Expression and regulation of keratin 6B in CD44+ bladder cancer stem cells / 中国组织工程研究

BACKGROUND: Bladder cancer stem cells could promote the recurrence and drug resistance of bladder cancer. Numerous studies have shown that keratin 6B (KRT6B) is involved in the production and progression of tumors, and is closely related to the prognosis of tumors. OBJECTIVE: To observe the expression of keratin 6B in CD44+ bladder cancer stem cells and to show the influence of keratin 6B on proliferation, migration, and self-renewal of bladder cancer stem cells, and to further explore the effect of keratin 6B expression on the prognosis of bladder cancer patients. METHODS: (1) CD44+ 5637 bladder cancer stem cells were isolated by magnetic active cell sorting. Cancer stem cell-related gene expression of SOX2, OCT4, and NANOG was detected via real-time polymerase chain reaction. The spheroid formation assay was used to detect the ability of self-renewal of cancer stem cells in CD44+ cells. Keratin 6B expression was detected in CD44+ bladder cancer stem cells by real-time polymerase chain reaction. (2) The CD44+5637 bladder cancer stem cells were divided into two groups. In the keratin 6B siRNA group, keratin 6B small interfering RNA was transfected into CD44+ bladder cancer stem cells. Untransfected CD44+ bladder cancer stem cells were used as the black control group. Cells were collected at 2 days post-transfection. The proliferation, migration, and self-renewal capacity of keratin 6B siRNA CD44+ bladder cancer stem cells were detected by the colony and wound healing assay and spheroid formation respectively. (3) Totally 24 bladder cancer tissues were used by immunohistochemistry to analyze the expression of CD44v6 and keratin 6B. (4) ONCOMINE database was used to analyze the effect of keratin 6B expression on the overall survival of bladder cancer. RESULTS AND CONCLUSION: (1) Cancer stem cell-related genes (SOX2, OCT4, NANOG) and keratin 6B expression was higher in CD44+ cells isolated by magnetic active cell sorting compared with CD44- cells (P < 0.05). Cell proliferation, migration, and in vitro spheroid formation were significantly increased (P < 0.05). Keratin 6B small interfering RNA down-regulated the expression of keratin 6B in CD44+ bladder cancer stem cells (P < 0.05). (2) Compared with the blank control group, the proliferation and migration of CD44+ bladder cancer stem cells after transfection of keratin 6B small interfering RNA (P < 0.05), and the number of tumorsphere significantly diminished (P < 0.05); the expression of Notch1 and Hes1 mRNA increased (P < 0.05). (3) Keratin 6B and CD44v6 were significantly different in bladder cancer tissue (P=0.006). The overall survival rate of bladder cancer patients with high expression of keratin 6B was lower than that of patients with low expression of keratin 6B. (4) The results showed that keratin 6B was highly expressed in CD44+ bladder cancer stem cells, and could promote the proliferation, migration, and self-renewal capacity of bladder cancer stem cells. The high expression of keratin 6B contributes to improving the survival of bladder cancer patients.

Pachyonychia congenita complicated by epidermolysis bullosa simplex Ogna: a pedigree analysis / 中华皮肤科杂志

A 23-year-old male patient presented with repeated painful erosion on the soles of both feet for 10 years, and with walking difficulties for half a month. Skin examination showed thick dark-brown finger and toe nails with distal protuberance, and hard keratinous materials under the nails. Obvious hyperkeratosis and maceration occurred on the soles of both feet, which appeared milky-white in color; diffuse papulovesicles were observed on the soles and lateral margins of both feet with scattered erosions. Vesicles were observed on the wrist and forehead. Follicular papules and fine scales were scattered on the extensor aspect of the forearm and elbow, and diffuse white patches were observed on the surface of the tongue. The above clinical manifestations were consistent with pachyonychia congenita. Peripheral blood samples were obtained from the patient, his parents and grandmother, and subjected to whole-exome sequencing. Sequencing showed two mutations in both the patient and his father, including base deletions at position 516-518 (c.516-518 del CAA) in exon 1 of the KRT6A gene, which caused pachyonychia congenita-K6a, and a base substitution at position 3 970 (c.3970 C>T) in exon 27 of the PLEC gene, which may cause epidermolysis bullosa simplex Ogna. The same mutation in the PLEC gene was found in the patient′s grandmother. The patient was diagnosed with pachyonychia congenita complicated by suspected epidermolysis bullosa simplex Ogna. After 9-month treatment with acitretin, the nails became lighter in color, plantar skin lesions were obviously relieved, and scattered millet-like vesicles in the wrist completely subsided. The patient was followed up at present.

Pachyonychia congenita complicated by epidermolysis bullosa simplex Ogna:a pedigree analysis / 中华皮肤科杂志

A 23-year-old male patient presented with repeated painful erosion on the soles of both feet for 10 years, and with walking difficulties for half a month. Skin examination showed thick dark-brown finger and toe nails with distal protuberance, and hard keratinous materials under the nails. Obvious hyperkeratosis and maceration occurred on the soles of both feet, which appeared milky-white in color;diffuse papulovesicles were observed on the soles and lateral margins of both feet with scattered erosions. Vesicles were observed on the wrist and forehead. Follicular papules and fine scales were scattered on the extensor aspect of the forearm and elbow, and diffuse white patches were observed on the surface of the tongue. The above clinical manifestations were consistent with pachyonychia congenita. Peripheral blood samples were obtained from the patient, his parents and grandmother, and subjected to whole-exome sequencing. Sequencing showed two mutations in both the patient and his father, including base deletions at position 516- 518 (c.516-518 del CAA) in exon 1 of the KRT6A gene, which caused pachyonychia congenita-K6a, and a base substitution at position 3970(c.3970 C>T)in exon 27 of the PLEC gene, which may cause epidermolysis bullosa simplex Ogna. The same mutation in the PLEC gene was found in the patient' s grandmother. The patient was diagnosed with pachyonychia congenita complicated by suspected epidermolysis bullosa simplex Ogna. After 9-month treatment with acitretin, the nails became lighter in color, plantar skin lesions were obviously relieved, and scattered millet-like vesicles in the wrist completely subsided. The patient was followed up at present.

A novel H1 mutation in keratin 6a in an infant with pachyonychia congenita.

Pachyonychia congenita (PC) is a rare genetic disorder which is inherited in an autosomal dominant pattern. We report a sporadic novel H1 mutation in the KRT6A gene (c. 428G>A/p. Ser143Asn) in a Chinese infant patient. The mutation is concurrent with a single-nucleotide polymorphism and resulted in a serine for asparagine substitution in H1 subdomain of KRT6A chain next to the rod domain. The infant showed the classic symptoms of pachyonychia congenita. Conclusion: The heterozygous missense mutation c. 428G > A/p.Ser143Asn in KRT6A exon 1 may cause severe disease

Comparison of nuclear grade and immunohistochemical features in situ and invasive components of ductal carcinoma of breast / Comparação do grau nuclear e perfil imunoistoquímico nos componentes in situ e invasivo de carcinoma mamário

PURPOSE:To compare the prognostic and predictive features between in situ and invasive components of ductal breast carcinomas. METHODS:We selected 146 consecutive breast samples with ductal carcinoma in situ (DCIS) associated with adjacent invasive breast carcinoma (IBC). We evaluated nuclear grade and immunohistochemical expression of estrogen receptor (ER), progesterone receptor (PR), human epidermal growth factor receptor 2 (HER2), cytokeratin 5/6 (CK5/6), and epidermal growth factor receptor (EGFR) in both components, in situ and invasive, and the Ki-67 percentage of cells in the invasive part. The DCIS and IBC were classified in molecular surrogate types determined by the immunohistochemical profile as luminal (RE/PR-positive/ HER2-negative), triple-positive (RE/RP/HER2-positive), HER2-enriched (ER/PR-negative/HER2-positive), and triple-negative (RE/RP/HER2-negative). Discrimination between luminal A and luminal B was not performed due to statistical purposes. Correlations between the categories in the two groups were made using the Spearman correlation method. RESULTS:There was a significant correlation between nuclear grade (p<0.0001), expression of RE/RP (p<0.0001), overexpression of HER2 (p<0.0001), expression of EGFR (p<0.0001), and molecular profile (p<0.0001) between components in situ and IBC. CK 5/6 showed different distribution in DCIS and IBC, presenting a significant association with the triple-negative phenotype in IBC, but a negative association among DCIS. CONCLUSIONS: Our results suggest that classical prognostic and predictive features of IBC are already determined in the preinvasive stage of the disease. However the role of CK5/6 in invasive carcinoma may be different from the precursor lesions.

OBJETIVO: Comparar características prognósticas e preditivas entre os componentes in situ e invasivo de carcinomas ductais da mama. MÉTODOS: Selecionamos 146 amostras mamárias consecutivas com carcinoma ductal in situ (CDIS) associado com carcinoma invasivo (CI) adjacente. Avaliamos grau nuclear e a expressão imunoistoquímica de receptor de estrogênio (RE), receptor de progesterona (RP), receptor do fator de crescimento epidérmico humano 2 (HER2), citoqueratina 5/6 (CK5/6) e o receptor do fator de crescimento epidérmico (EGFR) em ambos componentes, in situ e invasor, e a porcentagem de células marcadas pelo Ki-67 no componente invasivo. CDIS e CI foram classificados nos tipos moleculares, determinados pelo perfil imunoistoquímico, como luminal (RE/RP-positivo/HER2-negativo), triplo-positivo (RE/RP/HER2-positivo), HER2-puro (RE/RP-negativo/HER2-positivo) e triplo-negativo (RE/RP/HER2-negativo). A discriminação entre luminal A e Luminal B não foi feita por motivos estatísticos. Correlações entre as categorias dos dois grupos foram feitas pelo método de correlação de Spearman. RESULTADOS: Houve significante associação entre grau nuclear (p<0,0001), expressão de RE/RP) (p<0,0001), superexpressão de HER2 (p<0,0001), expressão de EGFR (p<0,0001) e perfil molecular (p<0,0001) entre os componentes in situ e invasivo. CK5/6 mostrou distribuição distinta em CDIS e CI, apresentando significante associação com o fenótipo triplo-negativo em CI, mas uma associação negativa ente os CDIS. CONCLUSÕES:Nossos resultados sugerem que as características prognósticas e preditivas clássicas dos CI estão já determinadas no estágio pré-invasivo da doença. Entretanto, o papel da CK5/6 no carcinoma invasivo pode ser diferente daquele das lesões precursoras.