Hair follicle development is initiated by reciprocal molecular interactions between the placode-forming epithelium and the underlying mesenchyme. Cell fate transformation in dermal fibroblasts generates a cell niche for placode induction by activation of signaling pathways WNT, EDA, and FGF in the epithelium. These successive paracrine epithelial signals initiate dermal condensation in the underlying mesenchyme. Although epithelial signaling from the placode to mesenchyme is better described, little is known about primary mesenchymal signals resulting in placode induction. Using genetic approach in mice, we show that Meis2 expression in cells derived from the neural crest is critical for whisker formation and also for branching of trigeminal nerves. While whisker formation is independent of the trigeminal sensory innervation, MEIS2 in mesenchymal dermal cells orchestrates the initial steps of epithelial placode formation and subsequent dermal condensation. MEIS2 regulates the expression of transcription factor Foxd1, which is typical of pre-dermal condensation. However, deletion of Foxd1 does not affect whisker development. Overall, our data suggest an early role of mesenchymal MEIS2 during whisker formation and provide evidence that whiskers can normally develop in the absence of sensory innervation or Foxd1 expression.

• MeSH
• crista neuralis MeSH
• forkhead transkripční faktory metabolismus   genetika   MeSH
• homeodoménové proteiny * metabolismus   genetika   MeSH
• mezoderm * metabolismus   MeSH
• myši MeSH
• nervus trigeminus * MeSH
• vibrissae * inervace   růst a vývoj   embryologie   MeSH
• vývojová regulace genové exprese MeSH
• zvířata MeSH
• Check Tag
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

Fibroblasts, the most abundant cell type in the human body, play crucial roles in biological processes such as inflammation and cancer progression. They originate from the mesoderm or neural-crest-derived ectomesenchyme. Ectomesenchyme-derived fibroblasts contribute to facial formation and do not express HOX genes during development. The expression and role of the HOX genes in adult fibroblasts is not known. We investigated whether the developmental pattern persists into adulthood and under pathological conditions, such as cancer. We collected adult fibroblasts of ectomesenchymal and mesodermal origins from distinct body parts. The isolated fibroblasts were characterised by immunocytochemistry, and their transcriptome was analysed by whole genome profiling. Significant differences were observed between normal fibroblasts from the face (ectomesenchyme) and upper limb (mesoderm), particularly in genes associated with limb development, including HOX genes, e.g., HOXA9 and HOXD9. Notably, the pattern of HOX gene expression remained consistent postnatally, even in fibroblasts from pathological tissues, including inflammatory states and cancer-associated fibroblasts from primary and metastatic tumours. Therefore, the distinctive HOX gene expression pattern can serve as an indicator of the topological origin of fibroblasts. The influence of cell position and HOX gene expression in fibroblasts on disease progression warrants further investigation.

• MeSH
• dospělí MeSH
• fibroblasty * metabolismus   cytologie   MeSH
• homeoboxové geny MeSH
• homeodoménové proteiny metabolismus   genetika   MeSH
• kultivované buňky MeSH
• lidé MeSH
• mezoderm * metabolismus   cytologie   MeSH
• Check Tag
• dospělí MeSH
• lidé MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH

Branchioma is an uncommon benign neoplasm with an adult male predominance, typically occurring in the lower neck region. Different names have been used for this entity in the past (ectopic hamartomatous thymoma, branchial anlage mixed tumor, thymic anlage tumor, biphenotypic branchioma), but currently, the term branchioma has been widely accepted. Branchioma is composed of endodermal and mesodermal lineage derivatives, in particular epithelial islands, spindle cells, and mature adipose tissue without preexistent thymic tissue or evidence of thymic differentiation. Twenty-three branchiomas were evaluated morphologically. Eighteen cases with sufficient tissue were assessed by immunohistochemistry, next-generation sequencing (NGS) using the Illumina Oncology TS500 panel, and fluorescence in situ hybridization (FISH) using an RB1 dual-color probe. All cases showed a biphasic morphology of epithelial and spindle cells with intermingled fatty tissue. Carcinoma arising in branchioma was detected in three cases. The neoplastic cells showed strong AE1/3 immunolabeling (100%), while the spindle cells expressed CD34, p63, and SMA (100%); AR was detected in 40-100% of nuclei (mean, 47%) in 14 cases. Rb1 showed nuclear loss in ≥ 95% of neoplastic cells in 16 cases (89%), while two cases revealed retained expression in 10-20% of tumor cell nuclei. NGS revealed a variable spectrum of likely pathogenic variants (n = 5) or variants of unknown clinical significance (n = 6). Loss of Rb1 was detected by FISH in two cases. Recent developments support branchioma as a true neoplasm, most likely derived from the rudimental embryological structures of endoderm and mesoderm. Frequent Rb1 loss by immunohistochemistry and heterozygous deletion by FISH is a real pitfall and potential confusion with other Rb1-deficient head and neck neoplasms (i.e., spindle cell lipoma), especially in small biopsy specimens.

• MeSH
• branchiom * patologie   MeSH
• dospělí MeSH
• hybridizace in situ fluorescenční MeSH
• lidé MeSH
• molekulární biologie MeSH
• nádory brzlíku * MeSH
• nádory glandulární a epitelové * MeSH
• nádory měkkých tkání * patologie   MeSH
• nádory sítnice * MeSH
• retinoblastom * genetika   patologie   MeSH
• thymom * MeSH
• Check Tag
• dospělí MeSH
• lidé MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH

Human mesenchymal stem cells (hMSCs) are mesoderm-derived adult stem cells with self-proliferation capacity, pluripotent differentiation potency, and excellent histocompatibility. These advantages make hMSCs a promising tool in clinical application. However, the majority of clinical trials using hMSC therapy for diverse human diseases do not achieve expectations, despite the prospective pre-clinical outcomes in animal models. This is partly attributable to the intrinsic heterogeneity of hMSCs. In this review, the cause of heterogeneity in hMSCs is systematically discussed at multiple levels, including isolation methods, cultural conditions, donor-to-donor variation, tissue sources, intra-tissue subpopulations, etc. Additionally, the effect of hMSCs heterogeneity on the contrary role in tumor progression and immunomodulation is also discussed. The attempts to understand the cellular heterogeneity of hMSCs and its consequences are important in supporting and improving therapeutic strategies for hMSCs.

• MeSH
• buněčná diferenciace fyziologie   MeSH
• lidé MeSH
• mezenchymální kmenové buňky * MeSH
• transplantace mezenchymálních kmenových buněk * metody   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• přehledy MeSH

Vysokoškolská učebnice, která se zaměřuje na embryologii.; Překlad již 14. vydání mimořádně úspěšné publikace, která si získala oblibu u nás i ve světě. Knihu ocení lékaři většiny odborností, přírodovědci a studenti řady fakult (lékařských, zdravotnických, přírodovědeckých…).

• MeSH
• embryologie MeSH
• klinické lékařství MeSH

• Konspekt
• Pediatrie
• NLK Obory
• embryologie a teratologie
• NLK Publikační typ
• učebnice vysokých škol

The oocyte is a unique cell, from which develops a complex organism comprising of germ layers, tissues and organs. In some vertebrate species it is known that the asymmetrical localization of biomolecules within the oocyte is what drives the spatial differentiation of the daughter cells required for embryogenesis. This asymmetry is first established to produce an animal-vegetal (A-V) axis which reflects the future specification of the ectoderm, mesoderm, and endoderm layers. Several pathways for localization of vegetal maternal transcripts have already been described using a few animal models. However, there is limited information about transcripts that are localized to the animal pole, even though there is accumulating evidence indicating its active establishment. Here, we performed comparative TOMO-Seq analysis on two holoblastic cleavage models: Xenopus laevis and Acipenser ruthenus oocytes during oogenesis. We found that there were many transcripts that have a temporal preference for the establishment of localization. In both models, we observed vegetal transcript gradients that were established during either the early or late oogenesis stages and transcripts that started their localization during the early stages but became more pronounced during the later stages. We found that some animal gradients were already established during the early stages, however the majority were formed during the later stages of oogenesis. Some of these temporally localized transcripts were conserved between the models, while others were species specific. Additionally, temporal de novo transcription and also degradation of transcripts within the oocyte were observed, pointing to an active remodeling of the maternal RNA pool.

• Publikační typ
• časopisecké články MeSH

Dermoid cyst of the parotid gland is a lesion composed of benign tissues of ectodermal and mesodermal origin. Although a dermoid cyst can be encountered across nearly all sites of the body, its location in the head and neck area is quite uncommon and even more unusual inside the parotid gland. We present a case of a patient with gradually enlarging tumour in her right parotid gland who underwent surgical removal of the tumour histologically corresponding to a dermoid cyst.

• MeSH
• dermoidní cysta * diagnóza   patologie   chirurgie   MeSH
• lidé MeSH
• nádory příušní žlázy * diagnóza   patologie   chirurgie   MeSH
• parotis chirurgie   MeSH
• Check Tag
• lidé MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• kazuistiky MeSH

BACKGROUND: In Turner syndrome (TS), fluorescent in situ hybridization (FISH) karyotyping offers an alternative to classical karyotyping. OBJECTIVE: We tested the added value of FISH karyotyping from lymphocytes (mesodermal origin), buccal cells (ectodermal origin), and a rear-tongue smear (endodermal origin) to determine the 45,X cell line fraction and its impact on patient phenotype. DESIGN AND PATIENTS: Classical karyotyping and three FISH assays were done in 153 girls and women previously diagnosed with TS in four university hospitals. The 45,X cell line fraction was determined for each method and correlated with the major phenotypic signs. RESULTS: Classical karyotyping identified 45,X/46,XX mosaicism in 77/153 subjects (50%), 45,X monosomy in 52/153 (34%), and other karyotypes in 24/153 (16%). FISH from lymphocytes verified 45,X in 47/52 original cases, whereas 4/52 had 45,X/46,XX and 1/52 45,X/47,XYY mosaicism. The 45,X cell line fraction was higher in FISH from lymphocytes compared to classical karyotyping (median 86.4% vs. 70.0%; p < 0.001), while there was no difference for FISH from buccal or rear-tongue smear cells. The mean 45,X cell line fraction was more abundant in patients with several of the characteristic phenotypic signs compared to patients without them (p < 0.01), but the predictive power was insufficient. CONCLUSION: FISH analysis confirmed the findings of classical karyotyping; only a few 45,X monosomy cases were reclassified as mosaics. The 45,X cell line fraction did not show clinically meaningful prediction of the phenotype. FISH analysis of buccal or rear-tongue epithelial cells may be a non-inferior, less invasive alternative to classical karyotyping.

• MeSH
• epitelové buňky MeSH
• hybridizace in situ fluorescenční MeSH
• karyotypizace MeSH
• lidé MeSH
• lymfocyty metabolismus   MeSH
• monozomie MeSH
• mozaicismus MeSH
• Turnerův syndrom * metabolismus   MeSH
• ústní sliznice MeSH
• Check Tag
• lidé MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH

Vysokoškolská učebnice, která se zaměřuje na anatomii trávicího a dýchacího systému člověka.; Vysokoškolská učebnice předkládá systematickou anatomii trávicího a dýchacího systému.

• MeSH
• anatomie MeSH
• dýchací soustava MeSH
• trávicí systém MeSH

• Konspekt
• Anatomie člověka a srovnávací anatomie
• Učební osnovy. Vyučovací předměty. Učebnice
• NLK Obory
• anatomie
• NLK Publikační typ
• učebnice vysokých škol

Fibroepiteliální polypy jsou benigní nádory vycházející z pojivové tkáně. Jsou mezodermálního původu, kryté obvykle dlaždicovým epitelem, nejčastěji se nacházejí na kůži, v urogenitálním traktu nebo v oblasti dolních cest dýchacích. Mohou být ojedinělé nebo vícečetné. Jejich rozměry obvykle nepřesahují 1-2 milimetry. Zcela výjimečně mohou dosahovat obrovských rozměrů. V literatuře byl popsán obří fibroepiteliální polyp o velikosti 42 centimetrů. Přestože etiologie a faktory způsobující nadměrný růst nebyly objasněny, uvádí se, že růst může vyvolat především chronické mechanické dráždění, obezita a inzulinová rezistence, lymfatická stagnace a chronický zánět. Možnosti odstranění těchto projevů jsou chirurgické snesení, laserové ablace, elektrokauterizace, kryodestrukce a další. Existují i možnosti domácího ošetření. Vždy je však nutná pečlivá diagnostika.

Fibroepithelial polyps are benign tumors arising from connective tissue. They are of mesodermal origin and are usually covered with squamous epithelium and come from the skin, genitourinary tract or lower respiratory tract. On the skin, they occur mainly in the skin folds. They can be isolated or multiple. They are usually no larger than 1-2 millimeters. In rare cases, they can reach enormous dimensions. A giant fibroepithelial polyp 42 centimeters in size has been described in the literature. Although the etiology and factors causing overgrowth are not known, an association with chronic mechanical irritation, obesity, insulin resistance, as well as prolonged lymphatic stagnation and chronic inflammation has been reported. Types of removal of these symptoms are surgical excision, laser ablation, electrocauter destruction, cryodestruction and more. There are also home treatment options. However, careful diagnosis is always necessary.

• MeSH
• Birtův-Hoggův-Dubeův syndrom terapie   MeSH
• dermatochirurgické výkony MeSH
• elektrokoagulace MeSH
• fibroepitelové nádory * diagnóza   terapie   MeSH
• fibrom terapie   MeSH
• hamartom terapie   MeSH
• kryoterapie metody   MeSH
• laserová terapie MeSH
• lidé MeSH
• mezoderm patologie   MeSH
• polypy * terapie   MeSH
• syndrom mnohočetného hamartomu terapie   MeSH
• Check Tag
• lidé MeSH