Lutzner cells

Lutzner cells were discovered by Marvin A. Lutzner, Lucien-Marie Pautrier, and Albert Sézary. These cells are described as the smaller forms of Sézary cells, or Sézary-Lutzner cells, and the two variants are recognised as being morphologically different. Aggregates of these cells in mycosis fungoides are known as a Pautrier's microabscesses. They are a form of T-lymphocytes that has been mutated  This atypical form of T-lymphocytes contains T-cell receptors on the surface and is found in both the dermis and epidermis layers of the skin. Since Lutzner cells are a mutated form of T-lymphocytes, they develop in bone marrow and are transported to the thymus is order to mature. The production and maturation stages occur before the cell has developed a mutation. Lutzner cells can form cutaneous T-cell lymphoma, which is a form of skin cancer.

Development of Lutzner cells

Lymphocytes are white blood cells that form from a blood stem cell, hemocytoblast, in bone marrow and travel to other parts of the body, normally specific lymphoid tissues, to mature. After being produced, the stem cell differentiates into lymphoid stem cells. Then, T-lymphocytes further mature and differentiate into lymphoblasts when the hormone thymosin is secreted from the thymus. Finally, specialized immune cells, B cells and T cells, and nonspecialized immune cells, nature killer cells, are created from the lymphoblasts. This process is referred to as Leukopoiesis. Lutzner cells are an atypical form of T-cell lymphocytes and are normally CD4+. Lutzner cells develop because of clonal gene rearrangements in the T-cell receptor or antibody. This rearrangement occurs early in the differentiation process and creates novel T-cell receptors that mimic the structure of normal antibodies but are not able to function properly. This mutated form contains an enfolded nuclear membrane and has a cerebriform shape, resembling the shape and folds of the brain.  Lutzner cells can be best seen through electron microscopy because it is able to show the 3-D structure of the cell.

Distribution
Lutzner cells begin developing in bone marrow then travel to the thymus via the secretion of the hormone thymosin. The secretion allows them to differentiate and mature. Once the mutated cell is developed, it patiently waits in the thymus until an antigen presents itself. When a cutaneous lymphocyte antigen is expressed in the skin, the CD4+ Lutzner cell travels to the epidermis and dermis layers of the skin in order to bind to the antigen.

Antibody mutation
Mature lymphocytes are part of the specific immune system because they recognize previous invaders and assist the body in attacking these invaders. These cells have antibodies present on the surface of the extracellular membrane, which contribute to the destruction of the invader or antigen. An antibody is a large protein created by plasma cells and is also known as an immunoglobulin. It binds to a specific antigen to initiate an immune response. T-cell antibodies bind to antigens such as virus infected cells or tumor cells.

In Lutzner cells, there is a mutation in the T-cell receptor that inhibits antigens like CD8 and CD7, but stimulates the over production of other antigens like CD4. This mutation is a clonal gene rearrangement at the TCR-γ gene. Clonal gene rearrangements create novel or new surface antibodies during early differentiation. Since these mutated antibodies are created early on, they are able to undergo mitosis and produce new T-cell lymphocytes that also contain the novel antigens. The abnormal quantity of T-cell receptors occurs because they are selected for since they express new qualities.  CD4+ is the receptor that is selected for and increases in number in Lutzner cells. The neoplastic T-cells produce cytokines which active the expression of eosinophils and suppress the ability of T-cells to initiate an immune response. Since T-cell activity is lessened, the cells are not able to respond to invaders. Invaders are allowed to grow and produce lesions, and as the lesions increase in size the T-cell antigen is lost. Once this antigen is lost, the T-cell antibodies will never be able to detect the pathogen, allowing the pathogen to increase in size and cause an infection to occur. This leads to the development of non-Hodgkin's lymphoma such as mycosis Fungoides and Sézary disease.

Types
The mutated cells are mature T-lymphocytes and contain CD4+ receptors on the membrane surface. There are two variants of this mutated cell, Lutzner cells and Sézary cells. Sometimes these names are interchangeable, but it has been determined through histology that they are morphologically different.

Lutzner cells
Lutzner cells are bigger than normal lymphocytes and contain extensive folding in their membrane. They are described at being cerebriform in shape, and can be diploid or tetraploid. It also contains a large nucleus with a minimum cytoplasm. Lutzner cells are more predominant in Mycosis Fungoides, but are also found in Sézary Syndrome.

Sézary cells
Sézary cells are bigger than Lutzner cells, and have an overabundance of cellular folds in the membrane. They are also considered over pigmented and have large cerebriform nuclei with a small cytoplasm. Sézary cells are found in both mycosis fungoides and Sézary disease.

Diseases

Lymphoma
It is an unrare form of cancer that originates in the lymph system and causes the destructive effects in the immune system. There are two types of lymphoma, Hodgkin's lymphoma and non-Hodgkin's lymphoma. Both types of lymphomas form from a white blood cell or lymphocyte.  Non-Hodgkin's lymphoma is the more common of the two cancers. The only way to tell these two forms of lymphoma apart is to perform a biopsy in order to get a microscopic view of the cancer cells. Hodgkin's lymphoma involves the abnormal growth of undifferentiated lymphocytes, while non-Hodgkin's lymphoma involves differentiated immune cells like B cells and T cells for example. Lutzner cells are involved with non-Hodgkin's lymphoma.

Non-Hodgkin's lymphoma

It is the most common type and diverse range of lymphoma. Normally, it occurs with a B cell becoming abnormal, but also occurs when a T cell becomes abnormal. The mutated cell then divides to create multiple cells. Lymphoma cells can be distributed all over the body and into various tissues. Lutzner cells are found in skin tissue, more specifically, the epidermis and dermis layers. An accumulation of Lutzner cells in the layers of the skin can cause cutaneous T-cell lymphoma. Cutaneous cell lymphoma is the second most common form of non-Hodgkin's lymphoma.  Two forms of cutaneous T-cell lymphoma associated with abnormal T-lymphocytes or Lutzner cells are Mycosis Fungoides and Sézary Syndrome. These two diseases are very similar, but both present themselves in different ways.

Mycosis fungoides

 Signs and Symptoms:
 4 Phases:
 Premycotic Phase: Scale-like red rash on areas of the skin that are not exposed to the sun.
 Patch Phase: An itchy, thin rash
 Plaque Phase: Raised bumps or lesions present on the skin
 Tumor Phase: Tumors begin to form on the skin near or under the lesions. 
 4 Stages
 Diagnosis:
 Physical exam to check for lesions 
 Peripheral blood smear 
 Use a microscope to count the number of blood cells and look at their shape.
 Skin biopsy
 Checks for signs of cancer
Immunophenotyping
 Flow cytometry
 T-cell receptor gene rearrangement test
 Liver Function Test
 HIV test
 X-ray, CT scan, and PET scan
 To determine if the lymphoma is metastatic  
 Treatments:
 Chemotherapy
 Radiation
 Drug Therapy
 Photodynamic Therapy
 Biologic Therapy using Interferon
 Targeted Therapy 
 UV Radiation Therapy 
 Clinical Trials being pursued
 Stem cell transplant combined with chemoradiation
 Clinical trials being pursued

Sézary disease

 Signs and Symptoms
 Rough, red rash
 Lymphadenopathy
 Abnormal thickening of the palms of the hands and soles of the feet
 Hair loss of balding
 Nail trauma
 Ectropion
 Liver and Spleen become swollen 
 4 Stages (link)
 Diagnosis
 Physical exam to check for lesions 
 Peripheral blood smear 
 Use a microscope to count the number of blood cells and look at their shape.
 Skin biopsy
 Checks for signs of cancer
 Immunophenotyping
 Flow cytometry
 T-cell receptor gene rearrangement test
 Liver Function test
 HIV test
 X-ray, CT scan, and PET scan
 To determine if the lymphoma is metastatic  
 Treatments 
 Chemotherapy
 Radiation
 Drug Therapy
 Photodynamic Therapy
 Biologic Therapy using Interferon
 Targeted Therapy 
 UV Radiation Therapy 
 Clinical Trials being pursued
 Stem cell transplant combined with chemoradiation
 Clinical trials being pursued

See also
 Tumors
 Skin Cancer

References

Lymphocytes