1
|
Amal G, Sara T, Ghofrane CS, Malika AI, Majdouline H, Souha S, Abdelatif B, Najoua T, Ghita B, Zineb B, Nabil C. [Cutaneous Merkel cell carcinoma: role of 18FDG PET-CT]. Pan Afr Med J 2016; 23:156. [PMID: 27303574 PMCID: PMC4894725 DOI: 10.11604/pamj.2016.23.156.8571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Accepted: 03/15/2016] [Indexed: 11/11/2022] Open
Abstract
Merkel cell carcinoma (MCC) is a rare neuroendocrine carcinoma of the skin with unpredictable evolution and high metastatic potential. This neoplasm usually occurs in the elderly on their sun-exposed areas. CCM constant greed for 18 fluorodeoxyglucose (FDG) defines the role of positron emission tomography (PET) in this pathology. However, no consensus has yet been reached. This study reports the case of a 25 year old woman treated for metastatic MCC, in order to draw attention to this particular tumor and to illustrate the role of 18 FDG PET in the management of this rare entity.
Collapse
Affiliation(s)
- Guensi Amal
- Service de Médecine Nucléaire, CHU Ibn Rochd, Rabat, Maroc
| | - Taleb Sara
- Service de Médecine Nucléaire, CHU Ibn Rochd, Rabat, Maroc
| | | | | | | | - Sahraoui Souha
- Service d'Oncologie Radiothérapie, CHU Ibn Rochd, Rabat, Maroc
| | | | - Touil Najoua
- Service de Radiologie des Urgences, CHU Ibn Rochd, Rabat, Maroc Taleb Sara, Service de Médecine Nucléaire, CHU Ibn Rochd, Rabat, Maroc
| | - Benmoussa Ghita
- Service de Radiologie des Urgences, CHU Ibn Rochd, Rabat, Maroc Taleb Sara, Service de Médecine Nucléaire, CHU Ibn Rochd, Rabat, Maroc
| | - Baroudi Zineb
- Service de Radiologie des Urgences, CHU Ibn Rochd, Rabat, Maroc Taleb Sara, Service de Médecine Nucléaire, CHU Ibn Rochd, Rabat, Maroc
| | - Chikhaoui Nabil
- Service de Radiologie des Urgences, CHU Ibn Rochd, Rabat, Maroc Taleb Sara, Service de Médecine Nucléaire, CHU Ibn Rochd, Rabat, Maroc
| |
Collapse
|
2
|
Chemes LB, Noval MG, Sánchez IE, de Prat-Gay G. Folding of a cyclin box: linking multitarget binding to marginal stability, oligomerization, and aggregation of the retinoblastoma tumor suppressor AB pocket domain. J Biol Chem 2013; 288:18923-38. [PMID: 23632018 DOI: 10.1074/jbc.m113.467316] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The retinoblastoma tumor suppressor (Rb) controls the proliferation, differentiation, and survival of cells in most eukaryotes with a role in the fate of stem cells. Its inactivation by mutation or oncogenic viruses is required for cellular transformation and eventually carcinogenesis. The high conservation of the Rb cyclin fold prompted us to investigate the link between conformational stability and ligand binding properties of the RbAB pocket domain. RbAB unfolding presents a three-state transition involving cooperative secondary and tertiary structure changes and a partially folded intermediate that can oligomerize. The first transition corresponds to unfolding of the metastable B subdomain containing the binding site for the LXCXE motif present in cellular and viral targets, and the second transition corresponds to the stable A subdomain. The low thermodynamic stability of RbAB translates into a propensity to rapidly oligomerize and aggregate at 37 °C (T50 = 28 min) that is suppressed by human papillomavirus E7 and E2F peptide ligands, suggesting that Rb is likely stabilized in vivo through binding to target proteins. We propose that marginal stability and associated oligomerization may be conserved for function as a "hub" protein, allowing the formation of multiprotein complexes, which could constitute a robust mechanism to retain its cell cycle regulatory role throughout evolution. Decreased stability and oligomerization are shared with the p53 tumor suppressor, suggesting a link between folding and function in these two essential cell regulators that are inactivated in most cancers and operate within multitarget signaling pathways.
Collapse
Affiliation(s)
- Lucía B Chemes
- Protein Structure-Function and Engineering Laboratory, Fundación Instituto Leloir and Instituto de Investigaciones Bioquímicas de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Patricias Argentinas 435, 1405 Buenos Aires, Argentina
| | | | | | | |
Collapse
|
3
|
Current World Literature. Curr Opin Oncol 2012; 24:197-202. [DOI: 10.1097/cco.0b013e32835164ff] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|