RESUMO
Human artificial chromosomes (HACs) have been developed as genetic vectors with the capacity to carry large transgenic constructs or entire gene loci. HACs represent either truncated native chromosomes or de novo synthesized genetic constructs. The important features of HACs are their ultra-high capacity and ability to self-maintain as independent genetic elements, without integrating into host chromosomes. In this review, we discuss the development and construction methods, structural and functional features, as well as the areas of application of the main HAC types. Also, we address one of the most technically challenging and time-consuming steps in this technology - the transfer of HACs from donor to recipient cells.
RESUMO
Previously we've described the obtainment of a subpopulation of cancer stem cells from a human colorec- tal carcinoma cell line MIP101. These cells possess elevated clonogenic and tumorigenic capacities. According to our data, depletion of stem compartment in a cancer cell population blocks its tumorigenicity. The current work is dedicated to the comparison of tumorigenic potential between cell populations with enriched or depleted stem compartment. We show that tumor growth following xenografting of enriched stem cell population can be suppressed by intramuscular injections of ganciclovir. Thus, we report a method to obtain a cell population with high Oct4 promoter expression within the MIP101 colorectal carcinoma cell line and to eliminate these cells from the population in vitro as well as in vivo.
Assuntos
Biomarcadores Tumorais/biossíntese , Neoplasias Colorretais/patologia , Neoplasias Colorretais/prevenção & controle , Células-Tronco Neoplásicas/citologia , Células-Tronco Neoplásicas/efeitos dos fármacos , Fator 3 de Transcrição de Octâmero/biossíntese , Animais , Biomarcadores Tumorais/genética , Técnicas de Cultura de Células , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Neoplasias Colorretais/metabolismo , Ganciclovir/farmacologia , Ganciclovir/uso terapêutico , Vetores Genéticos , Humanos , Lentivirus/genética , Camundongos , Camundongos Nus , Células-Tronco Neoplásicas/metabolismo , Células-Tronco Neoplásicas/patologia , Fator 3 de Transcrição de Octâmero/genética , Puromicina/farmacologia , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
In the current work we make an attempt to compare cancer cells of one origin, but differing in the expression of CEA protein, a clinical marker of metastatic carcinomas, presumably one of the key factors in metastatic activity. We have explored the morphology of cell colonies in vitro, expression patterns of epithelial markers, the ability of these cells to form tumors and metastases in vivo, and evaluated their stem compartment with the aid of a suicidal genetic construct sensitive to the embryonic stem cell marker, Oct4.
