ABSTRACT
Abstract Gynecological sarcomas are uncommon and their location in the vulva and vagina has an incidence of 5% of all malignant neoplasms of the female genital tract. We present the case of a 54-year-old patient with a diagnosis of dermatofibrosarcoma protuberans in the vulva, an infrequent pathology, with less than 60 cases reported worldwide in this anatomical location. Clinically it has a locally aggressive behavior, due to the proliferation of spindle cells with pleomorphism and frequent figures of mitosis that infiltrate the reticular dermis and subcutaneous cellular tissue, giving rise to tumor lesions of variable size and with high rates of local recurrence. The treatment of first choice is surgical excision of the tumor with Mohs micrographic surgery or other surgical techniques for complete evaluation of the circumferential and deep peripheral margin. However, the identification of carcinogenesis mechanis ms where the chromosomal translocation t (17; 22) (q22; q13) is recognized, forming the COL1A1-PDGFB fusion gene, which participates in stimulating tumor cell proliferation, allowing treatment with tyrosine kinase inhibitors such as imatinib for neoadjuvant therapy of surgically unresectable tumors and local recurrences.
Resumen Los sarcomas ginecológicos son infrecuentes y la localización de estos en vulva y vagina tienen una incidencia del 5% de todas las neoplasias malignas del tracto genital femenino. Presentamos el caso de una paciente de 54 años con diagnóstico de dermatofibrosarcoma protuberans en vulva, una patología infrecuente, con menos de 60 casos reportados a nivel mundial en esta localización anatómica. Clínicamente tiene un comportamiento localmente agresivo, debido a la proliferación de células fusiformes con pleomorfismo y frecuentes figuras de mitosis que infiltran la dermis reticular y tejido celular subcutáneo, dando origen a lesiones tumorales de tamaño variable y con altas tasas de recurrencia local. El tratamiento en primera elección es la escisión quirúrgica del tumor con cirugía micrográfica de Mohs u otras técnicas quirúrgicas para evaluación completa del margen periférico circunferencial y profundo. Sin embargo, la identificación de mecanismos de carcinogénesis donde se reconoce la translocación cromosómica t (17; 22) (q22; q13), formando al gen de fusión COL1A1-PDGFB, el cual participa estimulando la proliferación celular tumoral, ha permitido la utilización de los inhibidores de la tirosina quinasa como el imatinib para la realización de terapia neoadyuvante en casos de tumores irresecables quirúrgicamente y en recurrencias locales.
ABSTRACT
Objective To investigate the effect of Jieju Fushenning(JFN) on platelet-derived growth factor B(PDGF-B) and bone morphogenetic protein-7(BMP-7) expression in renal tissue of rats with diabetes mellitus(DM). Methods The diabetic SD rats induced by STZ were divided into four groups:model group,JJFSN group,irbesartan group and JFN combined with irbesartan group. Meanwhile,a normal control group was set up. The rats in each group received corresponding treatment for 12 weeks. The urinary albumin excretion rate(UAER) was detected by routine analysis method,and PDGF-B and BMP-7 expression in renal tissue were detected by immunohistochemical techniques. PDGF-B expression in renal tissue was detected by Western blot,and the ultrastructure of kidney was observed by transmission electron microscope. Results The expression of BMP-7 was decreased and PDGF-B expression was increased in renal cortex of the model group. PDGF-B expression was obviously decreased and BMP-7 expression was increased in JFN group,irbesartan group and JFN combined with irbesartan group compared with those in the model group(P
ABSTRACT
AIM To investigate the effect of Hemin on the production of endogenous CO and the expression of PDGF B gene in rat lung tissue, and discuss the mechanism by which Hemin decreases the right ventricular systolic pressure (RVSP) and ameliorated the vascular remodeling of pulmonary artery in the hypoxic pulmonary hypertension rats. METHODS The rat model of hypoxic pulmonary hypertension were recreated by intermittent normal pressure hypoxia (10% O 2). Right ventricular systolic pressure was measured by right ventricular catheter. The quantity of carbon monoxide hemoglobin (COHb) in rat arterial blood was examined by double wavelength spectrophotometry. Expression of PDGF B and PCNA protein were determined by immunohistochemistry staining. PDGF B mRNA was examined by in situ hybridization. RESULTS ① The in situ hybridization and immunohistochemistry staining in the wall of intra acinar pulmonary arteries (IAPA) of normal rats were negative, but positive in hypoxic rats. The quantity of COHb in the arterial blood of hypoxic rats was higher than that of normal rats( P
ABSTRACT
AIM: To determine whether the high mobility group protein I (HMGI) is able to bind to the upstream sequence of platelet-derived growth factor B-chain gene and to characterize the HMGI-binding AT-rich regions. METHODS: Recombinant human HMGI (rhHMGI) protein was prepared and electrophoresis mobility shift assay (EMSA) was used. RESULTS: The binding of rhHMGI to PDGF-B (-1 758 / +43 bp) was observed in vitro. Two major HMGI-binding fragments -1 392 / -1 180 bp and -188 / +43 bp were identified, which contained the same AT-rich sequence TTTATAAA (-1 333 / -1 326 bp, -1 314 / -1 307 bp and -30 / -23 bp). An oligonucleotide bound to the TTTATAAA and the GAGACC, the core sequence of the shear stress response element of the PDGF-B, could also bind to the HMGI. Furthermore, HMGI facilitated the binding of NF-?B to the GAGACC in the oligonucleotide. CONCLUSION: The HMGI could bind to the upstream sequence of the PDGF-B gene via the AT-rich sequence TTTATAAA, which may play a role in the transcriptional regulation of the PDGF-B gene.