کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9102950 1152367 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mitogenicity of a spread film of monophosphoryl lipid A
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوشیمی بالینی
پیش نمایش صفحه اول مقاله
Mitogenicity of a spread film of monophosphoryl lipid A
چکیده انگلیسی
When spread at the air-water interface, monophosphoryl lipid A (MPLA) forms stable insoluble monolayers that collapse at ∼55 dyn/cm. At collapse, the exclusion area of each molecule is ∼119 Å2, consistent with the cross-sectional area of the lipid's 6 acyl chains. The nominal thickness of such films is ∼22 Å, determined, presumably, by the length of the acyl chains. For biological modeling of MPLA films, a system was developed in which monolayers of the lipid are supported by monodisperse hydrophobic beads of microscopic dimensions. Beads coated with MPLA monolayers within which the nominal area of each molecule is approximately equivalent to the “take-off” area of the lipid at the air-water interface, 280 Å2, are mitogenic for spleen cells. Given the natural occurrence of lipid A in the bacterial cell wall as well as the inherent stability of lipid A films, it seems reasonable to assume that at least some of the biological activities attributed to the lipid derive from its presentation/operation at an interface, i.e., on a surface. We propose beads coated with adsorbed films of lipid A will prove useful tools for modeling the activities of the lipid both in vitro and in vivo, and for elucidating the surface dependency and structural requirements of those activities.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental and Molecular Pathology - Volume 79, Issue 2, October 2005, Pages 161-167
نویسندگان
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