IMMUNOGENETICS OF HYBRID RESISTANCE

长期的目标是确定基因表达的遗传机制， 白血病细胞表面的造血组织相容性（Hh）抗原， 正常祖细胞和表征Hh分子本身。 到 最后，描述了以下目的：1.确认以下结论： 淋巴瘤细胞上的Hh抗原表达被“下调”， 反式作用调控基因。 使用体内和体外测定， 可以测量“冷靶细胞竞争”的杂交抗性， 我们观察到，缺失Dd的ACCb H-2d/H-2b缺失突变体获得了 HHB的表达。 2.更精确地绘制Hh基因图谱。 B10.RQDB是一个新的 由Chella大卫描述的H-2重组体，其表达Dd、Db，但不表达 LD. 因此，D和L之间发生的重组和Db确实是 Lb. 骨髓细胞丢失了Hhb，保留了同种异体宿主的Hhd， 降低了F1代杂种寄主的Hhd。 There和其他新的重组体 将被用来映射Hh，它应该是控制L，因为序列 在D区域中是D（R）L。 (3)检验顺式基因假说，即 相邻基因调控Hh表达。 使用相同的新H-2重组， 检测S和L之间可能调节Hh表达的基因， 调节对亲本Hh抗原的“耐受性”的杂合子。 （四） 继续检验杂交瘤的“同种异体抑制”假说 阻力 来自C.B-17 scid/scid供体的骨髓细胞， 产生同种异体反应性T或B细胞，然而被辐射排斥 同种异体或F1杂交受体小鼠。 (5)表征Hh分子。 35 S-甲硫氨酸标记的EL-4和各种ACCb细胞的裂解物的二维凝胶 线，然后通过计算机分析射线照片，确定了一个90 kd 分子作为Hhb抗原的潜在候选物。 我们将产生 抗体来分离分子，并研究其结构。

The long-term goal is to determine the genetic mechanism of expression of Hemopoietic histocompatibility (Hh) antigens on the surface of leukemic and normal progenitor cells and characterize the Hh molecules themselves. To that end the following Aims are described: 1. Confirm the conclusion that Hh antigenic expression on lymphoma cells is "down-regulated" by trans-acting regulatory genes. Using both in vivo and in vitro assays for hybrid resistance in which "cold target cells competition" can be measured, we observed that ACCb H-2d/H-2b loss mutants which had lost Dd gained the expression of Hhb. 2. Map the Hh genes more precisely. B10.RQDB is a new H-2 recombinant described by Chella David, which expresses Dd, Db, but not Ld. Therefore, recombination occurred between D and L and Db is really Lb. The marrow cells have lost Hhb, retained Hhd for allogenic hosts and have decreased Hhd for F1 hybrid hosts. There and other new recombinants will be used to map Hh, which should be contromeric to L since the sequence is D (R) L in the D-region. (3) Test the cis gene hypothesis, i.e. an adjacent gene regulates Hh expression. Use same new H-2 recombination to detect gene(s) between S and L which may regulate Hh expression in heterozygotes that regulated "tolerance" to parental Hh antigen. (4) Continue to test the "allogenic inhibition" hypothesis for hybrid resistance. Marrow cells from C.B-17 scid/scid donors, which cannot generate alloreactive T or B cells, nevertheless are rejected by irradiated allogeneic or F1 hybrid recipient mice. (5) Characterize Hh molecules. 2-D gels of lysates of 35S-methionine labeled EL-4 and various ACCb cell lines, followed by computer analysis of radiographs, identified a 90 kd molecule as a potential candidate for the Hhb antigen. We will generate antibodies to isolate the molecules, and study its structure.