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Ortiz J, Teruel JA, Aranda FJ, Ortiz A. On the Mechanism of Membrane Permeabilization by Tamoxifen and 4-Hydroxytamoxifen. MEMBRANES 2023; 13:292. [PMID: 36984678 PMCID: PMC10058083 DOI: 10.3390/membranes13030292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 02/17/2023] [Accepted: 02/27/2023] [Indexed: 06/18/2023]
Abstract
Tamoxifen (TMX), commonly used in complementary therapy for breast cancer, also displays known effects on the structure and function of biological membranes. This work presents an experimental and simulation study on the permeabilization of model phospholipid membranes by TMX and its derivative 4-hydroxytamoxifen (HTMX). TMX induces rapid and extensive vesicle contents leakage in phosphatidylcholine (PC) liposomes, with the effect of HTMX being much weaker. Fitting of the leakage curves for TMX, yields two rate constants, corresponding to a fast and a slow process, whereas in the case of HTMX, only the slow process takes place. Interestingly, incorporation of phosphatidylglycerol (PG) or phosphatidylethanolamine (PE) protects PC membranes from TMXinduced permeabilization. Fourier-transform infrared spectroscopy (FTIR) shows that, in the presence of TMX there is a shift in the νCH2 band frequency, corresponding to an increase in gauche conformers, and a shift in the νC=O band frequency, indicating a dehydration of the polar region. A preferential association of TMX with PC, in mixed PC/PE systems, is observed by differential scanning calorimetry. Molecular dynamics (MD) simulations support the experimental results, and provide feasible explanations to the protecting effect of PG and PE. These findings add new information to explain the various mechanisms of the anticancer actions of TMX, not related to the estrogen receptor, and potential side effects of this drug.
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Anticancer drugs tamoxifen and 4hydroxytamoxifen as effectors of phosphatidylethanolamine lipid polymorphism. Chem Phys Lipids 2022; 248:105239. [PMID: 36075353 DOI: 10.1016/j.chemphyslip.2022.105239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 08/31/2022] [Accepted: 09/01/2022] [Indexed: 01/25/2023]
Abstract
The interaction of tamoxifen (TMX) and its metabolite 4-hydroxytamoxifen (HTMX) with a biomimetic membrane model system composed of 1,2-dielaidoylphosphatidylethanolamine (DEPE) has been studied using a biophysical approach. Incorporation of TMX into DEPE bilayers gives rise to a progressive broadening of the Lβ/Lα phase transition and a downward temperature shift. The Lβ/Lα phase transition presents multiple endotherms, indicating a lateral segregation of TMX/DEPE domains within the plane of the bilayer. TMX and HTMX also widen and shift the Lα to hexagonal-HII transition toward lower values, the phase diagrams showing that both compounds facilitate formation of the HII phase. TMX increases motional disorder of DEPE acyl chains in the Lβ, Lα and HII phases, whereas the effect of HTMX is clearly different. In addition, neither TMX nor HTMX significantly perturb the hydration state of the polar headgroup region of DEPE. Molecular dynamics (MD) simulations indicate that these drugs do not affect membrane thickness, area per lipid, or the conformation of DEPE molecules. As a general rule, the interaction of HTMX with DEPE is qualitatively similar to TMX but less intense. However, a significant difference shown by MD is that HTMX is mainly placed around the center of each monolayer while TMX is located mainly at the center of the membrane, also having a greater tendency to cluster formation. These results are discussed to understand the modulation of phosphatidylethanolamine lipid polymorphism carried out by these drugs, which could be of relevance to explain their effects on enzyme activity or membrane permeabilization.
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Sabih QA, Young J, Takabe K. Management of Male Breast Cancer: The Journey so Far and Future Directions. World J Oncol 2022; 12:206-213. [PMID: 35059080 PMCID: PMC8734504 DOI: 10.14740/wjon1418] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 11/26/2021] [Indexed: 11/13/2022] Open
Abstract
Male breast cancer is now shown to be a unique entity and should be considered as a distinct disease. Given the relatively smaller number of cases, randomized controlled trials for treatment are extremely limited and majority of practices are derived from female breast cancer studies. This paper reviews available literature on surgical, radiation, and systemic therapies for male breast cancer, and discusses current practice recommendations.
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Affiliation(s)
- Quratulain Anna Sabih
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Jessica Young
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Kazuaki Takabe
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA.,Department of Surgery, University at Buffalo Jacobs School of Medicine and Biomedical Sciences, the State University of New York, Buffalo, NY, USA.,Department of Breast Surgery and Oncology, Tokyo Medical University, Tokyo 160-8402 Japan.,Department of Gastroenterological Surgery, Yokohama City University School of Medicine, Yokohama 236-004, Japan.,Department of Surgery, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510 Japan.,Department of Breast Surgery, Fukushima Medical University, Fukushima, Japan
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Ortiz J, Aranda FJ, Teruel JA, Ortiz A. Dissimilar action of tamoxifen and 4-hydroxytamoxifen on phosphatidylcholine model membranes. Biophys Chem 2021; 278:106681. [PMID: 34530285 DOI: 10.1016/j.bpc.2021.106681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/03/2021] [Accepted: 09/06/2021] [Indexed: 11/19/2022]
Abstract
The anticancer drug tamoxifen and its primary metabolite 4-hydroxytamoxifen tend to accumulate in membranes due to its strong hydrophobic character. Thus, in this work we have carried out a systematic study to investigate their effects on model phosphatidylcholine membranes. Tamoxifen and 4-hydroxytamoxifen affect the phase behaviour of phosphatidylcholine model membranes, giving rise to formation of drug/dipalmitoylphosphatidylcholine domains, which is more evident in the case of 4-hydroxytamoxifen. These drugs have differential effects on the polar and apolar regions of the phospholipid supporting a different location of both compounds within the bilayer. Both compounds induce contents leakage in fluid phosphatidylcholine unilamellar liposomes, the effect of 4-hydroxytamoxifen being negligible as compared to that of tamoxifen. Molecular dynamics confirmed the tendency of both drugs to form clusters, tamoxifen locating all along the bilayer, whereas 4-hydroxytamoxifen mostly locates near the lipid/water interface, which can explain the different effects of both drugs in fluid phosphatidylcholine membranes.
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Affiliation(s)
- Julia Ortiz
- Departamento de Bioquímica y Biología Molecular-A, Facultad de Veterinaria, Universidad de Murcia, Campus de Espinardo, E-30100 Murcia, Spain
| | - Francisco J Aranda
- Departamento de Bioquímica y Biología Molecular-A, Facultad de Veterinaria, Universidad de Murcia, Campus de Espinardo, E-30100 Murcia, Spain
| | - José A Teruel
- Departamento de Bioquímica y Biología Molecular-A, Facultad de Veterinaria, Universidad de Murcia, Campus de Espinardo, E-30100 Murcia, Spain
| | - Antonio Ortiz
- Departamento de Bioquímica y Biología Molecular-A, Facultad de Veterinaria, Universidad de Murcia, Campus de Espinardo, E-30100 Murcia, Spain.
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Yalaza M, İnan A, Bozer M. Male Breast Cancer. THE JOURNAL OF BREAST HEALTH 2016; 12:1-8. [PMID: 28331724 DOI: 10.5152/tjbh.2015.2711] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 11/03/2015] [Indexed: 12/24/2022]
Abstract
Male breast cancer (MBC) is a rare disease, accounting for less than 1% of all breast cancer diagnoses worldwide. Although breast carcinomas share certain characteristics in both genders, there are notable differences. Most studies on men with breast cancer are very small. Thus, most data on male breast cancer are derived from studies on females. However, when a number of these small studies are grouped together, we can learn more from them. This review emphasizes the incidence, etiology, clinical features, diagnosis, treatment, pathology, survival, and prognostic factors related to MBC.
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Affiliation(s)
- Metin Yalaza
- Clinic of Surgical Oncology, Konya Training and Research Hospital, Konya, Turkey
| | - Aydın İnan
- Department of General Surgery, Turgut Özal University Faculty of Medicine, Ankara, Turkey
| | - Mikdat Bozer
- Department of General Surgery, Division of Surgical Oncology, Fatih University Faculty of Medicine, İstanbul, Turkey
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Baumgärtner AK, Schnelzer AC, Harbeck N, Kiechle M, von Steinburg SP. Endocrine Combination Therapy for Prostate and Metastatic Breast Cancer in a Male Patient. Breast Care (Basel) 2007. [DOI: 10.1159/000099233] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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MESH Headings
- Aged
- Aged, 80 and over
- Breast Neoplasms, Male/pathology
- Breast Neoplasms, Male/surgery
- Carcinoma, Ductal, Breast/pathology
- Carcinoma, Ductal, Breast/surgery
- Carcinoma, Intraductal, Noninfiltrating/pathology
- Carcinoma, Intraductal, Noninfiltrating/surgery
- Humans
- Male
- Neoplasm Staging
- Neoplasms, Multiple Primary/pathology
- Neoplasms, Multiple Primary/surgery
- Treatment Outcome
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Leonard B. Women's conditions occurring in men: breast cancer, osteoporosis, male menopause, and eating disorders. Nurs Clin North Am 2004; 39:379-93. [PMID: 15159186 DOI: 10.1016/j.cnur.2004.01.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Each of the four disorders discussed in this article emphasizes its significance in the morbidity and mortality of men. Recent research has improved the ability to identify many of the key risk factors that could predispose men to breast cancer, osteoporosis, male menopause, and eating disorders. There is a significant need for further research into each of these conditions, as most studies have been conducted on women. The myths that these disorders are just a feminist issue can be ignored no longer. Nurses are in a prime position to help men identify and analyze their risks and help them select appropriate prevention and screening strategies to improve their knowledge and quality of life.
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Affiliation(s)
- Bruce Leonard
- University of Texas Medical Branch School of Nursing, 301 University Boulevard, Galveston, TX 77555-1029, USA.
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Italiano A, Largillier R, Marcy PY, Foa C, Ferrero JM, Hartmann MT, Namer M. [Complete remission obtained with letrozole in a man with metastatic breast cancer]. Rev Med Interne 2004; 25:323-4. [PMID: 15050804 DOI: 10.1016/j.revmed.2003.12.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2003] [Accepted: 12/05/2003] [Indexed: 10/26/2022]
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Long-Term and Tight Control of Gene Expression in Mouse Skeletal Muscle by a New Hybrid Human Transcription Factor. Mol Ther 2002. [DOI: 10.1006/mthe.2002.0717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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