Immunotherapy remains more effective for hematologic tumors than for solid *** of the main challenges to immunotherapy of solid tumors is the immunosuppressive microenvironment these tumors generate,which limits the c...
详细信息
Immunotherapy remains more effective for hematologic tumors than for solid *** of the main challenges to immunotherapy of solid tumors is the immunosuppressive microenvironment these tumors generate,which limits the cytotoxic capabilities of immune effector cells(e.g.,cytotoxic T and natural killer cells).This microenvironment is characterized by hypoxia,nutrient starvation,accumulated waste products,and acidic ***-hijacked cells,such as fibroblasts,macrophages,and T regulatory cells,also contribute to this inhospitable microenvironment for immune cells by secreting immunosuppressive cytokines that suppress the antitumor immune response and lead to immune ***,there is a strong interest in developing n.w drugs and cell formulations that modulate the tumor microenvironment and reduce tumor cell immune *** systems(MPSs)are versatile tools that may accelerate the development and evaluation of these therapies,although specific examples showcasing the potential of MPSs remain *** in microtechnologies have led to the development of sophisticated microfluidic devices used to recapitulate tumor *** resulting models,also kn.wn as microphysiological systems(MPSs),are versatile tools with which to decipher the molecular mechanisms driving immune cell antitumor cytotoxicity,immune cell exhaustion,and immune cell exclusion and to evaluate n.w targeted ***,we review existing microphysiological platforms to study immuno-oncological applications and discuss challenges and opportunities in the field.
Purpose: To report vitreous oxygen tension before, immediately after, and at longer times after vitrectomy. Design: A prospective, interventional consecutive case series. Methods: Oxygen.was measured using an optical ...
详细信息
Purpose: To report vitreous oxygen tension before, immediately after, and at longer times after vitrectomy. Design: A prospective, interventional consecutive case series. Methods: Oxygen.was measured using an optical oxygen sensor in patients undergoing vitrectomy. Intraoperatively, oxygen measurements were taken before and after vitrectomy in two intraocular locations: adjacent to the lens and in the mid- vitreous. Results: Sixty- nine eyes underwent oxygen tension measurements at the time of vitrectomy. In baseline eyes, oxygen tension in the vitreous was low, measuring 8.7± 0.6 mm Hg adjacent to the lens and 7.1± 0.5 mm Hg in the mid- vitreous. The difference between the two locations was statistically significant (Pndicating that vitreous gel maintains an intraocular oxygen gradient. Immediately after vitrectomy, oxygen tension in the fluid- filled eye was higher, measuring 69.6± 4.8 mm Hg adjacent to the lens and 75.6± 4.1 mm Hg in the mid- vitreous. There was no statistically significant oxygen gradient between the two locations. The difference in oxygen tension pre- and postvitrectomy is highly statistically signifi- cant (P ns, P n eyes with a history of vitrectomy and previous removal of the vitreous gel, the intraocular oxygen tension.was significantly higher than in eyes with a formed vitreous gel undergoing a first vitrectomy (Pns, Pnclusion: Vitrectomy surgery significantly increases intraocular oxygen tension during and for prolonged periods after surgery. This exposes the crystalline lens to abnormally high oxygen and may lead to nuclear cataract formation.
暂无评论