patients with ACTH-secreting NETs suggest that upregulation of SSTR2 via GR modulation may re-sensitize tumors to endogenous somatostatin and/or somatostatin analogs. Clinical, laboratory, and imaging findings from 4 patients [2 ACTH-secreting bronchial tumors and 2 ACTH-secreting pituitary tumors (Cushing disease)] who were treated with relacorilant as part of two clinical studies (NCT02804750 and NCT02762981) are described. In the patients with ectopic ACTH secretion, SSTR2-based imaging (Octreoscan and 68Ga-DOTATATE positron emission tomography) performed before and after treatment with relacorilant showed increased radiotracer uptake by the tumor following treatment with relacorilant without change in tumor size at computed tomography. In the patients with Cushing disease who received relacorilant prior to scheduled pituitary surgery, magnetic resonance imaging after a 3-month course of relacorilant showed a reduction in tumor size. Based on these findings, we propose that GR modulation in patients with ACTH-secreting NETs upregulates previously suppressed SSTR2s, resulting in tumor-specific antisecretory and anti-proliferative effects. The effect of relacorilant on pituitary corticotroph tumors is being investigated in an ongoing phase 3 study (NCT03697109; EudraCT 2018-003096-35).
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Affiliation(s)
- Rosario Pivonello
- Dipartimento di Medicina Clinica e Chirurgia, Sezione di Endocrinologia, Università Federico Il di Napoli, Naples, Italy
| | - Pamela N. Munster
- Department of Medicine (Hematology/Oncology), University of California San Francisco, San Francisco, CA, United States
| | - Massimo Terzolo
- Department of Clinical and Biological Sciences, San Luigi Gonzaga Hospital, University of Turin, Orbassano, Italy
| | - Rosario Ferrigno
- Dipartimento di Medicina Clinica e Chirurgia, Sezione di Endocrinologia, Università Federico Il di Napoli, Naples, Italy
| | - Chiara Simeoli
- Dipartimento di Medicina Clinica e Chirurgia, Sezione di Endocrinologia, Università Federico Il di Napoli, Naples, Italy
| | - Soraya Puglisi
- Department of Clinical and Biological Sciences, San Luigi Gonzaga Hospital, University of Turin, Orbassano, Italy
| | - Utsav Bali
- Bioscience Department, Sygnature Discovery Ltd, Nottingham, United Kingdom
| | - Andreas G. Moraitis
- Drug Research and Development, Corcept Therapeutics, Menlo Park, CA, United States
- *Correspondence: Andreas G. Moraitis,
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Inzani F, Santoro A, Angelico G, Feraco A, Spadola S, Arciuolo D, Valente M, Carlino A, Piermattei A, Scaglione G, Scambia G, Rindi G, Zannoni GF. Neuroendocrine Carcinoma of the Uterine Cervix: A Clinicopathologic and Immunohistochemical Study with Focus on Novel Markers (Sst2-Sst5). Cancers (Basel) 2020; 12:cancers12051211. [PMID: 32408525 PMCID: PMC7281076 DOI: 10.3390/cancers12051211] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/06/2020] [Accepted: 05/06/2020] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Gynecological neuroendocrine neoplasms (NENs) are extremely rare, accounting for 1.2-2.4% of the NENs. The aim of this study was to test cervical NENs for novel markers of potential utility for differential diagnosis and target therapy. METHODS All cases of our center (n = 16) were retrieved and tested by immunohistochemistry (IHC) for 12 markers including markers of neuroendocrine differentiation (chromogranin A, synaptophysin, CD56), transcription factors (CDX2 and TTF1), proteins p40, p63, p16INK4a, and p53, somatostatin receptors subtypes (SST2-SST5) and the proliferation marker Ki67 (MIB1). RESULTS All cases were poorly differentiated neuroendocrine carcinomas (NECs), 10 small cell types (small cell-neuroendocrine carcinomas, SCNECs) and 6 large cell types (large cell-neuroendocrine carcinomas, LCNECs); in 3 cases a predominant associated adenocarcinoma component was observed. Neuroendocrine cancer cells expressed at least 2 of the 3 tested neuroendocrine markers; p16 was intensely expressed in 14 (87.5%) cases; SST5 in 11 (56.25%, score 2-3, in 9 cases); SST2 in 8 (50%, score 2-3 in 8), CDX2 in 8 (50%), TTF1 in 5 (31.25%), and p53 in 1 case (0.06%). P63 and p40 expressions were negative, with the exception of one case that showed moderate expression for p63. CONCLUSIONS P40 is a more useful marker for the differential diagnosis compared to squamous cell carcinoma. Neither CDX2 nor TTF1 expression may help the differential diagnosis versus potential cervical metastasis. P16 expression may suggest a cervical origin of NEC; however, it must be always integrated by clinical and instrumental data. The expression of SST2 and SST5 could support a role for SSAs (Somatostatin Analogues) in the diagnosis and therapy of patients with cervical NECs.
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Affiliation(s)
- Frediano Inzani
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
- ENETS Center of Excellence, Neuroendocrine Tumour (NET) Center, 00168 Rome, Italy
| | - Angela Santoro
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
| | - Giuseppe Angelico
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
| | - Angela Feraco
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
| | - Saveria Spadola
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
| | - Damiano Arciuolo
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
| | - Michele Valente
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
| | - Angela Carlino
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
| | - Alessia Piermattei
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
| | - Giulia Scaglione
- Department of Surgical and Diagnostic Sciences, IRCCS Ospedale Policlinico San Martino, 16100 Genoa, Italy;
| | - Giovanni Scambia
- Oncological Gynaecology Unit, Department of Woman, Child and Public Health Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy;
- Obstetric and Gynecologic Clinic Institute, Catholic University of Sacred Hearth, 00168 Rome, Italy
| | - Guido Rindi
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
- ENETS Center of Excellence, Neuroendocrine Tumour (NET) Center, 00168 Rome, Italy
- Pathological Anatomy Institute, Catholic University of Sacred Hearth, 00168 Rome, Italy
| | - Gian Franco Zannoni
- Department of Woman, Child and Public Health Sciences, Gynecopathology and Breast Pathology Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy; (F.I.); (A.S.); (G.A.); (A.F.); (S.S.); (D.A.); (M.V.); (A.C.); (A.P.); (G.R.)
- Pathological Anatomy Institute, Catholic University of Sacred Hearth, 00168 Rome, Italy
- Correspondence:
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