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with&#160; corticosteroids&#160; and oral cyclophosphamide&#46; No renal function&#160; improvement&#160; occurred&#44;&#160; and&#160; renal replacement therapy was required until the patient died in 2003&#46; <br></br><br></br>CASE 2 <br></br>A 72-year-old male&#44; a farmer living in a rural&#160; environment&#46;&#160; In&#160; April&#160; 2004&#160; he complained&#160; of&#160; cough&#44;&#160; expectoration&#44; fatigue&#44;&#160; and&#160; anorexia&#46;&#160; His&#160; family&#160; history&#160; revealed&#160; that&#160; the&#160; patient&#160; reported as&#160; case&#160; 1 was&#160; his&#160; brother&#46; His&#160; parents had&#160; died&#160; at&#160; an&#160; advanced&#160; age&#44;&#160; and&#160; he had two sisters with type 2 diabetes mellitus&#44; one of them with a history of pulmonary tuberculosis&#46; <br></br><br></br>Based on his personal history&#44;&#160; clinical&#160; signs&#44;&#160; and&#160; renal&#160; function&#160; impairment&#44;&#160; a&#160; renal&#160; biopsy&#160; was&#160; performed&#44; <br></br>which confirmed&#160; the presence of PNG in&#160; the&#160; setting&#160; of&#160; a&#160; systemic&#160; vasculitis associated&#160; to&#160; P-ANCA &#40;positive&#160; anti-MPO&#44; titer 442 U&#47;mL&#41;&#46; <br></br><br></br>DISCUSSION <br></br>Pauci-immune necrotizing glomerulonephritis with extracapillary proliferation&#160; is&#160; the&#160; renal&#160; pathological&#160; expression of systemic vasculitis&#46; This group of diseases is characterized by inflammation&#160; of&#160; small&#160; and&#160; medium-sized <br></br>blood vessels&#44; and includes Wegener&#191;s granulomatosis&#160; &#40;WG&#41;&#44;&#160; microscopic polyangeitis&#160; &#40;MPA&#41;&#44;&#160; Churg-Strauss <br></br>syndrome&#44; or vasculitis&#160; limited&#160; to&#160; the kidney&#46;3 <br></br><br></br>Their etiopathogenesis is unknown&#46; Occurrence of&#160; these diseases&#160; in&#160; several members of a same family has suggested&#160; that genetic&#160; factors could contribute&#160; to&#160; its&#160; occurrence&#46;1 We&#160; report two cases of PNG as a renal manifestation&#160; of&#160; systemic&#160; vasculitis&#160; in&#160; two brothers&#46; In case 2&#44; the disease started when&#160; the&#160; first&#160; patient&#160; had&#160; already died&#46; The presence on the same disease&#160; in&#160; two&#160; brothers&#160; could&#160; support&#160; the genetic component in the etiopathogenesis of vasculitis&#46; <br></br><br></br>Some&#160; researchers have&#160; attempted&#160; to find&#160; associations&#160; of&#160; vasculitis&#160; with HLA genes&#46;1 Recent studies found a positive association with HLA DR1&#44; particularly in patients with WG&#44; and negative&#160; associations&#160; with&#160; HLA DR3&#44; <br></br>particularly&#160; in&#160; Churg-Strauss&#160; granulomatosis and polyarteritis nodosa&#46;1&#44; 4 Our patient&#160; had&#160; the&#160; haplotype A1&#44; B8 B35 Cw4 Cw7 DR3 and DR5 DQ2&#46; Case 1 haplotype&#160; is&#160; unknown&#160; because&#160; the&#160; patient died before the second patient experienced the disease&#46; <br></br><br></br>It has also been suggested that environmental&#160; factors&#160; could&#160; contribute&#160; to disease&#160; development&#160; in&#160; genetically <br></br>predisposed&#160; individuals&#46;2 Patients&#160; reported&#160; here&#160; lived&#160; in&#160; a&#160; rural&#160; environment&#44;&#160; and&#160; some&#160; environmental&#160; component may possibly have contributed to&#160; occurrence&#160; of&#160; the&#160; same&#160; disease&#160; in both patients&#46; <br></br><br></br>In&#160; conclusion&#44;&#160; these&#160; two&#160; cases&#160; of PNG as an expression of systemic vasculitis in two brothers living in a similar environment could support the suggested&#160; hypothesis&#160; of&#160; an&#160; influence&#160; of environmental factors on the etiopathogenesis of vasculitis in genetically predisposed individuals&#46; "
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Genetics and environment: pathogenetic factors of vasculitis?
Genética y ambiente: ¿factores etiopatogéncos de las vasculitis?
MANUEL HERAS BENITOa, MARIA JOSE FERNANDEZ-REYES LUISa, ROSA SANCHEZ HERNANDEZa, ANA SAIZb
a Servicio de Nefrología, Hospital General de Segovia, Segovia, Segovia, España,
b Servicio de Anatomía Patológica, Hospital Ramón y Cajal, Madrid, Madrid, España,
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with&#160; corticosteroids&#160; and oral cyclophosphamide&#46; No renal function&#160; improvement&#160; occurred&#44;&#160; and&#160; renal replacement therapy was required until the patient died in 2003&#46; <br></br><br></br>CASE 2 <br></br>A 72-year-old male&#44; a farmer living in a rural&#160; environment&#46;&#160; In&#160; April&#160; 2004&#160; he complained&#160; of&#160; cough&#44;&#160; expectoration&#44; fatigue&#44;&#160; and&#160; anorexia&#46;&#160; His&#160; family&#160; history&#160; revealed&#160; that&#160; the&#160; patient&#160; reported as&#160; case&#160; 1 was&#160; his&#160; brother&#46; His&#160; parents had&#160; died&#160; at&#160; an&#160; advanced&#160; age&#44;&#160; and&#160; he had two sisters with type 2 diabetes mellitus&#44; one of them with a history of pulmonary tuberculosis&#46; <br></br><br></br>Based on his personal history&#44;&#160; clinical&#160; signs&#44;&#160; and&#160; renal&#160; function&#160; impairment&#44;&#160; a&#160; renal&#160; biopsy&#160; was&#160; performed&#44; <br></br>which confirmed&#160; the presence of PNG in&#160; the&#160; setting&#160; of&#160; a&#160; systemic&#160; vasculitis associated&#160; to&#160; P-ANCA &#40;positive&#160; anti-MPO&#44; titer 442 U&#47;mL&#41;&#46; <br></br><br></br>DISCUSSION <br></br>Pauci-immune necrotizing glomerulonephritis with extracapillary proliferation&#160; is&#160; the&#160; renal&#160; pathological&#160; expression of systemic vasculitis&#46; This group of diseases is characterized by inflammation&#160; of&#160; small&#160; and&#160; medium-sized <br></br>blood vessels&#44; and includes Wegener&#191;s granulomatosis&#160; &#40;WG&#41;&#44;&#160; microscopic polyangeitis&#160; &#40;MPA&#41;&#44;&#160; Churg-Strauss <br></br>syndrome&#44; or vasculitis&#160; limited&#160; to&#160; the kidney&#46;3 <br></br><br></br>Their etiopathogenesis is unknown&#46; Occurrence of&#160; these diseases&#160; in&#160; several members of a same family has suggested&#160; that genetic&#160; factors could contribute&#160; to&#160; its&#160; occurrence&#46;1 We&#160; report two cases of PNG as a renal manifestation&#160; of&#160; systemic&#160; vasculitis&#160; in&#160; two brothers&#46; In case 2&#44; the disease started when&#160; the&#160; first&#160; patient&#160; had&#160; already died&#46; The presence on the same disease&#160; in&#160; two&#160; brothers&#160; could&#160; support&#160; the genetic component in the etiopathogenesis of vasculitis&#46; <br></br><br></br>Some&#160; researchers have&#160; attempted&#160; to find&#160; associations&#160; of&#160; vasculitis&#160; with HLA genes&#46;1 Recent studies found a positive association with HLA DR1&#44; particularly in patients with WG&#44; and negative&#160; associations&#160; with&#160; HLA DR3&#44; <br></br>particularly&#160; in&#160; Churg-Strauss&#160; granulomatosis and polyarteritis nodosa&#46;1&#44; 4 Our patient&#160; had&#160; the&#160; haplotype A1&#44; B8 B35 Cw4 Cw7 DR3 and DR5 DQ2&#46; Case 1 haplotype&#160; is&#160; unknown&#160; because&#160; the&#160; patient died before the second patient experienced the disease&#46; <br></br><br></br>It has also been suggested that environmental&#160; factors&#160; could&#160; contribute&#160; to disease&#160; development&#160; in&#160; genetically <br></br>predisposed&#160; individuals&#46;2 Patients&#160; reported&#160; here&#160; lived&#160; in&#160; a&#160; rural&#160; environment&#44;&#160; and&#160; some&#160; environmental&#160; component may possibly have contributed to&#160; occurrence&#160; of&#160; the&#160; same&#160; disease&#160; in both patients&#46; <br></br><br></br>In&#160; conclusion&#44;&#160; these&#160; two&#160; cases&#160; of PNG as an expression of systemic vasculitis in two brothers living in a similar environment could support the suggested&#160; hypothesis&#160; of&#160; an&#160; influence&#160; of environmental factors on the etiopathogenesis of vasculitis in genetically predisposed individuals&#46; "
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ISSN: 20132514
Original language: English
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