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2. Hormones:

  • Thyroxine - in addition to erythropoietin, thyroxine also forms an important general factor for erythropoiesis. Thyroxine accelerates the process of erythropoiesis at many levels. In hyperthyroidism, polycythemia is common.

  • Hypophyseal erythropoietical hormone, ACTH, STH - enforce erythropoiesis.

  • Suprarenal glands – glucocorticoids, adrenaline - enforce erythropoiesis.

  • Parathyroid - parathormone - enforces erythropoiesis.

  • Female sexual organs – erythropoiesis weakening.

  • Male sexual organs - enforce erythropoiesis.

3. Hemopoietic Growth Factors

Hemopoietic growth factors or growth inducers are the interleukins and stem cell factor (steel factor). Generally these factors induce the proliferation of pluripotent stem cells.

Interleukins (IL) are glycoproteins which belong to the cytokines family. The interleukins involved in erythropoie­sis are.interleukin-3 (IL-3), interleukin-6 (IL-6) and inter-leukin-11 (IL-11). IL-3 is secreted by T lymphocyte. IL-6 is secreted by T lymphocytes, endothelial cells and macrophages. IL-11 is secreted by osteoblasts.

4. Colony Stimulating Factors

The colony stimulating factors (CSF) cause the forma­tion of colony forming blastocytes. There are three types of colony stimulating factors.

1) Granulocyte CSF (G-CSF) secreted by monocytes and endothelial cells.

                  1. 2) Granulocyte-Monocyte CSF (GM-CSF) secreted by monocytes, endothelial cells and T lymphocytes

                  2. 3) Monocyte CSF ( M-CSF) secreted by monocytes and endothelial cells.

5. Vitamins

Some vitamins are also necessary for the process of erythropoiesis. The deficiency of these vitamins cause anemia associated with other disorders. The vitamins, which are necessary for erythropoiesis are:

Vitamin B: Its deficiency causes anemia and pellagra.

Vitamin C: Its deficiency causes anemia and scurvy.

Vitamin D: Its deficiency causes anemia and rickets.

MATURATION FACTORS

Vitamin B12, intrinsic factor and folic acid are necessary for the maturation of red blood cells.

1. Vitamin b12 (Cyanocobalamin)

This is essential for maturation of erythrocytes. The deficiency of vitamin B12 causes pernicious anemia. So, Vitamin B12 is called antipernicious factor.

Source of Vitamin B12

Vitamin B12 is called extrinsic factor because it is obtained mostly from diet. Its absorption from the intestine requires the presence of intrinsic factor of Castle. Vitamin B12 is stored in the liver and muscle (mostly liver). Where necessary, it is transported to the bone marrow to promote maturation of red blood cells. It is also produced in the large intestine by the intestinal flora.

Action of Vitamin B12

Vitamin B12 is essential for synthesis of DNA. Its deficit leads to failure in maturation of the cell and reduction of the cell division. Also, the cells are larger with fragile and, weak cell membrane.