RESUMEN
Hospitals and federal officials are scrambling to manage a newly discovered infection risk in open chest surgeries. What patients need to know to protect themselves.
Asunto(s)
Procedimientos Quirúrgicos Cardíacos/instrumentación , Infección Hospitalaria/etiología , Contaminación de Equipos , Mycobacterium , Contaminación del Aire Interior/efectos adversos , Procedimientos Quirúrgicos Cardíacos/efectos adversos , Infección Hospitalaria/mortalidad , Seguridad de Equipos , Humanos , QuirófanosAsunto(s)
Terapia por Acupuntura , Manejo del Dolor/métodos , China , Humanos , Resultado del TratamientoRESUMEN
Follicular helper T cells (Tfh cells) are the major producers of interleukin-4 (IL-4) in secondary lymphoid organs where humoral immune responses develop. Il4 regulation in Tfh cells appears distinct from the classical T helper 2 (Th2) cell pathway, but the underlying molecular mechanisms remain largely unknown. We found that hypersensitivity site V (HS V; also known as CNS2), a 3' enhancer in the Il4 locus, is essential for IL-4 production by Tfh cells. Mice lacking HS V display marked defects in type 2 humoral immune responses, as evidenced by abrogated IgE and sharply reduced IgG1 production in vivo. In contrast, effector Th2 cells that are involved in tissue responses were far less dependent on HS V. HS V facilitated removal of repressive chromatin marks during Th2 and Tfh cell differentiation and increased accessibility of the Il4 promoter. Thus, Tfh and Th2 cells utilize distinct but overlapping molecular mechanisms to regulate Il4, a finding with important implications for understanding the molecular basis of allergic diseases.
