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Su Z, Lu C, Zhang F, Liu H, Li M, Qiao M, Zou X, Luo D, Li H, He M, Se H, Jing J, Wang X, Yang H, Yang H. Cancer-associated fibroblasts-secreted exosomal miR-92a-3p promotes tumor growth and stemness in hepatocellular carcinoma through activation of Wnt/β-catenin signaling pathway by suppressing AXIN1. J Cell Physiol 2024. [PMID: 38949237 DOI: 10.1002/jcp.31344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Revised: 05/29/2024] [Accepted: 06/11/2024] [Indexed: 07/02/2024]
Abstract
Cancer-associated fibroblasts (CAFs) are a major cellular component in the tumor microenvironment and have been shown to exhibit protumorigenic effects in hepatocellular carcinoma (HCC). This study aimed to delve into the mechanisms underlying the tumor-promoting effects of CAFs in HCC. Small RNA sequencing was conducted to screen differential expressed microRNAs in exosomes derived from CAFs and normal fibroblasts (NFs). The miR-92a-3p expression was then measured using reverse transcriptase quantitative real-time PCR in CAFs, NFs, CAFs-derived exosomes (CAFs-Exo), and NF-derived exosomes (NFs-Exo). Compared to NFs or NF-Exo, CAFs and CAFs-Exo significantly promoted HCC cell proliferation, migration, and stemness. Additionally, compared to NFs or NF-Exo, miR-92a-3p level was notably higher in CAFs and CAFs-Exo, respectively. Exosomal miR-92a-3p was found to enhance HCC cell proliferation, migration, and stemness. Meanwhile, AXIN1 was targeted by miR-92a-3p. Exosomal miR-92a-3p could activate β-catenin/CD44 signaling in HCC cells by inhibiting AXIN1 messenger RNA. Furthermore, in vivo studies verified that exosomal miR-92a-3p notably promoted tumor growth and stemness through targeting AXIN1/β-catenin axis. Collectively, CAFs secreted exosomal miR-92a-3p was capable of promoting growth and stemness in HCC through activation of Wnt/β-catenin signaling pathway by suppressing AXIN1. Therefore, targeting CAFs-derived miR-92a-3p may be a potential strategy for treating HCC.
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Affiliation(s)
- Zenong Su
- Department of Oncology, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Institute of Cancer, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Department of Graduate School, Baotou Medical College, Baotou, Inner Mongolia Autonomous Region, China
| | - Chao Lu
- Department of Oncology, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Institute of Cancer, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Department of Graduate School, Inner Mongolia Medical University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Feifei Zhang
- Department of Nuclear Medicine, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Huan Liu
- Department of Oncology, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Institute of Cancer, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Department of Graduate School, Inner Mongolia Medical University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Meiqing Li
- Department of Oncology, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Institute of Cancer, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Meng Qiao
- Department of Oncology, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Institute of Cancer, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Xiaohong Zou
- Department of Oncology, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Institute of Cancer, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Danyang Luo
- Department of Oncology, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Institute of Cancer, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Haojing Li
- Department of Oncology, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Institute of Cancer, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Min He
- Department of Oncology, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Institute of Cancer, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Han Se
- Department of Graduate School, Baotou Medical College, Baotou, Inner Mongolia Autonomous Region, China
| | - Jing Jing
- Department of Graduate School, Inner Mongolia Medical University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Xiangcheng Wang
- Department of Nuclear Medicine, Shenzhen People's Hospital, Shenzhen, Guangzhou, China
| | - Hao Yang
- Department of Radiation Oncology, Peking University Cancer Hospital (Inner Mongolia Campus) & Affiliated Cancer Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia Autonomous Region, China
| | - Hong Yang
- Department of Oncology, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
- Institute of Cancer, Inner Mongolia People's Hospital, People's Hospital of Inner Mongolia University, Hohhot, Inner Mongolia Autonomous Region, China
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Zorlu Ö, Karabağ S, Erdoğan KE, Aksın M, Üstün B. Immunoexpression Patterns of Adhesion Molecules (E-cadherin, β-catenin, CD56) and Cytokeratins (CK19, CK20, HMWCK, CAM5.2) During Hair Development in Human Fetuses Compared With Adults. Am J Dermatopathol 2024:00000372-990000000-00358. [PMID: 38842366 DOI: 10.1097/dad.0000000000002741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
ABSTRACT Abnormalities in the expression of cytokeratins or adhesion molecules have been associated with hair disorders. The expression patterns of these molecules in the hair follicles of developing human fetuses are not obvious. We aimed to investigate the expression patterns of some cytokeratins and adhesion molecules in the hair follicle of human fetuses and compared them with adults. Forty-eight fetuses of >16 gestational weeks and 22 adult cases with total excisions of benign nevi or cysts were enrolled. The skin samples were taken from both the scalp and back of the fetuses. The histopathologically normal skin areas were evaluated in adults. CK19, CK20, CAM5.2, high-molecular-weight cytokeratin, E-cadherin, β-catenin, and CD56 immunohistochemical stainings were performed. In the fetus group, the staining scores declined in the third trimester but elevated and reached the highest level in adults, except for CD56, which did not stain any adult samples. All stainings were mostly observed in the outer root sheath, except CD56 that stained the perifollicular dermal sheath only in fetuses. E-cadherin, β-catenin, and high-molecular-weight cytokeratin strongly and diffusely stained all adult samples. CAM5.2 and CK19 scores were correlated in fetuses (scalp scores: rs = 0.405, P = 0.004; back scores: rs = 0.422, P = 0.003) and adults (back scores: rs = 0.562, P = 0.046). CD56 negativity indicated the immune-privilege feature of adult hair follicles. As CK19, CAM5.2 may be used to find the regions of stem cells or transient amplifying cells.
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Affiliation(s)
- Özge Zorlu
- Department of Dermatology and Venereology, Tekirdağ Namık Kemal University Faculty of Medicine, Tekirdağ, Turkey
| | - Sevil Karabağ
- Department of Pathology, Tekirdağ Namık Kemal University Faculty of Medicine, Tekirdağ, Turkey
| | - Kıvılcım E Erdoğan
- Department of Pathology, Çukurova University Faculty of Medicine, Adana, Turkey
| | - Merve Aksın
- Department of Pathology, Çukurova University Faculty of Medicine, Adana, Turkey; and
| | - Batuhan Üstün
- Department of Obstetrics and Gynecology, Tekirdağ Namık Kemal University Faculty of Medicine, Tekirdağ, Turkey
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Alkul S, Nguyen CN, Ramani NS, Alkul M, Orengo I, Shimizu I, Krishnan B. Squamous cell carcinoma arising in an epidermal inclusion cyst. Proc AMIA Symp 2022; 35:688-690. [DOI: 10.1080/08998280.2022.2077600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Affiliation(s)
- Suzanne Alkul
- Department of Dermatology, Baylor College of Medicine, Houston, Texas
| | | | - Nisha S. Ramani
- Department of Pathology, Michael E. DeBakey VA Medical Center, Houston, Texas
| | - Mahmud Alkul
- School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Ida Orengo
- Department of Dermatology, Baylor College of Medicine, Houston, Texas
| | - Ikue Shimizu
- Department of Dermatology, Michael E. DeBakey VA Medical Center, Houston, Texas
| | - Bhuvaneswari Krishnan
- Baylor College of Medicine, Houston, Texas
- Department of Pathology, Michael E. DeBakey VA Medical Center, Houston, Texas
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Wydadi O, Bijou W, Laachoubi M, Oukessou Y, Roubal M, Mahtar M. Huge pilomatrixomas of the scalp: A case report. Int J Surg Case Rep 2021; 84:106048. [PMID: 34174742 PMCID: PMC8234360 DOI: 10.1016/j.ijscr.2021.106048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 05/25/2021] [Accepted: 05/26/2021] [Indexed: 11/17/2022] Open
Abstract
Pilomatrixoma is a rare benign skin tumor differentiating toward hair matrix cells usually encountered in the head and neck region. It is most frequently appearing in the first and second decades of life. Histopathological examination is essential to make definitive diagnosis. Herein, we present an atypical case of multiple pilomatrixomas. A 69-year-old man with multiple voluminous masses over the scalp. Among the three lesions, one was clinically suspicious for malignancy, it measured 17 cm and was ulcerated in places. Histopathology confirmed the diagnosis of pilomatrixoma. The tumors were removed surgically with free margins. Otolaryngologist should be familiar with this benign tumor when evaluating soft-tissue mass in the head and neck region. Pilomatrixoma, is a particular and uncommon type benign subcutaneous tumors arising from the cutaneous adnexa. Otolaryngologist should be familiar with this benign tumor when evaluating soft-tissue mass in the head and neck region. Clinical follow-up of these lesions is necessary to avoid recurrence and malignant transformation.
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Affiliation(s)
- Omar Wydadi
- ENT Department, Face and Neck Surgery, Hospital August, 20, 1953, University Hospital Center IBN ROCHD, Casablanca, Morocco
| | - Walid Bijou
- ENT Department, Face and Neck Surgery, Hospital August, 20, 1953, University Hospital Center IBN ROCHD, Casablanca, Morocco
| | - Mohammed Laachoubi
- ENT Department, Face and Neck Surgery, Hospital August, 20, 1953, University Hospital Center IBN ROCHD, Casablanca, Morocco.
| | - Youssef Oukessou
- ENT Department, Face and Neck Surgery, Hospital August, 20, 1953, University Hospital Center IBN ROCHD, Casablanca, Morocco; Faculty of Medicine and Pharmacy, Hassan II University of Casablanca, B.P 5696, Casablanca, Morocco
| | - Mohammed Roubal
- ENT Department, Face and Neck Surgery, Hospital August, 20, 1953, University Hospital Center IBN ROCHD, Casablanca, Morocco; Faculty of Medicine and Pharmacy, Hassan II University of Casablanca, B.P 5696, Casablanca, Morocco
| | - Mohammed Mahtar
- ENT Department, Face and Neck Surgery, Hospital August, 20, 1953, University Hospital Center IBN ROCHD, Casablanca, Morocco; Faculty of Medicine and Pharmacy, Hassan II University of Casablanca, B.P 5696, Casablanca, Morocco
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Abstract
Pilomatrixoma, an uncommon, usually benign cutaneous appendageal tumor, shows differentiation toward the hair follicle matrix cell. It undergoes various histopathologic stages, early on displaying epithelial and shadow cells along with granulomatous inflammation. In later stages, illustrated by this unusual case, epithelial cells disappear and are replaced by calcification and ossification. Immunohistochemistry in the current case showed transitional cell reactivity for β-catenin, probably linking the tumor to a mutation in the β-catenin gene CTNNB1. There was also transitional cell positivity for cyclin D1, a marker found in matrical cells of the human hair follicle. While pilomatrixoma occurs occasionally in the eyelid, the ossified eyelid variant in the current case is very rare, with only one preceding description in the literature.
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Martin S, DeJesus J, Jacob A, Qvavadze T, Guerrieri C, Hudacko R, Boucree T. Pilomatrix carcinoma of the right postauricular region: A case report and literature review. Int J Surg Case Rep 2019; 65:284-287. [PMID: 31756690 PMCID: PMC6872857 DOI: 10.1016/j.ijscr.2019.10.087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 10/31/2019] [Indexed: 12/04/2022] Open
Abstract
Pilomatrix carcinoma is a very rare locally aggressive tumor. A well-defined gold standard for surgical management has not been established. Currently wide local excision with safe margins is recommended. Regional lymph node dissection is performed when metastasis is suspected.
Introduction Pilomatrix carcinoma is a rare aggressive tumor with a high rate of local recurrence after surgical excision. Diagnosis is made by histopathology and when discovered, wide local excision has been shown to have the best results. Presentation of case We report a case of a 74-year-old male incidentally found to have a large right postauricular mass and regional lymphadenopathy. The mass was biopsied and proven to be a malignant pilomatrixoma. Wide local excision and level II and III neck dissection with reconstruction using a right supraclavicular flap was performed. Discussion Pilomatrix carcinoma is a lesion first described in 1880 by Malherbe and Chenantais. It is unknown if these tumors arise de novo or arise through malignant transformation of a benign pilomatrixoma. There are similarities between the benign lesion and its malignant counterpart in terms of activating mutations in signaling pathways. A well-defined gold standard for surgical management has not been established, but currently wide local excision with safe margins is recommended along with regional lymph node dissection when metastasis is suspected. Currently, no chemotherapy regimen has been shown to be effective in local control or in preventing metastatic spread. Conclusion Pilomatrix carcinoma, given its aggressive nature, has a high propensity for recurrence after excision. It is important to perform wide local excision to avoid an incomplete resection and higher recurrence rates. Further studies will be needed to create a more defined standard of treatment and to evaluate the role of adjuvant chemotherapy and radiation therapy.
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Affiliation(s)
- Shabiah Martin
- Newark Beth Israel Medical Center, 201 Lyons Ave, Newark, NJ 07112, USA.
| | - Jana DeJesus
- Newark Beth Israel Medical Center, 201 Lyons Ave, Newark, NJ 07112, USA.
| | - Ann Jacob
- Newark Beth Israel Medical Center, 201 Lyons Ave, Newark, NJ 07112, USA.
| | - Teah Qvavadze
- Newark Beth Israel Medical Center, 201 Lyons Ave, Newark, NJ 07112, USA.
| | - Claudio Guerrieri
- Newark Beth Israel Medical Center, 201 Lyons Ave, Newark, NJ 07112, USA.
| | - Rachel Hudacko
- Newark Beth Israel Medical Center, 201 Lyons Ave, Newark, NJ 07112, USA.
| | - Thaddeus Boucree
- Newark Beth Israel Medical Center, 201 Lyons Ave, Newark, NJ 07112, USA.
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Abstract
INTRODUCTION Pilomatrixoma, also known as calcifying epithelioma of Malherbe, is a superficial benign skin tumor that arises from hair follicle matrix cells. Although pilomatrixomas are well-recognized lesions, clinically they are frequently misdiagnosed as other skin conditions. By reviewing all the literature over the past 10 years, the aims of this article are to analyze the cause, clinical presentation, management, and outcome of pilomatrixoma among children and adults to gain a more complete understanding of this lesion in today's clinical context. METHODS A MEDLINE and EMBASE search was conducted from January 2005 to February 2015 using a combination of the terms: "child," "childhood," "adult," and keywords: "pilomatrixoma," "pilomatricoma," and "calcifying epithelioma of Malherbe." A total of 150 articles were reviewed. RESULTS The lesions occurred most commonly in the first and second decades (mean age 16 years and 7 months). The commonest presentation was of an asymptomatic, firm, slowly growing, mobile nodule. Only 16% were accurately diagnosed on clinical examination. Imaging in the form of ultrasound, computed tomography, and magnetic resonance imaging has been reported. Pathological diagnosis was achieved through incision, punch, and shave biopsies. Pathological findings are discussed and summarized in this review. CONCLUSION Pilomatrixomas are thought to arise from mutation in the Wnt pathway and has been linked to several genetic conditions. It is commonly misdiagnosed preoperatively; however, with better awareness of the lesion, it can be appropriately treated while avoiding unnecessary diagnostic tests. Complete surgical excision with clear margins is almost always curative.
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Jones C, Twoon M, Ho W, Portelli M, Robertson BF, Anderson W. Pilomatrix carcinoma: 12-year experience and review of the literature. J Cutan Pathol 2017; 45:33-38. [DOI: 10.1111/cup.13046] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Revised: 09/03/2017] [Accepted: 09/11/2017] [Indexed: 11/29/2022]
Affiliation(s)
- Christopher Jones
- Plastic and Reconstructive Surgery Department; St John's Hospital; Livingston UK
| | - Mark Twoon
- Plastic and Reconstructive Surgery Department; St John's Hospital; Livingston UK
| | - Weiguang Ho
- Department of Plastic Surgery; Ulster Hospital; Belfast UK
| | - Mark Portelli
- Canniesburn Unit, Plastic and Reconstructive Surgery Department; Glasgow UK
| | | | - William Anderson
- Plastic and Reconstructive Surgery Department; St John's Hospital; Livingston UK
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Distinct expression profile of stem cell markers, LGR5 and LGR6, in basaloid skin tumors. Virchows Arch 2017; 470:301-310. [DOI: 10.1007/s00428-016-2061-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 11/21/2016] [Accepted: 12/20/2016] [Indexed: 01/22/2023]
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Kim YS, Shin DH, Choi JS, Kim KH. The Immunohistochemical Patterns of the beta-Catenin Expression in Pilomatricoma. Ann Dermatol 2010; 22:284-9. [PMID: 20711264 DOI: 10.5021/ad.2010.22.3.284] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Revised: 04/07/2010] [Accepted: 04/13/2010] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND Pilomatricoma is a benign follicular tumor that is composed of basaloid cells, transitional cells and shadow cells. beta-Catenin is a 92-kDa protein, and it plays important roles in cell-cell adhesion at the cell membrane and signal transduction in the nucleus. beta-Catenin has recently been shown to play an important role in the formation of hair follicle-related tumors, including pilomatricoma. However, the pattern and the intracellular localization of the beta-Catenin expression are still controversial. OBJECTIVE We wanted to evaluate the pattern and the intracellular localization of the beta-Catenin expression in pilomatricoma by performing immunohistochemical staining. METHODS Twenty-seven paraffin-embedded tissue samples that were diagnosed as pilomatricoma were immunohistochemically stained with beta-Catenin antibody. RESULTS Basaloid cells were found 15 samples of the total 27 pilomatricomas. All (15/15) of the basaloid cells strongly expressed beta-Catenin, but the transitional cells and the shadow cells did not. In the basaloid cells, the nuclei and membranes showed prominent beta-Catenin immunoreactivities, but the cytoplasm showed weak beta-Catenin immunoreactivity. CONCLUSION This study confirmed that the nucleus and membrane of all the basaloid cells in the pilomatricomas showed a strong beta-Catenin expression, but the transitional cells and shadow cells showed negative beta-Catenin immunoreactivity.
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Affiliation(s)
- Young Sik Kim
- Department of Dermatology, College of Medicine, Yeungnam University, Daegu, Korea
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Gököz O, Presenti L, Gambacorta G, Zolfanelli F, Tricarico R, Nistri R, Baroni G, Bianchi S, Massi D. Skin-type adnexal tumor with trichoblastic germinative differentiation in the breast: a case report. Int J Surg Pathol 2009; 19:527-33. [PMID: 19468034 DOI: 10.1177/1066896909337383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Adnexal tumors with follicular differentiation in the breast parenchyma are rarely encountered. The authors present a unique case arising in a 64-year-old woman, in whom they observed composite differentiation toward follicular germinative cells of the hair follicle with focal areas of outer root sheath differentiation and pilar-type keratinization. The histogenesis of this tumor is analyzed in light of the peculiar pathological, immunohistochemical, and molecular genetic findings.
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Affiliation(s)
- Ozay Gököz
- Department of Pathology, Hacettepe University Faculty of Medicine, Sihhiye, Ankara, Turkey
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Bezdekova M, Brychtova S, Sedlakova E, Steigerova J, Hlobilkova A, Bienova M, Kucerova R, Brychta T, Krejci V, Kolar Z. Immunohistochemical assessment of E-cadherin and beta-catenin in trichofolliculomas and trichoepitheliomas. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2008; 151:251-5. [PMID: 18345259 DOI: 10.5507/bp.2007.042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Trichofolliculomas and trichoepitheliomas are benign skin neoplasms originating from hair follicle cells. They result from defects in the signaling pathways that regulate hair follicle morphogenesis and regeneration. Thus they seem to be an excellent model of these processes. It is known that the E-cadherin/beta-catenin system of adhesion molecules plays a crucial role in the maintenance of tissue architecture. AIM The aim of the present study was to investigate their involvement in benign hair follicle tumor development. METHODS Semiquantitative intensity of expression were examined in formalin-fixed and paraffin-embedded tissue sections of 53 trichoepitheliomas, 15 trichofolliculomas and 19 normal skin samples by indirect immunohistochemistry. RESULTS The intensity of E-cadherin/beta-catenin expression in tumor cells did not differ from controls. However, normal hair follicles cells exhibited membranous E-cadherin/beta-catenin expression, whereas both types of tumors, particularly trichoepitheliomas, showed E-cadherin/beta-catenin expression with a predominantly cytoplasmic localization. CONCLUSIONS We suggest that this dystopic distribution of the E-cadherin/beta-catenin complex in hair follicle tumor cells may be a marker of cell-cell adhesion disruption which may contribute to the tumor formation.
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Affiliation(s)
- Michala Bezdekova
- Department of Pathology, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic.
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