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Query: UMLS:C0029713 (immaturity)
 4,335 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We have developed an animal model for congenital syphilis. Treponema pallidum is injected intravenously into pregnant rabbits and fetuses are infected in utero. As a prelude to characterizing the immunologic consequences of fetal infection, it was necessary to expand on the baseline information about newborn rabbit immune capabilities. Studies were undertaken to determine splenic macrophage and T lymphocyte functions with emphasis on newer immunologic parameters. Newborns aged 2 weeks were compared to adults. Macrophage capabilities in newborn rabbits differed from those of their adult counterparts. These cells produced similar basal levels of interleukin 1 (IL-1) but failed to respond to the IL-1 stimulants of lipopolysaccharide (LPS) or T. pallidum. Macrophages also exhibited diminished levels of la expression and increased levels of prostaglandin E2 (PGE2) secretion. T lymphocyte functions were altered in newborn spleen preparations. Following concanavalin A (Con A) stimulation, interferon gamma production was half that of adults; in direct contrast, IL-2 production was twice that of adults. Con A-induced lymphocyte proliferation was markedly decreased in newborn preparations. This diminished response resulted from down-regulation rather than immaturity. When newborn splenic cells were stimulated with Con A in the presence of indomethacin, anti-transforming growth factor (anti-TGF), or exogenous IL-1/IL-2, better proliferation resulted. PGE2, which is well established as a down-regulator of newborn immune functions in human and mouse systems, also appears to play a role in suppressing newborn rabbit functions. TGF is a potent suppressor of a number of adult immunologic reactions. This is the first documentation of the potential role of this factor in down-regulating newborn immune capabilities. These findings provide a framework for future investigations of our congenital syphilis model.
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PMID:Macrophage and lymphocyte functions are down-regulated in newborn rabbits. 143 51

Three of seven infants afflicted with congenital syphilis at our institution in the past five years showed diffuse pulmonary infiltrates. These persisted long after adequate antibiotic treatment of the primary infection. Review of pathologic literature suggests these infiltrates represent pulmonary immaturity, extramedullary hematopoiesis, and interstitial scarring.
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PMID:Pulmonary changes in congenital syphilis. 174 70

Placental evaluation is important in congenital syphilis (CS) since clinical and serologic findings necessary to fulfill the diagnostic criteria of syphilis may be absent at birth, making early accurate diagnosis difficult. We examined 25 placentas from mothers with syphilis as confirmed by positive RPR rapid plasma reagin and fluorescent treponemal antibody absorption tests to determine which histopathologic features should raise the suspicion of CS. The 25 examined placentas were from 162 syphilitic mothers who delivered at our institution in 1990. Of the 27 infants delivered (including two pairs of twins), four were stillborn and three died at 1 day of age. Eleven of 23 liveborn infants fulfilled the Centers for Disease Control criteria of probable CS. Seven of the 25 placentas showed a well-defined constellation of histopathologic changes that included proliferative vascular changes, chronic villitis, relative villous immaturity, and, in six placentas, acute villitis. All seven of these placentas showed the presence of spirochetes by special stains. Six also had plasma cells in the basal decidua. Recognition of these placental changes, although nondiagnostic, should lead the pathologist to seek additional clinical history and ancillary tests. Placental histopathologic examination is an additional parameter to be considered in the diagnosis of CS.
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PMID:Placental histopathology in syphilis. 831 56

The paper describes the clinical picture and management of congenital syphilis. In the introduction the origin of syphilis is mentioned. The etiologic agent -- Treponema pallidum subsp. pallidum (Tp) -- is transmitted to fetus almost exclusively via placenta. Perinatal infections are less frequent, and postnatal infections are only exceptionally. The symptoms of congenital syphilis may be divided into prenatal (syphilis materno-fetalis), neonatal, and rarely seen postnatal. Prenatal symptoms causing the immaturity of fetus are recognizable from the 7th month of pregnancy and associated with miscarriages, premature deliveries of still-born babies or live neonates with congenital syphilis. Neonatal and postnatal symptoms are manifested only after birth. They may present immediately at birth, develop within first two years of life as early congenital syphilis, or (similarly to acquired syphilis) later in life as a late localized form, often seen many years after birth, even at puberty -- late congenital syphilis. The clinical picture depends on many factors -- primarily on the duration of the infection in mother and the stage of pregnancy.
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PMID:[Issues of congenital syphilis in the past twenty years. II. Clinical picture]. 1664 51